Repair a QLED tv. Same process as a normal led TV?

[edugimeno]

Hi! I'm tempted to purchase a "broken, as is" Samsung 50q60t tv on sale.
Seller states "we were watching TV and it went to black with only audio, then it went into constant reboot mode"
Maybe only a led strip replacement is enough but I need to take the risk.
From the little information I've been able to find, looks like these QLED tvs are different inside:

• Are led strips available online and at reasonable prices too?
• Is disassembly the same procedure as led TV? I've managed to swap led strips up to 50" with no issues on normal led tvs
• Any special tool required? I've seen videos of people using heat gun and other stuff...

Thanks in advance!!

[Biruslapio]

QLED is marketing garbage by samsung, it's an LCD, some have blue LED backlight with some yellow filter, but that's it, they may have the screen glued to the bezel which would make backlight repair very "fun".
Reboot seems like screen fault, common for T 2020/ A 2021 series.

[edugimeno]

Thanks Biruslapio, after posting this question I found some other posts and videos and it looks like my chances are:
-D001 or D002 ESD protection diode block, can be removed safely as many reported
-Internal short in LCD, which seems to be "repairable" with the masking method, assuming some quality loss

I haven't disassembled this TV yet.

Thanks!

[EazyBone]

Don't buy it. Reboot for Samsung means a panel problem or the line to panel. Basically it's effed. Rare chances people have fixed them. Stay away

Reboot is not backlights it's panel. And yes repair of lights on these tvs are a nightmare. If even that was true. I took several apart just for parts and it was impossible without breaking something. It can be done id say but not worth the time. Again it ain't the backlight if it's rebooting it's the panel

[edugimeno]

Don't buy it. Reboot for Samsung means a panel problem or the line to panel. Basically it's effed. Rare chances people have fixed them. Stay away

Reboot is not backlights it's panel. And yes repair of lights on these tvs are a nightmare. If even that was true. I took several apart just for parts and it was impossible without breaking something. It can be done id say but not worth the time. Again it ain't the backlight if it's rebooting it's the panel

Too late, it's already on my desk LOL
I will probably take a look at it next weekend

[nomoresonys]

Suppose it could be a firmware issue.

[edugimeno]

Ok after watching dozens of videos of people with the exact same TV and same problem and being able to fix them with the LVDS cable taping methid, I went to my town home where I have this TV.
I disassembled it (a little hard if you don't know, they don't have screws and the plessure tabs are very firm)
Tried with the main board socket disconnected. All backlight went on full brightness, no reboots. So PS is good
Plug main to PS again and unplugged LVDS output from main. TV went on, full BL at first, then dimmed light, and stable, of course no image but it woudn't reboot
Than I reconnected LVDS and took out the flex that joins left to right side of panel. Nothing changed, so the issue must be on the right side of the panel (the one where the LVDS directly plugs in, the left one uses the intermediate flex)
So I started the tape "method" in the main LVDS cable. It didn't affect at all when taping the left half pins, seems that those are driven to the left side panel which is good
Then I started taping the right side of LVDS with different widths of tape and at different positions. I spent over an hour moving tape left and right, and using half, double...all sizes. I was able to see a litttle of everything:

• Nothing at all, but would boot
• single discontinous line
• some random horizontal lines
• some random horizontal and vertical lines, very erratic

After all this time I wansn't able to get anything close to a recognisable image. Should I keep trying? Should I give up assuming the panel is too damaged?

Thanks!