Author Topic: Midway Games (Read 108789 times)

channelmaniac · « **Reply #100 on:** May 07, 2014, 08:52:34 PM »

Model: Ms Pac Man
Symptom: Dead

Board had attempted repair damage.

Replaced the 4 factory PROMs with broken pins with 4 programmed EPROMs. Replaced 8 bad 2114 DRAMs and their sockets. Tested.

channelmaniac · « **Reply #101 on:** May 07, 2014, 08:52:45 PM »

Model: Pac Man Plus
Symptom: Dead

Board had attempted repair damage.

Repaired gouged trace. The CPU module was bad. Installed a Z80 CPU, 4 program EPROMs, 2 character EPROMs, Color PROM, Video Output PROM, and a Ms Pac Man daughter board to convert game to Ms Pac Man at customer's request.

channelmaniac · « **Reply #102 on:** May 07, 2014, 08:52:59 PM »

Model: NBA Hangtime
Symptom: RAM Errors

Board had physical damage. Straightened bent pins on U32 and removed 2 solder smears from the bottom of the board to fix RAM errors. Reprogrammed U112 to fix a ROM error. Tested.

channelmaniac · « **Reply #103 on:** May 07, 2014, 08:53:31 PM »

Model: Ultimate Mortal Kombat 3
Symptom: RAM Errors

Board had physical damage.

Replaced a bent pin on the PLCC socket for U45. Tested board. Reprogrammed U3, U113, and U132 to fix ROM errors. Tested board.

channelmaniac · « **Reply #104 on:** May 07, 2014, 08:53:47 PM »

Model: Galaga
Symptom: Parts board rebuild

Board had been worked on before and put into a box of parts boards by another tech. Two of the customs on the video board were in wrong sockets, one ROM was in the wrong socket, and the 06XX and 16K SRAM chips were missing.

Installed renew kit - all new sockets & resistor packs. Cleaned custom chip legs. Installed missing ICs. Repaired pins on the 02XX and the 07XX chips on the video board. Board would boot but would fail randomly on start up on different RAM chips. Replaced a bad 74LS138 at 1E on the video board to fix a random memory error on boot. Tested board.

channelmaniac · « **Reply #105 on:** May 07, 2014, 08:53:57 PM »

Model: Galaga
Symptom: Parts board rebuild

Board had been worked on before and put into a box of parts boards by another tech. Four resistor packs were replaced with the wrong type and a 5th had been replaced with the bad, flat style of resistor pack that should not be used on these boards.

Installed renew kit - all new sockets & replaced all old style resistor packs. Cleaned custom chip legs. Repaired pins on 2x 08XX, 51XX, and the 54XX chips on the CPU board. Board would boot but would fail with a 4L RAM error. Replaced a bad 08XX IC on the CPU board and tested.

channelmaniac · « **Reply #106 on:** May 07, 2014, 08:54:07 PM »

Model: Galaga
Symptom: Parts board rebuild

Board had been worked on before and put into a box of parts boards by another tech. Three caps had been replaced incorrectly.

Installed renew kit - all new sockets & replaced all old style resistor packs. Cleaned custom chip legs. Repaired 2 pins on one 08XX IC and replaced 3 incorrect caps - 2 radial and 1 axial that was physically too big. Removed tape from the edge connector and cleaned the residue. Tested board

channelmaniac · « **Reply #107 on:** May 07, 2014, 08:54:20 PM »

Model: Mortal Kombat 4, Revision 2
Symptom: Burnt components next to JAMMA edge conector

Replaced a bad 0 ohm surface mount resistor in the Video Ground circuit. Replaced a bad surface mount cap in the Sync Output and Blue Output circuits. Replaced a bad 33 ohm resistor in the Blue Output circuit. Board powered up but had no sync. Replaced a bad surface mount 7407 IC in the Sync Output circuit and tested the board.

channelmaniac · « **Reply #108 on:** May 07, 2014, 08:54:29 PM »

Model: Mortal Kombat III
Symptom: Dead

Jumpered 1 burnt trace where a coil used to be. Replaced a surface mount coil at L54 in the power circuit for a 74ABT244. Reflowed the DMA Controller at U33 and the Orbit chip at U32. Board booted with WWF instead of MKIII. Replaced all ROMs and the security chip. Tested. Board had graphics corruption. Replaced chip at U45 and retested.

channelmaniac · « **Reply #109 on:** May 07, 2014, 08:54:40 PM »

Model: MKII
Symptom: Reboots at random

Reflowed the surface mount DMA Controller IC. Tested.

channelmaniac · « **Reply #110 on:** May 07, 2014, 08:54:49 PM »

Model: WWF Wrestlemania
Symptom: Random reboots and garbage on screen

Reflowed the DMA Controller IC and fixed bent pins on a custom PLCC. Replaced bad U125. Cleaned battery contacts and tested.

channelmaniac · « **Reply #111 on:** May 07, 2014, 08:55:00 PM »

Model: UMK3
Symptom: Lines under players. Fails self tests showing all Graphics ROMs bad.

Resoldered the CPU and 3 RAMs to fix lines under player issue. Address lines A0-A6 on the Graphics ROMs were not being actrivated during self test. Replaced a bad 74F373 and tested.

channelmaniac · « **Reply #112 on:** May 07, 2014, 08:55:09 PM »

Model: Mortal Kombat 4
Symptom: No video sync

Replaced a dead SMT 74LS07 and a fried zero ohm SMT resistor in the video ground circuit. Tested.

channelmaniac · « **Reply #113 on:** May 07, 2014, 08:55:19 PM »

Model: Mortal Kombat 4
Symptom: No video output

Replaced 3 fried 33 ohm SMT resistors to fix the video output. Replaced a dead SMT 74LS07, a 1K SMT resistor, and a fried zero ohm SMT resistor in the video ground circuit to fix the sync issue. Tested.

channelmaniac · « **Reply #114 on:** May 07, 2014, 08:55:28 PM »

Model: NBA Max Hangtime
Symptom: Missing U36. No sound in game. 10 bongs during self test.

Replaced missing U36. Board would then boot but showed a ROM error. Reprogrammed U132 ROM. Board would boot but fail sound tests with 10 bongs. Replaced cracked SMT coil in the sound circuit. Tested.

channelmaniac · « **Reply #115 on:** May 07, 2014, 08:55:37 PM »

Model: WWF Wrestlemania
Symptom: Bad U14 during self tests

Replaced IC U14. Tested.

channelmaniac · « **Reply #116 on:** May 07, 2014, 08:55:47 PM »

Model: Ms Pac Man
Symptom: Dead

Cleaned the tarnished legs on 3 mask ROMs and corroded legs on 1 EPROM. Tested

channelmaniac · « **Reply #117 on:** May 07, 2014, 08:55:57 PM »

Model: Ms Pac Man
Symptom: Dead. Missing ribbon cable.

Board was part of a bulk buy and had a bootleg Ms Pac daughter board and no ROMs on row 6. Board was also poorly converted to run on DC power.

Removed several jumper wires and repaired a burnt pin on the edge connector. Installed ribbon cable and tested. Fixed broken pin on the sync buss controller chip. Board would still not boot. Replaced bad CPU and successfully tested.

Installed ROMs on row 6 and replaced the bootleg daughter board with an original. Since the bootleg board required no ROMs on row 6, kept that board as a troubleshooting tool for fixing Pac/Ms Pac/Pac Plus boardsets to quickly rule out ROM issues.

channelmaniac · « **Reply #118 on:** May 07, 2014, 08:56:09 PM »

Model: Ms Pac Man
Symptom: Dead

Board would boot if tapped "just right". Replaced sockets on the 74LS259 at 8K, the CPU, and the Z80 Sync Buss Controller. Board booted and worked, but had very thin horizontal lines bridging some text. Replaced the PROM at 4A and tested.

Replaced a bad 2200uf cap and an incorrect 330uf cap where someone used a radial instead of axial. Tested.

channelmaniac · « **Reply #119 on:** May 07, 2014, 08:56:18 PM »

Model: Pac Man
Symptom: Dead

Fixed bent pin 20 on CPU, replaced bad socket on Z80 Sync Buss Controller, and patched one bad trace. Tested.

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Author Topic: Midway Games (Read 108789 times)