New Life Games LLC
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length

News:

Welcome to the NewLifeGames.com message forum! 

 


NLG Site Navigation Menu


Archives of old posts can be found at...... Newlifegames.net/nlg/

Author Topic: SNK Games (Neo Geo MVS/AES)  (Read 124470 times)

0 Members and 1 Guest are viewing this topic.

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #40 on: May 23, 2014, 08:58:10 PM »
Model: MVS MV4
Symptom: Lines in background graphics and audio would cut in & out

Swapped top board out and narrowed problem down to the bottom board. Found a gouged trace between pin 27A on connector CN9 and pin 8 of IC PRO-CT0. Patched trace to fix the graphics problem. Installed an audio cap kit and reset the backup RAM to finish the repair.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #41 on: May 23, 2014, 08:58:24 PM »
Model: MVS MV-4F
Symptom: Lines in background AND foreground graphics. No audio but board would make popping sounds and the screen would flicker with the pops.

Board had strange graphics corruption on foreground and background graphics. This was different than what is normally seen as evenly spaced lines (1 bad line showing up out of every 8 bits across the screen) and instead was like every other line was missing.

Swapped top board out and narrowed problem down to the bottom board. Checked the 74xx245 buffers between the top and bottom board. No problems found. Put the board under the magnifying lamp and found shorted pins from pin 65 to pin 80 (65 through 76 are ground pins anyway) on the NEO-ZMC2 IC at location 11M. Resoldered the pins to fix the graphics problem. Installed an audio cap kit and reset the backup RAM to finish the repair.

It appeared to be leftover solder from when it was factory soldered that finally bridged the trace between pin 79 and 80. There were solder blobs between every pin down that side of the chip but only 79 and 80 appeared to be shorted.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #42 on: May 23, 2014, 08:59:12 PM »
Model: MVS MV-2F
Symptom: Graphics corruption and customer requested an audio cap kit to be installed. Screen looked like line 1 was missing every odd pixel and line 2 was missing every even pixel - repeat all the way down the screen. Some graphics elements were duplicated on the screen in the middle but were garbled and shrunken horizontally. Foreground and background graphics were affected but overlay text & health bars were not. The Neo Geo splash screen was affected but the "Winners don't do drugs" screen was normal.

Board had horrible patch work done to fix some cut traces that was covered with hot glue. I removed and redid the patchwork. They missed 2 traces that needed patching and a couple of the pins were shorting together. I cut the bad part of the traces out so the gouged ends wouldn’t touch each other then resoldered in new wire patches. Resoldered the NEO-B1 and the LSPCA2 ICs to fix the graphics corruption problem and installed the audio cap kit.

The 2 slot board didn’t have any support legs under the slot sockets. I suspect the flexing of the board by inserting and removing cartridges popped the legs loose from the solder pads on the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #43 on: May 23, 2014, 08:59:28 PM »
Model: MVS MV-2F
Symptom: Calendar error

Chip tested good by substitution. Replaced crystal but oscillator would not come up. Chip was in error condition with an output that slowly cycled high-low repeatedly. Checked all inputs/outputs on the chip and they all appeared normal. Checked power to the chip with a multimeter even though the power connections showed logic "high" - the chip power was not at the proper 5.0 volt levels. Jumpered a corroded platethru to fix the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #44 on: May 23, 2014, 08:59:41 PM »
Model: MV-6 (6 slot)
Symptom: Bad Video RAM and graphics corruption

Battery leaked and caused corrosion on the board and it had a Video RAM error at $8000 - Written 5555 Read 5FFF.

Replaced and socketed both CXK5814 ICs to fix the Video RAM error. Removed the battery and cleaned up the corrosion some. The board would work but then had a funky video problem.

This wasn't a normal vertical line through the images type of problem. It looked like horizontal lines through all images. It started with overlay graphics, moved to foreground moving objects and then on to backgrounds. It also got worse as the board heated up.

Resoldered the NEO-B0, PRO-C0, and LSPC surface mount ICs. This helped some but not much.

Running a finger across the board would cause the problem to get worse if you touched the area around the 74HC32 IC at C6. Replaced that IC but it had no effect.

Broke out the component cooler and sprayed the PC board under each chip around the 74HC32 and found that the clock driver IC, a 74LS368 was bad. Spraying it with component cooler immediately fixed the graphics problems until the chip heated up again.

Replaced the chip and played a game of Shock Troopers 2nd Squad.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #45 on: May 23, 2014, 08:59:52 PM »
Model: MVS MV2 (older 2 slot)
Symptom: Lines in foreground (player) AND background objects

On the 2 slot Neo Geo boards the NEO-257 ICs are the 2 to 1 multiplexer ICs that choose which slot to get the graphics data from. There are 3 of them on the board. If one of these is bad then there will be lines in the graphics elements they are selecting. Top left is background graphics, bottom left is player graphics, and the one on the right side is for text and other overlaid objects.

Replaced both of the left side NEO-257 ICs and the corruption was still there. Logic probe showed that the data was coming in and exiting the NEO-257 ICs correctly but I thought that maybe they were garbling the data. Nope. Problem still there.

Did some further tracing down to where the data goes to the NEO-C0 chip. It flows from the 257s through the ZMC2 IC and then on to the C0 chip.

Replaced the NEO-ZMC2 IC and tested the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #46 on: May 23, 2014, 09:00:29 PM »
Board: MVS MV4
Symptom: Click of Death

Board was stuck in watchdog reset and had battery corrosion damage. Board already had wire jumpers already on it to fix a crosshatch of death problem.

Cleaned the corrosion as best possible. Checked the control lines on the Backup RAM and Work RAM. They were stuck high meaning the chips weren't being accessed. Checked the enable line (pin 20) on the BIOS and it was stuck high. There was a problem in the decode or read/write circuitry. Checked around the chips near the battery for traces eaten by corrosion. Found pin 9 on the 74LS05 at location D11 had a bad trace connecting to pin 5 of the 74LS259 at location C5. Ran a jumper to fix the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #47 on: May 23, 2014, 09:00:39 PM »
Model: MVS MV4
Symptom: lines in graphics and sound problems on top board

Swapped top boards out to narrow problem to the top board. Lines in the graphics were NOT the same for all 4 slots. Slot 4 was perfect. Slot 3 had 2 repeating vertical lines. Slot 2 had a single repeating vertical line. Slot 1 had every other vertical line missing. All slots had the same sound problems: missing tunes, incorrect tunes, and garbled sound effects.

Found 3 bad traces in the sound circuitry between the board connector CN11 and the buffer/latch chips. Fixed at trace between pin 4 of R6, L6, G6, and C6 and pin 5A of CN11. Fixed a trace between 6B of CN11 and pin 3 of S6, M6, H6, and D6. Fixed a trace between 12B of CN11 and pin 9 of S6, M6, H6, and D6. Tested all 4 slots and sound was working fine.

Checked slot 3 and found 2 bad traces in the area between the slot and the 4 to 1 data selector IC (74F253) at A7 and at B7. Ran a jumper from pin 4 of A7 to cartridge connector CTRG5, pin 33A and a jumper from pin 4 of B7 to CTRG5, pin 34A to fix the graphics problem on slot 3.

Checked slot 2 and found a nasty looking signal on pin 11 of the 4 to 1 data selector IC at C1 (74F253). Checked continuity to pin 20B of CTRG3 and found it good. Looked closely at the pin on the cartridge slot and found slight corrosion. Cleaned the pin and the slot tested good.

Slot 1 had a bad trace between pin 46 of CTRG1 and pin 10 of P7 (74F253). Jumpered the trace and tested the slot.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #48 on: May 23, 2014, 09:00:50 PM »
Model: MV2
Symptom: Backup RAM Error

Board would get to the green screen then reboot. This was a constant repeating cycle. Flipped all the dip switches to run the system through a Backup RAM test. It gave a Backup RAM error with the message Written: 5555 Read: B240

(The B240 error is stuff of legend over on the Neo-Geo.com forums.)

Checked the Backup RAM with a logic probe and found pin 20 (CS*) was dead on both. Traced it back to the 74HC32 and back to the battery backup circuit. Traces were good. The resistors and diodes in that section were good. Checked the C1815 transistor with an ohmmeter and it was OPEN from collector to emitter. Replaced the transistor and the board booted right up.

I have to say this is the first time I've seen an open transistor that wasn't blown in pieces. I think the corrosion from the battery must've traveled up the legs and into the body of the transistor and caused it.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #49 on: May 23, 2014, 09:01:06 PM »
Model: MV2F
Symptom: Missing audio from right channel after 5 minutes

This board was traded in as a "dead" board purchased off of eBay towards the repair of another board. Found 1 penny in the bottom of the box and found another two pennies and a dime wedged in the memory card slot. Removed the coins, straightened the pins and tested the board. Fixed the audio problem by recapping the audio section.

Replaced the memory card connector with one from a parts board to finish the repair. The original 2 slot arcade cabinet is set up to where the player can insert a memory card to save games. Apparently someone shoved coins in this slot.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #50 on: May 23, 2014, 09:01:17 PM »
Model MV4FT2 (The 3rd, newest, and smallest verison of the 4 slot)
Symptom: Carts would not work in slots 1 and 2. No audio.

Strange thing was that you could put carts in 3 or 4... or 3 and 4 and it would work. Put a cart in slot 2 or slot 1 and you would get a crosshatch. Put a cart in 2, 3, and 4 then all three slots were usable. Put carts in all slots and the board would constantly reboot after doing self tests.

Repaired a bad trace between Slot 1 and 2, pin 13B on the program board connector and IC 1A, a NEO-244, pin 38. This was the program data line D8. Now all four slots would run cartridges.

The audio problem was tough to track down. The audio test worked so the bottom board was at least generating audio from the diagnostics.

Swapped the NEO-244 IC at A2. Nothing. Traced down all the connections between the slots and the NEO chips and then the NEO chips to the CN9 connector. Then traced it from the CN9 connector on the bottom board back through the 74xx logic to the 2610 Yamaha chip. Everything tested good.

Frustrated, I cleared the backup RAM and the sound magically returned. AAAAAAAAAAAAAHHHHHH!!!!!
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #51 on: May 23, 2014, 09:01:28 PM »
Model: MV1
Symptom: Backup RAM Error

Board was giving Backup RAM Error: Written 5555 Read 7255

Battery leaked on the board. Checked the traces to the Backup RAM. They tested good. Removed the battery, cleaned the corrosion, patched 2 bad traces from the NEO-F0 IC to the DIP switches, and replaced the Backup RAM at H6.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #52 on: May 23, 2014, 09:01:40 PM »
Model: MV1
Troubleshooting RAM Problems

When troubleshooting RAM Problems on the MV1 the error message (Read 7255) can be broken down into upper bits (72) and lower bits (55)

The bits are kept in RAM as follows:

Backup RAM: Upper H6, Lower H5
Work RAM: Upper G3, Lower G4

The rest of the ICs will get filled in as I troubleshoot other boards.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #53 on: May 23, 2014, 09:01:51 PM »
Model: MV1C
Symptom: No video sync

Board had no video sync. There is a 470 ohm SMT resistor tying the sync line high then a 100 ohm SMT resistor inline with a 74HC32 surface mount IC. The IC had inputs but the output was stuck high. Replaced the IC and the 100 ohm surface mount resistor.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #54 on: May 23, 2014, 09:02:05 PM »
Model: MVS - MV2F
Symptom: Lines in player graphics and some background graphics for slot 2.

Logic probe showed pin 20 on the ZMC2 chip stuck high when a cart was being accessed in slot 2. Checked pin 9 on the NEO-257 at H/J2 and it was stuck high. Checked pin 16 and it had garbage for the inputs. Checked the trace from the NEO-257 to the slot and it was good. Replaced the NEO-257 IC to fix the board as its inputs were damaged.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #55 on: May 23, 2014, 09:02:14 PM »
Model: Bootleg MV1C
Symptom: Plays for a couple of minutes then starts glitching

Board would get horizontal streaks on the display. Would get worse as game was played. Pushing on the SMT chips had no effect. Power cycled game and it worked again but played slower and the sounds were played slower as well then started streaking more and more until it lost sync and died. Resoldered the main video IC and system clock driver IC to no effect. No clock signal was coming from the 24MHz crystal. Checked the 1M and 100 ohm resistors and the 2 caps connected to the crystal. Checked soldering on the system clock driver IC. All checked good. Replaced the crystal and played a few games.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #56 on: May 23, 2014, 09:02:24 PM »
Model: Bootleg MV1C
Symptom: Missing BIOS.

Burned a replacement BIOS ROM. Board booted and played but had no sound. Replaced missing sound pot and fixed a bad trace.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #57 on: May 23, 2014, 09:02:37 PM »
Model: MV-1F
Symptom: Requires separate coin mechs for player 1 and player 2.

Unit had a 2 slot BIOS in it. (usa_2slt.bin) Replaced it with the standard USA BIOS (neo-geo.rom image) and played a couple of games to test.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #58 on: May 23, 2014, 09:02:48 PM »
Model: MV4FS
Symptom: Dead. Had a note taped to it that there were lines in the graphics.

Unit was missing the BIOS chip. Programmed a replacement chip (27C1024) and booted it. It had lines in the graphics and was missing sounds. Board had been repaired before and had many chips replaced on upper and lower boards.  It also had a dark liquid spill on the top board.

Checked all the previous trace repairs. Reset the Backup RAM to fix the sound issue. Cleaned the top board and the slot connectors to fix the lines in the graphics. Reassembled the board and replaced all the missing standoffs, screws, and mounting feet.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: SNK Games (Neo Geo MVS/AES)
« Reply #59 on: May 23, 2014, 09:03:00 PM »
Model: MV4
Symptom: Dead. Click of death.

Bottom board had severe corrosion damage on the platethru holes and was beyond economical repair. Contacted customer and swapped out the bottom board with one that was already repaired. Slot 1, 2, and 3 had lines through the graphics and if a cart in slot 1 was bumped the board would reset. Cleaned the top boad and slots thoroughly to fix slots 2/3. Replaced the slot 1 connectors with ones pulled from a parts board to finish the repair. (No new ones are available.)

Customer reported the boardset was 300 feet from the ocean at an arcade which would explain the corrosion damage.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

Cell Phone and Pad Mode

imode wap wap2

NLG Archives

Archives @ newlifegames.net Wayback Machine

Contact Us

NLG Shop 928 754-4147 Email Us 1788 Highway 95 30 BHC City AZ 86442
If you find this site helpful, please consider becoming a Contributing NLG Member with a monthly subscription to help cover the cost of pizza, coffee, aspirin, hosting, and bandwidth.
Contributing Members: get unlimited personal messages, can save topics and replies as drafts,
can post to the Classified ads, get unlimited access to the downloads, and also get this minty badge:



**Subscription Link** (Click Here) **Subscription Link**



           
If you would rather remain anonymous Thank You or just want to help support the site, please use this "make a donation" button:




From your entire NLG staff, thank you for supporting NLG.


New Life Games LLC 1788 HIGHWAY 95 UNIT 30 BULLHEAD CITY AZ 86442




Newlifegames.com     Newlifegames.net     Newlifegames.org

Newlifegame.com     Newlifegame.net     Newlifegame.org    Newlifegames.us

   New Life Games     NewLifeGames  NLG

 We Bring new Life to old Games    1-888-NLG-SLOTS

Are all Copyright and Trademarks of New Life Games LLC 1992 - 2022


FAIR USE NOTICE:



This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner.
We make such material available in an effort to advance awareness and understanding of the issues involved.
We believe this constitutes a fair use of any such copyrighted material as provided for in section 107 of the US Copyright Law.
In accordance with Title 17 U.S.C. Section 107, the material on this site is distributed without profit to those
who have expressed a prior interest in receiving the included information for research and educational purposes.

For more information please visit: http://www.law.cornell.edu/uscode/17/107.shtml
If you wish to use copyrighted material from this site for purposes of your own that go beyond fair use,
you must obtain permission directly from the copyright owner.




The NewLifeGames.com website is optimized for use with Firefox and a minimum screen resolution of 1600 x 900 pixels.

SimplePortal 2.3.5 © 2008-2012, SimplePortal