Before I toss these on the basis of bad panels...

[craigc15]

I thought I'd post some pix here to get some feedback.

The Toshiba 52" seems to be a common problem. I replaced the t-con w/no success.
I replaced the main/t-con board on the Samsung 32" with no success.
I also replaced the main and t-con boards on the RCA with no success. The distorted video moves with the "No Signal" box.
I haven't replaced anything on the Samsung Monitor yet.

Has anyone had success repairing display driver boards?

Thank you!

Craig

[tom66]

Re: Before I toss these on the basis of bad panels...

Panel, Panel, Panel/Main, Panel/Main/PSU (bad caps if SyncMaster T24x series)

You cannot replace the driver boards and besides there's little to no point. They only serve to connect the T-con to the tab bonds. Just like a connection block.

[craigc15]

Re: Before I toss these on the basis of bad panels...

The monitor is a SyncMaster T240HD.
What capacitor(s) are problematic?
Thanks!

[tom66]

Re: Before I toss these on the basis of bad panels...

All of them. Crappy Samwha or Capxon usually bulge.

[craigc15]

Re: Before I toss these on the basis of bad panels...

On the PS, or main board, or both?

Thanks!

[bmadbob]

Re: Before I toss these on the basis of bad panels...

Craig, I have been playing with some of these Toshiba's. What I have been finding is the tab to screen bonding is not making a good connection sometimes. I have taken like a wide paint scraper, set it on the tab and put it up against the LCD screen so it doesn't get to hot, take hot air solder gun and run it over a few times, hold down on the scraper while it cools. Sometimes it's the small IC in the middle of the tab that has to be resolder. I had some that stayed working and some lasted a couple of months. Just a thought if you wanted to try something.

[craigc15]

Re: Before I toss these on the basis of bad panels...

Thanks for the reply.
I noticed on the ribbon cable going to the portion of the screen that is not working has a "damaged" trace. I considered attempting to repair it with a piece of wire, but my experience is that those ribbon cables can not handle being soldered.

[craigc15]

Re: Before I toss these on the basis of bad panels...

I checked the PS and Main boards for Samwha or Capxon caps and there aren't any.
The PS has Sam Young caps, none are bulging. The PS voltages are good and there is no unusual AC ripple on any of them.
The main board has all SMD caps with no manufacturer printed on them. None of them are bulging either. I checked the ESR on all and they seem fine.

Anything else, or is it a bad panel?

I'll check the continuity of the LVDS cable tomorrow.

It would be a real shame to have to toss this monitor. It is in like new condition.

[cashkennedy]

Re: Before I toss these on the basis of bad panels...

One lady drove a broken t240hd to me at her cost and gave it to me for free after I responded to her craigslist listing for it / apparently she wanted it gone now!. I took it apart and the LVDS was loose that was all > best monitor ive ever spend 0 money for. For me though the upper 2/3 of the screen would go black and the lower 1/3 would freeze... but either way shows the lvds cable is a pretty weak point on these / probably related to the fact that Samsung uses no screws in these / everything taped / notched together...

[bmadbob]

Re: Before I toss these on the basis of bad panels...

Craig, I guess I shouldn't use the term re-solder. All I did was heat them up again so they would reseat themselves, like a bad solder joint. Sorry not the greatest at explaining things.