Sony KDL52W3000 right half blurs

[steves7839]

I bought this TV to fix, suspecting a bad backlight tube. On closer inspection the entire right third of the picture is smeared and motion blurred. The dark band in the center is not vertical as I would expect from a dark backlight.
Would you experienced troubleshooters suggest a possible cause and troubleshooting sequence?.

[freakaftr8]

Re: Sony KDL52W3000 right half blurs

That's a tab bonding issue. Furthest on the top right. You have to take the TV apart and take the plastic frame off around the screen. Remove the metal bezel surrounding the panel in on the top of the panel will be ribbon cables going into it flex the top right one and see if it disappears.

[CapLeaker]

Re: Sony KDL52W3000 right half blurs

Try flexing or squeezing the frame.

[steves7839]

Re: Sony KDL52W3000 right half blurs

I released both ribbons from the T-Con board, cleaned and swapped. No change. I'm not sure how to proceed. I can separate the bezel enough to see that the tab bonds are inside a metal cover around the panel, with no obvious way to access.
If I remove the bezel, will I see tab bond connections from the front?

[budm]

Re: Sony KDL52W3000 right half blurs

You need to remove the metal frame from the LCD panel to see the tabs.
I.E.:
https://www.badcaps.net/forum/showth...ht=tab+bonding
https://www.badcaps.net/forum/showth...ht=tab+bonding
https://www.badcaps.net/forum/showth...ht=tab+bonding

[steves7839]

Re: Sony KDL52W3000 right half blurs

The symptom did not react to pressure on the tab bonds.
I got a good picture by bending out one corner of the LCD panel ever so slightly. It stayed good for a few hours. The next time I powered the set on the symptom was back.
So now the challenge is to keep the LCD "bent". I plan to shop for some heat-conductive pad I read about on this forum and try it.

[steves7839]

Re: Sony KDL52W3000 right half blurs

Here's a photo of an improvised plastic shim which maintains a little twist on the LCD panel. This seems to keep the picture good for several hours so far. I'm shopping for thermal transfer pad tomorrow. How thick should I aim for? It's sold in .5mm, 1.0mm and 1.5mm thicknesses.

[budm]

Re: Sony KDL52W3000 right half blurs

This what I use:
https://www.badcaps.net/forum/showpo...33&postcount=7

[saddle_au]

Re: Sony KDL52W3000 right half blurs

Almost every Sony I've seen, its the chip on the tab that is not connecting properly, not surprising, they get very hot when running. I've measured them with a non-contact laser thermometer when the frame was off. I have to press the chip onto the tab from top and bottom using spaces under the metal frame and above the plastic frame to cure this. The tab bond to the PCB or panel seems to not be the culprit around these parts unless the pcb has been wet and corrosion has damaged it.

I would like to try reapplyng heat to reseat the chip, but haven't been game enough on working TVs to attempt this yet. I have sat down a couple of times and designed one that presses hard and is able to be heated using a silicone barbacue pad to separate the pressing bit, the heat source and the tab. Might try it on the next 37inch that comes in (said that a couple of times now though).

Currently have eight 47inch Sonys downstairs ready to do this fix on (cheap buys), but need real horizontal space (about three times the screen size) and an hour or so for each to do this. They've been backing up since August, I've procastinated too much thinging about the alternative fix method.

[steves7839]

Re: Sony KDL52W3000 right half blurs

I did touch the panel end of the rightmost tab to find it blistering hot. Is the chip you mention on the inner side of that tab? Would it help to shim the panel end of the tab with thermal pad BudM mentioned? I'm not seeing the chip.... guessing its on the backside of the panel, which is now held into the frame by gravity. (The chassis is leaning upright against a wall to save floor space.) Is it safe to flip up the entire panel from the bottom edge to look at the panel backside, or do I risk tearing tabs loose?

Thanks for your responses!

[saddle_au]

Re: Sony KDL52W3000 right half blurs

The chip is on the plastic tab between the pcb and the panel. It just looks like a long thin shard of metal like a thinck flattened out small headless, pointless nail.

Yes, I've seen that chip really hot when it has failed, usually meaning a panel failure ie: short. Try some pressure on the chip to see if the connection is bad, but normally once the chip is blisteringly hot, the bad connection to the tab or a short fault in the panel has caused it to fail. Running the panel like this may now cause failures in the supply to the chip from the TCON.

If this is the only TV you have, you don't want it as parts and what the heck, its going in the bin, try some extreme pressure on the chip pinning it between the metal carrier and the plastic carrier. Use an insulator on the lower half to protect the plastic side (like shims of the thick cotton floor slides you use under furniture) and something that will do thermal transfer to the outside metal. I've been using barbeque silicone sheeting with some success (the non-ribbed stuff they sell that you cook on to keep the cooking off the barbeque surface). It's not bad at heat transfer and it's a good insulator (under fets as well).

[steves7839]

Re: Sony KDL52W3000 right half blurs

The side tabs each have a rectangular "squashed nail" inside. These side tabs extend from the panel about a centimeter and stay cool. Squeezing them has no effect.

The chips that get hot are on the inside of the upper tabs that bond to the two panel interface PCB's. They each look like flattened graphite, and they all get equally (very) hot as soon as the TV screen powers on.

Would you suggest I compress each of these graphite-looking structures in the tabs between two layers of heat conductive material?

Thanks, Steve

[SteveNielsen]

Re: Sony KDL52W3000 right half blurs

Can you post some pics of the graphite-looking things?

[steves7839]

Re: Sony KDL52W3000 right half blurs

Can you post some pics of the graphite-looking things?

Sure.

Pic 1 is the upper row of tab bonds between panel and interface PCB's.

Pic 2 is the rightmost tab bond showing the "chip" matrix that gets hot. All tabs along this upper row get blistering hot; I found this the hard way.

Pic 3 is one of the side tabs, an extension of the LCD panel. Each side tab contains a "flattened nail" structure described by poster saddle_au.

It appears that the metal guard around the tab bonds is positioned to remove some heat from these hot "chip" structures, but there's no heat transfer material to facilitate this.