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Author Topic: Commodore (VIC-20, 64, and 128) Computers  (Read 13677 times)

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Offline channelmaniac

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Commodore (VIC-20, 64, and 128) Computers
« on: May 04, 2014, 08:18:40 PM »
Model: Commodore 64
Symptom: Boots normally but all text on screen flashes with random colors

Replace the PLA IC, part # 906114-01 (a.k.a. 82S100). It controls the color RAM (2114 SRAM) access.

If the screen looked normal with the exception of some wrong colored areas of the screen then replace the 2114 SRAM IC.
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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #1 on: May 04, 2014, 08:18:59 PM »
Model: C64
Symptom: Dead, blank screen.

Reset line was stuck low. Found a short between the 7406 IC and the metalized cardboard RFI shield. Attached a thin piece of posterboard to the shield with double-stick tape and trimmed the pin on the IC.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #2 on: May 04, 2014, 08:19:18 PM »
Model: C64
Symptom: Dead. Blank screen.

Found multiple machines with this symptom: Replaced bad VIC II chip on one, replaced a bad PLA chip on another, Replaced a bad 74LS629. Could also be caused by a defective crystal. PLA chip is the most common suspect.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #3 on: May 04, 2014, 08:19:36 PM »
Model: C64
Symptom: Screen & border showing, but no text

Ran into different causes of this. One machine had a defective 4164 RAM IC, another machine had a defective PLA, and another a bad Character ROM. PLA is the most common cause for this.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #4 on: May 04, 2014, 08:19:51 PM »
Model: C64/VIC-20
Symptom: Missing keys when typing

Commonly this is caused by dirty switches on the keyboard. If it is a single key or multiple keys that aren't in a pattern, then press them repeatedly for a few minutes to let the self wiping contacts clean the switch. If the keys are in a row or column then replace a defective 6526 CIA chip on the C64 or a 6522 VIA chip on the VIC-20.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #5 on: May 04, 2014, 08:20:01 PM »
Model: C64
Symptom: Will not read/write to/from the serial port

Replaced a bad 6526 CIA IC and tested with diagnostics.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #6 on: May 04, 2014, 08:20:20 PM »
Model: C64
Symptom: Missing audio channels, stuck sounds, or no audio

Replace the defective 6581 SID chip. In rare cases of no audio at all it may be the 906114-01 PLA IC. (It is a custom programmed 82S100 chip)
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #7 on: May 04, 2014, 08:20:32 PM »
Model: VIC-20
Symptom: No audio, missing sounds, or stuck audio

Replace the 6560 VIC IC. This IC does both audio and video functions.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #8 on: May 04, 2014, 08:20:44 PM »
Model: C64
Symptom: Multiple RAM errors

If a machine has more than 1 bad RAM chip (4164) or comes back for another repair of yet another defective RAM chip then replace the external power supply. They are known for deteriorating and blowing RAM chips on the computer. They are potted and not repairable. Luckily they can be easily found.
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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #9 on: May 04, 2014, 08:20:57 PM »
Model: SX-64
Symptoms: Dead. Drive light stuck on.

This one was a bugger. It had liquid spill damage.

Replaced the corroded cartridge slot, 2 40 pin sockets, 1 24-pin socket, and 2 28-pin sockets. Cleaned the pins on the VIC-II chip. Replaced a bad CPU, PLA, SID (would work, but had no white noise channel), 74LS08, 74LS06, 74LS139, 74LS258, 2x 74LS257, and 8 DRAMs (2 were bad, but went ahead and replaced them all.)

Replaced a bad 901229-05 ROM on the disk controller board to fix the drive light issue.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #10 on: May 04, 2014, 08:21:22 PM »
Model: 64
Symptom: Dead. Garbage on screen.

The board was sent with symptoms described as "Blank blue screen."

When put on the bench it would throw garbage on the screen - a lot of @ symbols and some were flickering. The well calibrated finger found one of the DRAM chips was shorted and getting hot.

Socketed and Replaced the DRAM chip then got the reported blank blue screen. Tried a diagnostic cart to see if it would “play blind” but it wouldn’t. This ruled out a character ROM issue.

Tried a Music Composer cartridge and it tried to start it but couldn’t. The screen went garbled on graphics mode. This pointed to a PLA chip problem. Socketed and replaced the PLA then ran diagnostic loops on the board.

Informed the customer that frying DRAM chips is a pointer that the power supply may be dying.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #11 on: May 04, 2014, 08:21:35 PM »
Model: C64
Symptom: Dead, black screen

Replaced a bad 901225-01 ROM. Board failed audio tests. Replaced bad SID and ran diagnostics in a loop to burn in unit.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #12 on: May 04, 2014, 08:21:48 PM »
Model: C64
Symptom: Dead, Black screen

Replaced bad PLA chip and ran extended diagnostic loops to burn the unit in.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #13 on: May 04, 2014, 08:22:03 PM »
Model: C64C
Symptom: Reports incorrect RAM count

When running diagnostics the RAM errors are random and sometimes showing Address Bus errors.

Replaced 2 4464 DRAM. No change. Replaced the 251715-01 custom IC to repair board. Ran extended diagnostic loops to burn in board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #14 on: May 04, 2014, 08:22:17 PM »
Model: C64
Symptom: Totally blue screen on monitor

Background and foreground were all one solid blue color. Replaced the VIC-II (6567) chip and ran diagnostics in a loop to burn in unit.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #15 on: May 04, 2014, 08:22:32 PM »
Model: C64
Symptom: "Bad RAM 7"

Removed and socketed the RAM chips. Replaced 1 bad RAM and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #16 on: June 20, 2015, 09:27:07 PM »
Model: Commodore 64
Symptom: Dead. Black screen.

Replaced bad 6567 VIC-II video controller IC and looped diagnostics to burn in the board.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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  • Few things are better than fixing an old game...
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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #17 on: January 29, 2017, 06:41:04 PM »
Model: Commodore 128
Symptom: Dead

Fixed a bent pin and resocketed the IC at U68. Checked the RAMs and the /RAS was missing from one bank and the /CAS from both. Traced it backwards through the circuits and discovered that the main CPU wasn't initializing the MMU because the data buss line D3 was garbled. Checked continuity and found D3 was missing connectivity to the ROMs and the CIA chip on the left side of the board. Found corrosion next to a ROM socket that broke connectivity for D3 and had damaged the traces for D4 and D5. Patched the 3 data buss lines with 30-ga Kynar wire and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #18 on: May 23, 2017, 09:09:23 PM »
Model: Commodore 64
Symptom: Dead

Replaced a defective 7701 clock generator IC and booted a diagnostics cartridge. System came up with flashing colors on text, CIA errors, and vertical lines on screen. Reseated the CIA chips and the character ROM to fix those issues and replaced a bad PLA to fix the flashing colors. System would randomly fail the Color RAM test with an Address Error. Replaced the 2114 Color RAM IC to fix that error and left the computer looping diagnostics for burn in.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

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Re: Commodore (VIC-20, 64, and 128) Computers
« Reply #19 on: May 27, 2017, 09:19:37 AM »
Model: Commodore 64
Symptom: Dead

Replaced defective 906114 PLA and tested
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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