Viewsonic VT2430 fluctuating 5V rail

[R_J]

Re: Viewsonic VT2430 fluctuating 5V rail

The reason I asked about what the final fix was is that you did not mention that you changed any caps in your first post, So that's why trouble shooting took the path it did.

Had we known caps. were changed on the main board, and then the throbbing led fault occurred I'm sure this could have been repaired a lot quicker.
That why if you replace parts and the fault is now different, go back and check what you did first, sometimes it is a very simple mistake that's overlooked, we have all done it.

I remember having to repair electronics from other shops and it was a good thing they never used flux remover, the first part of trouble shooting was to see what the previous person did, repair that and then fix the original fault.

[rddube]

Re: Viewsonic VT2430 fluctuating 5V rail

Well I did replace those 3 caps you suggested C101, C108 and C110 which were 1500uf, so I thought that maybe the others smaller 10uf were a problem. I checked the ESR and they were all over 4 ohms, and that is when I changed a few.

Maybe that fixed it, but I also created a short on C218 which was the main culprit for our subsequent problems. I agree, I should have checked my soldering on that one but didn't.

Anyhow it is fixed now, and tomorrow I will be recapping the entire power supply with better brand caps, and then it will be put back into service!