PCB Repair Logs Commando
Commando
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| PCB Image | Reserved |
|---|---|
| Pin Out | Reserved |
Repairer: VectorGlow
Forum Thread: Commando PCB Repair
Symptom: Very ‘snowy’ video
Cure: Bad output on pin 12 of the LS273 at location 4B of the smaller top board
Symptom: When powered on the copyright text appears (ie 'typed') too fast and the static attract screens are cycled through too fast, sometimes with text and or sprites missing, and sometimes with text added (see Diagnosis for more info)
Diagnosis: However, when inserting a coin the 'CREDIT 00' text either doesn't appear or doesn't count up as the board is coined up - sometimes an audible sound is played to indicate a coin up, but sometimes not. Either way, the coin ups ARE recognised (as the game WILL start).
Also, when coined up, the screen saying to press 1 or 2 player startdoes NOT appear.
On pressing the coin up button then player 1 or 2 start, the game starts and plays perfectly. No problems with sound, graphics, etc.
All EPROMs are fine.
Cure: Replaced LS74 at 6M on centre board (chip had bad outputs)
