Lw3 vuk coil locked help needed

(Topic ID: 217271)

Lw3 vuk coil locked help needed


By Chochi_ca

61 days ago



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  • 62 posts
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  • Latest reply 4 days ago by wayout440
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There are 62 posts in this topic. You are on page 2 of 2.
#51 21 days ago

Replaced my 7408 chip. Still not gettin enough voltage on my high/low inputs for the vuk gate?

#52 21 days ago
Quoted from Chochi_ca:

Replaced my 7408 chip. Still not gettin enough voltage on my high/low inputs for the vuk gate?

Do you mean high/low inputs to the 7408? If so, check the outputs of 5F 6821 PIA, that is all there is before the 7408. If that's not what you mean, I am not clear about your question.

2 weeks later
#53 6 days ago

So back at it again. I replaced the 5f 6821 pia. But while I was desoldering the old chip I burnt away the trace points for pin 38 and pin 2. I can’t c the traces on the board to c where they go? Can someone please tell me what points they go to from there. I am unable to read the print. Now upon start up my machine does not boot properly.

#54 6 days ago
Quoted from Chochi_ca:

So back at it again. I replaced the 5f 6821 pia. But while I was desoldering the old chip I burnt away the trace points for pin 38 and pin 2. I can’t c the traces on the board to c where they go? Can someone please tell me what points they go to from there. I am unable to read the print. Now upon start up my machine does not boot properly.

Ugh. Looking at the schematics, you should be able to jumper pin 5f pin 38 to 6821 11D pin 38, both of these are IRQA low signals. Looks like pin 2 is not used, so you should be ok with leaving that be.

#55 5 days ago

K I jumped that along with a couple others that had no continuity. I was able to understand the numbering and trace the rest. But is pin23(cs2) run? That’s the only trace I can’t can’t read where it goes?

#56 5 days ago

Sorry and pin 19..... ugh.

#57 5 days ago

Pin 23 signal name "2100" runs from LS139 8E pin 5 (CPU sheet 1 of 4, right side of page about halfway down)
Pin 19 signal name "EN" runs to 7402 12B pin 8 (CPU sheet 1 of 4, signal enters about halfway down on the left, ends up about the middle of the page)

#58 4 days ago

K both those were good. But now my machine boots up and 5v and pia light stay lit. Does not boot. I placed a jumper btw pin 38 5f and pin 38 11d also. Is this correct? So pins 37 and 38 have continuity on both chips? Irqa and irqb.

#59 4 days ago

Yes, pins 37 & 38 of both PIAs should have continuity to each other, and all four pins (37 & 38 of each PIA) should have continuity to LS08 7E pin 9.

#60 4 days ago

Those points all test good. I have checked all points btw both pias and there good. What would cause my machine not to boot? Only the 5v and pia leds stay solid on boot up? Apreciate all the help. Maybe I should order a new rottendog mpu board? Damn it didnt wanna shell out the price of a new board.

#61 4 days ago

The machine booted properly before the replacement of 5f pia

#62 4 days ago

*most likely* something went wrong with the replacement.
Check and solder all vias on both top and bottom. Make sure there are no shorts between IC legs unless there are intentional traces between them.

Was this a new IC? Not something used that could be questionable. Keep in mind that new IC can be DOA ( a slim chance, but it happens). ICs can also be damaged by ESD, excessive heat from soldering, or mechanical stresses to the legs.

If it wasn't any of those, then the failure is coincidence, and you'll have to troubleshoot it as a new problem.

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