Pannes possibles par composant

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Socket	Name	Chip	Replacement	Type	Failure
U1	CIA	906108-02 (6526)		DIP40	Startup screen normal, but no cursor. No keyboard or control port access but cartridge works. Partial failure: some keys or joystickpositions don't work, one character appears ahead of startup cursor or random characters appear at startup. Blank screen if chip is shorted (remove to check) and chip may get hot to the touch.
U2	CIA	906108-02 (6526)		DIP40	Startup screen normal. No serial or user port access. "File not found" error when drive accessed. Cartridge works. Characters may show as blocks on startup screen.
U3	BASIC ROM	901226-01	EPROM 2764 8KB	DIP24	Blank screen w/ border. Cartridge works.
U4	KERNAL ROM	901227-03 (early -02)	EPROM 2764 8KB	DIP24	Blank screen, no border. Most cartridges don't work but a few game carts (example: CBM Kickman and Jupiter Lander) will work with a normal screen because they bypass the Kernal ROM.
U5	CHARACTER ROM	901225-01	EPROM 2732 4KB	DIP24	Normal startup border, but "garbage" characters where startup page characters should be. Cartridge works.
U6	COLOR RAM	2114 SRAM		DIP24	Startup screen shows flickering characters with shimmering colors. Check also PLA U17.
U7	MPU	906107-01 (6510)		DIP40	Blank screen, no border. Cartridge doesn't work.
U8	LOGIC CHIP	7406		DIP14	Blank screen. Partial failure: drive access problems: drive resets but "device not present" error.
U9-U12	RAM CHIPS	generic 4164 DRAM	generic 4164 DRAM	DIP16	Blank screen, no border. Shorted chips will get warmer than the other RAM chips. Partial failure: will sometimes produce "garbage" screen, abnormal number of bytes free or "out of memory" error on startup screen.
U21-U24	RAM CHIPS	generic 4164 DRAM	generic 4164 DRAM	DIP16	Blank screen, no border. Shorted chips will get warmer than the other RAM chips. Partial failure: will sometimes produce "garbage" screen, abnormal number of bytes free or "out of memory" error on startup screen.
U13	LOGIC CHIP	74LS257APC or AN or A but not PC (7708)		DIP20	Blank screen, less than 38911 bytes free at startup or "garbage" screen. See U25 Note: MOS77xx series chips have a high failure rate.
U14	LOGIC CHIP	74LS258 (7709)			Blank screen or "garbage" screen, even with diagnostic cart. If IC is MOS 77xx type, they are a frequent failure item!
U15	LOGIC CHIP	74LS139			Blank screen
U16	generic CMOS quad bilateral switch	CD4066			Color problems such as random color "checkerboard" pattern on screen or no color.
U17	PLA	906114-01	PLAnkton, PLAtinum...		Blank screen, no border. It can produce colored screen or flashing color garbage instead of startup screen. It can cause intermittant loss of cursor, screen freeze and/or program crashes after warmup and it can put random characters on screen. This chip normally runs hot. It is the most common chip to fail in the C64 because it runs hot normally, like the SID.
U18	SID	906112-01 (6581)	SwinSID		Normal screen. No sound or garbled sound. Mouse or graphics tablet pointer stuck or jitters. If shorted, can cause blank or "garbage" screen. NOTE: computer will work without a SID plugged in (unplug to check). This chip normally runs hot. Check also capacitor C13 (open).
U19	VIC	906109-04 (6567/6569)			Blank screen (may be light or dark) with no border. Sometimes will produce garbage or "checkerboard" screen, or screen that lacks contrast. If screen is blank or garbled from bad VIC, "blind" disk commands from keyboard may still work.
U20	LOGIC/TIMER	556			(generates computer and drive reset at powerup). Blank screen. Computer will not reset, or RESTORE doesn't work. If disk drive is held in reset, check buffer transistor Q3 for shorts (later C64 boards only, early boards don't buffer reset line)
U25	74LS257APC or AN or A but not PC	Logic			Blank screen, "garbage" screen or less than 38911 bytes at startup. See U13 Note: MOS77xx series chips have a high failure rate.
U26	Logic	74LS373			"Startup screen has normal border, but characters are scrambled."
U27	Logic	74LS08 (or MOS7712)			Normal startup border, but screen full (or nearly) of "garbage" characters.
U28	Quad bilateral switch	CD4066			Normal startup screen. Proportional mouse or graphics tablet doesn't work in one or both control (joystick) ports.
U29	Logic, Divider	74LS74			Startup screen shows normal characters in multicolored "rainbow"
U30	Logic, Counter	74LS193
U31	Msster OSC	74LS629N or 7701/8701			Blank white screen, no border. Normal "whine" in nearby AM radio will be missing if the oscillator is not running. Check also VIC U19
U32	Logic CMOS	4044			No monitor picture, just diagonal lines on screen.