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Asteroids No Boot / asteroids not booting

Repair of:	Asteroids(Atari 1979)
Repair Type:	PCB
Status:	Fixed
Contributed by:	notxyshy
Symptom: P1 & P2 volcano LED solid. Speaker buzz. Main PCB LED illuminated. No display, spotkiller LED sometimes on or dim. 5.05v could be measured at A/R with max adjustment of pot. Measurement at 5v TP on main board was 4.95. Chips were warm, no watchdog loop. All edge connectors & wires had good continuity. Noticed c5 clip mod was present. Not relevant to repair solution. Getting to the point. Even though DC voltages were okay measured at the A/R board, AC test of big blue indicated presence of 3VAC.

Solution: Big blue was original, manufactured 1978. Replaced with new. Board now boots , responds to input, plays all sounds, p1 & p2 have good blink. Screen has display and spot killer is off, but horizontal collapse is present ("G05-801").

Other Repair Logs

These repair logs are related to this repair log.

Title

Symptom

Solution

Status

Asteroids No Boot / asteroids not booting

P1 & P2 volcano LED solid.
Speaker buzz.
Main PCB LED illuminated.
No display, spotkiller LED sometimes on or dim.

5.05v could be measured at A/R with max adjustment of pot.
Measurement at 5v TP on main board was 4.95.
Chips were warm, no watchdog loop.
All edge connectors & wires had good continuity.
Noticed c5 clip mod was present. Not relevant to repair solution.

Getting to the point. Even though DC voltages were okay measured at the A/R board, AC test of big blue indicated presence of 3VAC.

Big blue was original, manufactured 1978. Replaced with new.

Board now boots , responds to input, plays all sounds, p1 & p2 have good blink. Screen has display and spot killer is off, but horizontal collapse is present ("G05-801").

Unknown

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