cookertron wrote on 2023-07-04, 10:05:

Some of the pins on the TMUs were bent and touching and there were a couple of capacitors missing too which I've replaced (see Voodoo 2 - STB BlackMagic 3D (PICS ADDED)) However the problem persists.

You are also missing C60 and possibly C61 on the front side, near the "PRODUCT OF MEXICO" sticker. Looks like whatever ripped off C60 took one pad with it, but the via seems to be there so some wire repair shouldn't be too difficult.
With all those parts missing I'd suggest going over the entire PCB looking for missing parts, cracked solder and bent pins first, before reflowing. Also, unless the stickers are paper and you really care about them, washing and drying the card.

Deunan wrote on 2023-07-04, 12:50:

cookertron wrote on 2023-07-04, 10:05:

Some of the pins on the TMUs were bent and touching and there were a couple of capacitors missing too which I've replaced (see Voodoo 2 - STB BlackMagic 3D (PICS ADDED)) However the problem persists.

You are also missing C60 and possibly C61 on the front side, near the "PRODUCT OF MEXICO" sticker. Looks like whatever ripped off C60 took one pad with it, but the via seems to be there so some wire repair shouldn't be too difficult.
With all those parts missing I'd suggest going over the entire PCB looking for missing parts, cracked solder and bent pins first, before reflowing. Also, unless the stickers are paper and you really care about them, washing and drying the card.

Oh ****, how did I miss those? Thanks for that!

Any idea what the values might be? I've got a bunch of 100nf caps

cookertron wrote on 2023-07-04, 12:57:

Any idea what the values might be? I've got a bunch of 100nf caps

C60 was an electrolytic cap judging by the outline. Probably something like C59? I can't see the markings but I would guess 10uF / 16V.

EDIT: And now that I looked at it again, C50 near the end of edge connector also looks bent or half-ripped off. C49 and C51 below are suspicious too, but it could be just a light reflection. As I've said, go over the entire PCB with a magnifying glass and look at everything. Especially things that stick out and could be ripped off, and the dense chip pins in case some are bent.

Deunan wrote on 2023-07-04, 13:19:

cookertron wrote on 2023-07-04, 12:57:

Any idea what the values might be? I've got a bunch of 100nf caps

C60 was an electrolytic cap judging by the outline. Probably something like C59? I can't see the markings but I would guess 10uF / 16V.

EDIT: And now that I looked at it again, C50 near the end of edge connector also looks bent or half-ripped off. C49 and C51 below are suspicious too, but it could be just a light reflection. As I've said, go over the entire PCB with a magnifying glass and look at everything. Especially things that stick out and could be ripped off, and the dense chip pins in case some are bent.

I have an Andostar AdD407 which is why I'm surprised I missed them. Then again I was concentrating on the TMUs, DAC and memory chips.

Thanks for the info, quite a bit to be getting on with 😊

Deunan wrote on 2023-07-04, 13:19:

C60 was an electrolytic cap judging by the outline. Probably something like C59? I can't see the markings but I would guess 10uF / 16V.

EDIT: And now that I looked at it again, C50 near the end of edge connector also looks bent or half-ripped off. C49 and C51 below are suspicious too, but it could be just a light reflection. As I've said, go over the entire PCB with a magnifying glass and look at everything. Especially things that stick out and could be ripped off, and the dense chip pins in case some are bent.

I've put the card back under the microscope and checked the areas you pointed out. It looks to me as though 61 and 62 are meant to be voided whereas 60 has definitely seen better days. Hopefully I'll be able to use that via to make contact with the replacement cap.

Some of these not populated caps are probably power filtering (the usual ceramic 100nF or so) but omitted due to cost-cutting. So make sure any electrolytic caps you replace are low ESR or even polymer type.