Tron is down... SOS!

slseed1969

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Donor 2016
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I'm looking for some advice from the Tron gurus out there. I did something stupid today. I have two board sets. One was working great (up until today) and the other was stuck in a watchdog loop with garbage graphics on the screen.

I was trying to fix the bad board set and was tracing through the schematic. I found that a few of the data lines on the 6116 RAM chip were staying low so I first tried swapping the RAM chip with the known good one from my other set. No problems with the RAM on the first set, but the second set was still resetting. So I moved on further into the circuit and thought the issue was the LS245 at F3, so I replaced it with a new one. Still no luck with the reset. The next thing may have been my fatal mistake.

I traced back in the circuit and was seeing incorrect outputs on the pins of the custom chip at E3. I also noticed that the chip on the bad board set was pretty hot, so I took a chance and swapped the one on my good board since I didn't have a spare. This didn't fix my problem and after swapping the chip back my good boards started to reset loop with garbage on the screen.

Have I screwed myself my swapping the custom chip? Is there a way I can test if it's bad or not? If the chip was bad what could it have damaged on my good board set?

Any help is appreciated.
 
if you plugged the custom in upside down, its toasted. A bad custom won't kill anything else on the pcb.
But, from looking at your pcb, you've dicked something else up, the cpu isn't communicating with the eproms properly, but, that's really hard to tell for sure whats going on without having it in hand to poke and prod at.
 
Thanks cdjump. I'm pretty sure I was careful with the direction I plugged in the chip, but I was working on the board for hours and was getting tired. I'll do a thorough inspection of the whole board with fresh eyes. I really didn't mess with any other chips on the board other than the RAM and custom chip besides probing some of the chips. I suppose it's possible I shorted out some pins.

If I can't figure it out, are you available to repair it (them)?
 
yes, i repair them. Send me a pm if you need it repaired.
 
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