Difference between revisions of "PCB Repair Logs Wonderboy Bootleg"
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Revision as of 08:49, 30 August 2012
Wonderboy (Bootleg)
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| PCB Image | Wonderboy Bootleg PCB |
|---|---|
| Pin Out | Reserved |
Repairer: kane
Forum Thread: Wonderboy (Bootleg) PCB Repair
This Wonder Boy bootleg came with a cabinet I bought a while ago and was fully working when I got it.
One day while playing, the game backgrounds started to flicker on and off and eventually disappeared altogether. I shelved it for a while, but got stuck into it now I have some time over Christmas.
The three ROMs with the orange labels contain the background tiles, and they read ok, so the fault was going to be a bad TTL or RAM. All the RAM seemed OK, but found a 74LS157 with an output stuck low on a daughter board just left of those ROMs.
Replacing the 157 brought all the backgrounds back.
