EEVblog #540 - HP35670A DSA Repair - Part 4

[mikerj]

. Can't you just remove and replace all the op-amps and try to see if it works? Surely they can't be that expensive.

Already suggested on page 1 of this thread.  The AD845's are $7 each, and there are a lot of them.

[c4757p]

As well as proprietary chips on the same rails, I believe.

[EEVblog]

Dave, I have done similar to this board and worse without schematics. Can't you just remove and replace all the op-amps and try to see if it works? Surely they can't be that expensive. A vacuum desolder station helps rather than solder-wick. As far as the ASIC/CPLD well you're of course SOL.

They are expensive, but I could socket them and put in cheaper one to test. And yes, if it's not them and it and ASIC or whatever them I'm screwed, the odds of that are high. There is a ton of stuff on that rail that I'm pretty sure went sky high, it could be anything. I've already spent enough time on it, I couldn't be bothered any more.

[Quarlo Klobrigney]

Sorry, I was trying to offer encouragement, not to foster anger or frustration. Maybe at a later date when things cool off you'll try again, or maybe one of the kind intertoob people will provide the unobtainium parts it needs. Either way keep on keepin' on.

[EEVblog]

Sorry, I was trying to offer encouragement, not to foster anger or frustration. Maybe at a later date when things cool off you'll try again, or maybe one of the kind intertoob people will provide the unobtainium parts it needs. Either way keep on keepin' on.

[TheDefpom]

Dave, if you have given up on this, perhaps you could send it my way to have a crack it it?