Received this one in from one of my arcade customers. Once I got it, it looked very familiar – I had recently repaired a Kung Fu Master for another arcade. Turns out the edge connector is completely compatible (for how I do testing – I think the coin counters were different pins)

Board #1 – Received Condition

The board arrived with a reported garbled screen. On first power-up, the game ran overnight without any issues appearing. Did a drop test the next day and the board failed.

Repairs

• Performed full board maintenance: cleaned all chips, which had significant oxidation and dirt buildup, and applied Deoxit contact cleaner throughout.
• During cleaning, the color ROM was found to be physically disintegrating. This component decodes color data for the graphics, and its failure would have caused missing or incorrect colors on screen.

I like to do the chip cleaning in my office – I can usually do it while catching up on YouTube Videos.

This is the color PROM – it was pretty much disintegrated in the socket it was in.. I tried to save it, but it really was too far gone at this point.. I had replaced 6 legs and still it wasn’t really reliable. We got a new PROM burned.

During an extended burn-in test, an ROM chip failed, causing the motion object graphics to scramble. Programmed and installed a replacement ROM chip.

Hunted around to correct this one for a while – at first it looked like a counter or some addressing issue. But the EPROM was completely scrambled.. I compared to a new burn and it wasn’t even close.

After replacing both the color ROM and the failed ROM chip, the board passed a full test cycle and completed the shop checklist.

Board Works!