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Taito F3

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grobda View Drop Down
"Look at the size of that thing!"

Joined: 04 Aug 2010
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    Posted: 09 Jun 2019 at 10:10am
F3 motherboard with popn'pop cart was playing but with missing green, corrupt tile graphics and no sound.

Missing green was traced back to filter caps and found no continuity between filter cap and edge - despite looking intact the track must have corroded. Patched this and green returned.

Took cart cover off and found missing address lines to one of the sprite roms. Again corroded tracks, so patched these. Tiles looked a little better but were still corrupt. Continued to trace missing signals and patch them - many tracks on this cart had corroded. After a few hours tracing broken tracks around the board the graphics were finally good.

The sound was a similar problem. The sound chip crashed immediately due to broken tracks for multiple data pins. Most of these were in the bottom left corner of the pcb. Patched all these plus a few other bad tracks (mostly to the sound PLD - F3 seems to use PLDs for different rom configurations rather than the jumpers that neo carts and system 16 etc. use). Sound eventually returned. 

An unusual and time-consuming repair - no visible damage or bad chips but pretty severe track rot. Must have taken about 6 hours all in chasing tracks through via's, under and over the board - often coming up underneath rom chips. Tracing, patching, testing, repeat. Cheered when it finally worked.

Pic below showing the mess of patch wires along with IC numbers etc. Might try converting the game to something I want to play, and tidy up some of the patches along the way;

Partial pinout of C and D connectors I made while finding which tracks were bad;

sporadically obsessed with this sh*t
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