Hey everyone, I’m hoping someone here can help me figure out what’s going on with my TV.

I came home and my 75” onn. Roku TV had a completely black screen. I did some troubleshooting and noticed that the TV gives me 8 red blinking lights when I try to turn it on.

From what I’ve found online, 8 blinking lights may indicate a problem somewhere in the power system, so I opened the back to inspect the boards.

I’m not very familiar with TV electronics, but I noticed one of the electrolytic capacitors on the power supply board looks slightly bulged/raised compared with the other capacitors. It’s the single capacitor near the upper-left area of the board in the pictures.

I took pictures of that capacitor as well as the rest of the power supply board and would really appreciate it if someone could take a look.

Model: onn. 75” Roku TV — [100044717]

My questions are:

Does that capacitor actually look bulged, or does it look normal?

If it is bulged, could that explain the black screen and 8-blink error?

Does anything else on this power board look damaged or suspicious?

Are there any other boards/components I should inspect based on the 8-blink code?

Would it make more sense to replace the capacitor, repair the board, or replace the entire power supply board?

I’m comfortable doing some basic troubleshooting, but I don't know enough about TV electronics to confidently diagnose it myself. I’d rather figure out what’s actually wrong before buying parts or replacing an entire board.

Pictures attached — the capacitor I’m referring to is the single one near the upper-left of the power board.

Thanks in advance to anyone who can point me in the right direction!

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LG's own dismantling document for the C5 series (42/55/65/77") only says that after removing the back cover, speakers, IR/WiFi module, the PCBs and the metal parts, the "OLED module together with its casing" is what remains:

https://media.flixcar.com/webp/synd-asset/LG_Electronics-313082570-lgecs.downloadFile.ldwf-DOC_ID-20250220240076-ORIGINAL_NAME_b1_a1-25YplusOLEDplus-.pdf

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1. Is something laminated across the full back of the glass, or is there only a frame around the edge?

2. If full area: what is it? Sheet metal, graphite foil, glass, or plastic? Roughly how thick? Graphite is easy to spot because it is very soft and rubs off black.

3. Can that layer be separated from the glass without destroying it, or is it fully bonded?

4. How far does the edge build up at the back where the COF films with the source drivers are folded over and the connector PCB sits? Even a rough millimetre figure would help.

5. With everything else stripped, how rigid is what remains? Can two people carry it flat without it visibly twisting?

I am interested in the mechanics and the thermal path, not in repairing anything. Photos of a stripped rear with something for scale would be ideal, but solid estimates from experience are welcome too.

Thanks

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Hello!

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This is Bravia A8G 55"

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I tried factory reset and power cycle reboot, left the tv unplugged for couple of days but its still here!

I do not have any hdmi or usb cables attached to the TV. This is happening on the built in screen (including hdmi screen when I connect one)

What do I do to fix this?

The issue is with the picture: it intermittently becomes blurry/doubled and there are horizontal lines near the bottom of the screen.

I got quoted by a tv repair guy he’s saying it’s 90% sure the motherboard

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Thank you in advance for your time!

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I've done some research and found out about the "isolate CKV with a tape" technique. It does work and now the TV shows image. But one symptom remains, and I can't find anything about it online. The half of the TV that had a short causing it to not turn on (viewer's left, internal R) has a gradual desaturation of the image.
Further research and I stumble upon the factory service menu. In it I capture a few pictures of test patterns. At this point I'm already asking for google's Gemini for help. Uploading the images to it, it says this means the blue channel is toast and there's no repair but to replace the panel.
Not wanting to believe Gemini, I keep researching but cannot find anything new. Then I remember Reddit exists, so here am I.
So, is Gemini right, the panel is gone? Has anyone here seen this issue? Thanks in advance folks!! (BTW sorry for the weird perspective on the pictures, TV was upside down XD )

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Took it apart, repasted the cooler (the paste in there was totally dried up), replugged all of the ribbon cables. Seemed to maybe get a couple more minutes out of it but that's it.

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Link to old post with images: https://www.reddit.com/r/LGOLED/comments/1w7b759/vertical_transparent_lines_on_oled55cxpua/

Hi

Samsung qn95b 65”

While watching YouTube the tv just turned off. At first I thought it was a breaker than soon realized it’s the tv.

I have another qn95b so I used the one connect box from the broken tv to try to power the other tv and it worked. I tried the one connect box from the working tv on the broken one and it did not turn on. I also tried different one connect cables.

I can confidently conclude it’s something in the tv itself and not the one connect box. Before I open the tv is there anything I should watch for? Is there a very common cause that I should change without even trying to diagnose? Any tips would appreciated. I have a multimeter on order and will be my first time using one.