Arcade Collecting > Restorations & repair
Star Wars - fully working!
Spyridon:
--- Quote from: Level42 on May 08, 2009, 02:23:58 am ---Run the board and measure each pin on both DACs. See if there are some really off values between the same pins.
--- End quote ---
1 lead on ground, 1 lead on the pin to measure?
Level42:
Correct sir. :D
ChadTower:
Get some scrap PCBs and practice your soldering. Anyone doing PCB repair, especially at the IC level, needs to be able to do this. Find an old VCR or something and desolder a bunch of stuff until you're comfortable with it. Then you can desolder those chips, solder in sockets, and have the ability to swap them in and out. If you use good sockets you won't have an issue with them failing later.
If you can get a decent AVG chip and swap it in. That's your AVG test.
The DACs you would want to remove, socket, and swap. If the problem follows one chip you know which is bad. If nothing changes odds are they're both good. Do the same with the OP Amps.
Level42:
I'm pretty good at soldering, but my method is cutting the legs when I remove a chip. There's no way he's going to get those DACs out in one piece and not burn the tracks....
Just MHO and my experience.
ChadTower:
--- Quote from: Level42 on May 08, 2009, 11:17:36 am ---I'm pretty good at soldering, but my method is cutting the legs when I remove a chip. There's no way he's going to get those DACs out in one piece and not burn the tracks....
Just MHO and my experience.
--- End quote ---
I can do it and I've only been soldering a couple of years. Caution is definitely the priority here, though. If he's not confident about it have someone else do it. But there's no call for cutting out chips as debugging.
Good use of flux, clean it off with alcohol, an iron at about 700-720, a narrow shaft screwdriver tip, and good efficient suction will get it done.
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