A3000 Screen Issues (Amber?)

[giZmo350]

I was hoping to get NTSC 640x400x16 (interlaced) working with the built in deinterlacer, but it's having issues.

I know I have some issues with Denise.. it doesn't sit really well in the socket (there was lots of battery corrosion I had to clean up and maybe I cleaned up too well). I have to press on her sometimes to get her to seat correctly. But no amount of pressing/adjustment has improved the screen beyond this point.

You could admit defeat and send it to Acill :lol:

You might pull the motherboard out completely and go over all the traces, component connections, solder joints... etc. with a fine tooth comb. After that, an O'scope might come in handy.

BTW dude... Never, ever, ever sell or lose your PCD-50B!!!

[giZmo350]

I think I will do that.. I noticed looking at the schematics that U480 and U477 are real close to the battery.. so there may have been some corrosion issues there.

After first receiving my A2000HD I had many boot problems immediately and had to remove the battery ASAP that the PO left in to corrode. The corrosion traveled up and around the CPU socket. I cleaned everything real good and it cured the problems but, about once a year I still have to pull the MB as the green fuzzies continue to attack the CPU socket. I'll bet even right now that if I disable the 060 lib and pull my Blizz board the computer won't boot. I was j/k about sending to Acill but I know that what I really need to do is replace the CPU socket and again clean and "seal" the surrounding area.  

After you pull the board, you may be able to show some progress as inspection and cleaning proceed and you should be able to fire up and test the MB out of the case.

Also, FYI, I use these interdental brushes to clean any mild corrosion from behind & between IC pins. Run the brush lengthwise behind IC socket and IC pins and also between to break any corrosion bridge. Use some IPA or %100 percent alcohol with the bruch if desired. Also have some high pressure canned air (or other air source) to blow out any particles.

Little brushes look like this.....



There are different techniques between using logic probes, O'scopes & DVMs... mostly the differentiation being power applied to the board and no power to the board. A good DVM in "beep" mode can really help test (w/o power) continuity not to mention you can reverse the polarity of the leads to test low voltage caps & will be able to hear them charge and discharge without having to lift to test. Of course, aging PSU filter caps can cause a heap of trouble on the MB but are tested by isolating them first.

Take pics along the way and keep us informed.