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LCD Screen blinks on & Off at start up up-to about 10 minutes

I have a Gericom 19'' flat panel LCD monitor. When I first start the computer the screen and led light keeps blinking, also picture comes on and off. I did try it on other computer same result. After about 10 minute I get the picture on the screen. Also sometime after 2 or 3 reboots everything is normal until I shut off the computer. May be after about an hour if i try to restart the computer same problem however it takes less time perhaps 2 or 3 minutes for the screen to be normal.
I have read a lot of post mentioning Capacitors, looking at PCU I can not seen any blown capacitor. I did notice some brown stuff on a round coil like (about 1cm round copper wired, says 125° on it) object.
There are about 20 odd capacitors on PCU, i have no idea which ones needs replacing.

I would be grateful for any help?

HP

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  • H P Mar 04, 2009

    Thanks louie12fix,



    I did take picture the picture of the board before dismantling it. The components I was referring in my previous post, I just found out is inductor with 125° written on it.



    I have 10 X 200 uf 16V capacitors on the board, there are about 5 X 100uf on & and rest i think they are 47uf all 16V. there is one 10uf 24v on the circuit. There are no bulging on any of them so not sure which one to replace. i am looking for dry shoulder on the both boards.

    Once again thanks for you help.

    HP

  • H P Mar 04, 2009

    Sorry correction i have 10 X 220uf 16V capacitor on board

  • H P Mar 09, 2009

    After reading lots of solution for the problem I was having. I manage to fix the monitor. I replace 10 X UF 220 capacitors & changed 2 of UF100 capacitors. I had 5 in total of UF100 could not be bothered to do the three in the row, right next to each other, as I figured it would be much more difficult to do so. I did have problem treading capacitors legs trough. I ended up using safety pin to tread a hole, which was much easier. It took me about 3 hours. Now I have a monitor which is good as new.



    Thanks to all.

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Hemante, you should look for electrolytic verticle can type capacitors whose tops are not flat but slightly swollen. Also check all the soldering for COLD or THERMALLY FRACTURED solder joints on the bottom of the inverter board that powers the CCF tubes. Be sure to replace caps with only 105degC caps. NOT 85degC!!! If you have digital cam take pictures before you tear apart monitor. this way you can get it back together correctly. Hope this Helps. Good Luck!

I'm louie12fix on fixya or lmistyrel @ aol.com




















Posted on Mar 04, 2009

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