PCB Repair Logs TMNT Turtles In Time

TMNT - Turtles In Time

TMNT - Turtles In Time

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Repairer: Arcade King
Forum Thread: TMNT - Turtles In Time PCB Repair

I bought this board via Supremicus on AA. Looking at the pics he put up of the game running it had some vertical lines running through the character graphics which 95% of the time is a common mask rom crapped out fault.

Problem: Vertical lines through the character graphics not evenly spaced.
Fix: Doing the usual mask rom test sure enough roms 7K (4 megabit) and 7L (8 megabit) came up BAD. I've fixed quite a number of Konami board with bad mask roms so I removed the roms and put sockets in ready to replace them. Burn't some new roms, popped them in and ....still ****ed...WTF? Reading the original roms they both came up good. ****!

Pushing down on top of the custom at 3J the graphics came good. Found 2 lifted pins (see pic) board now works 100% and passes the mask rom test.



Ahh well live and learn. I'm so use to replacing bad mask roms on these things you start bypassing all the basic fault finding. No biggy the roms are bound to fail eventually.

On TMNT Turtles in Time, Burra sent me over another one to have a look at. I've attached a pic of the 2 boards. You can see the top one which is burra's is full of POS F(Fujitsu) IC's and the bottom one has good quality Hitachi which you dont see too often on Konami stuff.



Unfortunately I was unable to fix Burra's board because the Protection IC @ 7H is faulty. The thing was dead when I first got it but I found 5 bad F chips and a bad ram @ 1J. The thing boots up to the "RAM ROM TEST" then freezes. Some times it will get into the test but it constantly gives you random bad ram faults. It got as far as the cross hatch a few times. A real shame too I think TMNT 2 is the only PCB to use this crappy protection chip.

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