jit
Deep Blooper
Posts: 8
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Post by jit on Dec 28, 2021 11:51:27 GMT
Hello,
I bought a Duo that was working about 2 months ago. It had not been recapped. I wanted to test it again before recapping it but it's no more working. I cleaned up the board with alcool, changed all caps, but the board is not even powering-up.
I'm using the same power adapter that was working: 9v 1A
I checked the use
I checked both voltage regulators and they give 5v.
IC108 and IC502 seemed to have cold solders, so I did a reflow job on them.
But still, the board does not power up. However, there are some things I'm wondering about : - I checked the voltage on the red LED, and it shows 4.98v on one leg and 4.2v on the other leg... Is it normal to have voltage on both legs ? I thought that one leg should be the ground, no ? - during the recap, I had a problem with C679 and C678 : the tracks of the positive leg has been damaged. From what I saw, the positive leg of C679 can go directly to R694 and the positive leg of C678 can go directly to R693. Am I right ?
Is there something else I could check ?
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jit
Deep Blooper
Posts: 8
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Post by jit on Dec 28, 2021 23:06:00 GMT
OK forget me, my bad. The cable I have had some oxidation on the video connector (the yellow one). The console was and is still working, I just have to clean the video connector or to buy a new cable 😁
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Post by dshadoff on Dec 28, 2021 23:15:49 GMT
Oh, the video cables had a lot of problems, especially at the DIN connection to the console. Be careful about that. Does anybody know where to get better quality cables these days ?
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keithcourage
Punkic Cyborg
https://www.facebook.com/turbografxfan/
Posts: 231
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Post by keithcourage on Jan 2, 2022 14:26:56 GMT
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