Q80 TV Screen Flashing when One Connect Box Overheat

It's likely that heat-sensitive components within the One Connect Box are causing the screen flashing issue. Overheating can affect various electronic components, including transistors, capacitors, and integrated circuits. To narrow down the cause, you could try the following steps:

1. Ventilation: Ensure that the One Connect Box has proper ventilation and isn't placed in an enclosed space that restricts airflow. This could help prevent overheating in the first place.

2. Cleaning: Dust and debris can accumulate within the box and contribute to overheating. Gently clean the interior of the One Connect Box to remove any dust buildup.

3. Inspect Components: Visually inspect the components on the circuit board for any signs of damage, such as bulging capacitors or burnt areas. Pay special attention to components near areas where heat might accumulate.

4. Thermal Paste: If applicable, check if any components require thermal paste for proper heat dissipation. Over time, thermal paste can dry out and lose its effectiveness.

5. Testing: If you're comfortable with electronics, you can use a non-contact infrared thermometer to identify hotspots on the circuit board. This might help you pinpoint which components are generating excessive heat.

6. Replacement: If you identify specific components that are overheating, you may need to replace them. This could involve soldering skills and access to replacement parts.

7. Professional Help: If you're not comfortable with electronics repair, it's best to consult a professional technician who can diagnose and fix the issue safely.

Remember to unplug the One Connect Box before attempting any repairs or inspections, and exercise caution when working with electronics.

I have a similar problem, Q7FN from 2018. In my case, the TV gets to a reboot loop after 30minutes/1hour. I am from Brazil so room temperature here is pretty high (30-35ºC) unless we turn on the AC. First thought: thermal paste problem. Opened TV, found a black plate (passive cooling) attached to some components, one of them a processor with thermal paste, I thought, bingo. Thermal paste was hard as stone, nailed it! Changed the thermal paste to the same I use on PC, arctic mx-II or a noctua one, don't remember, retested, problem persists. Second thought: one connect must also have some passive cooling with the same style, tried to remove the board, won't come off, glued so hard it bends the board if I try to remove it without pre-heating it. Left the one connect box away from the TV and turned a FAN on pointing at it's carcassless body, problem remains. Replaced the fan from the one connect to the back of the TV panel with it's carcass still on, problem stops. So in my case I believe the problem lies somewhere within the TV panel box. Bought an used powersupply board for the TV box, problem persists. Going to try and remove the board from the one connect and reapply thermal paste there if I find somewhere appliable, but as I said, I doubt the problem is the one connect box. Sent the TV to an once certified SAMSUNG repair shop, they said the problem is the one connect cable (the most expensive part after the LED panel) which I refuse to believe is the problem, also they would charge me $50 man hours just to swap the cable after I purchase it, weird huh? A nope for me. Anyways, going to order both the T-CON board and the one connect cable, test them both and return the one I don't need. I will update here if I remember to do so later.