PCB Repair Logs Wonderboy Bootleg

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Wonderboy (Bootleg)

Wonderboy (Bootleg)
Marquee wonderboy.jpg
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.

Pcb wonderboy bootleg 1.jpg

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.

Pcb wonderboy bootleg 2.jpg

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.

Pcb wonderboy bootleg 3.jpg

Replacing the 157 brought all the backgrounds back.

Pcb wonderboy bootleg 4.jpg




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