It appears you are dealing with a challenging issue with the TV screen. Let's break down the problem and run through some diagnostic steps together.
1. By examining the pictures you provided of the TV's screen, there seem to be vertical lines that suggest a connection issue with the display panel or a fault within the panel itself.
2. You mentioned testing both T-CON (Timing Control) flats, but the problem persisted. This indicates that the T-CON board might not be the cause of the issue, or the replacement T-CON board has the same issue as the original one.
3. The photos of the T-CON board and the flat connectors show no visible physical damage, but problems like these can also be due to micro-level failures or issues that aren't visible to the naked eye.
4. The label on the back of the TV indicates that it's a SCHONTECH model with a specific serial number. This can be helpful if you need to order parts specific to this model.
5. It's important to verify that the flat connectors are correctly seated, and there are no bent pins or dirty contacts. Be sure to handle these connectors gently as they are delicate and can be damaged easily.
6. Inspect the panel's ribbon cables that connect to the T-CON board for any signs of damage or wear.
7. If the T-CON board and connectors seem to be in good condition, the issue might be with the LCD/LED panel itself, which would be more difficult and costly to replace.
If you have access to an oscilloscope, you could probe the signals going to the display panel to ensure they are consistent and within the expected range. Also, checking the power supply voltages to the T-CON board and ensuring they are stable could rule out power issues.
Because the problem persisted after the T-CON flats were tested, and assuming they were known-good replacements, it might be worth considering the panel or mainboard as potential sources of the issue.
Before proceeding with parts replacement, especially with something as expensive as the panel, I would recommend a thorough inspection of all ribbon cables, connectors, and a check for any cold solder joints or failing components on the T-CON board and mainboard.
If you have the ability to source parts, a swap with a known-good mainboard could help isolate whether the T-CON or the mainboard is at fault. If the issue persists with a new mainboard, it is likely that the panel itself is defective.
I hope this helps guide your troubleshooting process. Let me know if there are any specific tests you've conducted or if there's additional information you can provide.
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