Apr 102018
 

My beloved original pcb developed once again problems after the last repair log you can read here:

Psychic 5 repair log

This time, the overall colour palette was pinked and all text was missing

After some troubleshooting I found again a problem with a Fujitsu ttl 74ls08, same type and week/year of manufacturing of the one I changed on the old repair log!

 

After changing it, the game worked fine for some minutes and then it developed a new problem

 

Game lost sync and became bluish

Again I decided to concentrate on the only Fujitsu  74ls08 ttls which were present on the board until I found the faulty one.

Same week/year of manufacturing and same fault: dead outputs

In addition, I found another couple of Fujitsu 74ls08 which had dead outputs  and I decided to change all of them with good ones.

Now the game is 100% fixed but there are 3 more Fujitsu ttl waiting to be replaced. I ran out of parts otherwise I would have changed them immediately.

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