Samsung QLED QN75Q8FNBFXZA inverted/negative color

[j879]

Got 2 more closer pictures now I can see the part/model number. Shall I remove the 6514Ps ?

[j879]

The problem may be in these protective diode assemblies (leakage, breakdown of one diode, short circuit to ground...) and in my opinion your resistor turned black because of them.

And check, if something starts to heat up too much, then there is a problem there.

You are absolutely right. I use an infrared temperature gun measured the the right side as you mentioned with dark resistor, the temperature of the resistors are 10C higher than the opposite side.

Then I disconnect the ribbon cable to the overheated skinny board the color turns back normal without 1/4 of the display.

I guess next step is to find out the broken resistor or diodes. The temperature of the protective diode assemblies are normal compare to the other side. I'm going to remove one by one and see what happens.

Do you know whats the model number of the diodes assemblies?

Many thanks both of you!

[nomoresonys]

So check that dark resistor, as suggested see if any of those diode packs are hotter than the others, if so remove it and recheck tv.

[lotas]

The problem may be in these protective diode assemblies (leakage, breakdown of one diode, short circuit to ground...) and in my opinion your resistor turned black because of them.

And check, if something starts to heat up too much, then there is a problem there.

[j879]

hi guys,

My 5 years old SAMSUNG QLED got color inverted somehow. I have tried reset, replace mainboard as well as the driver board without luck. The issue must be on the circuit on panel skinny board or so. For this model I could not find the dedicate T-con board so AS15 replacement is not applicable..

I have upload the pictures

Maybe I should measure the gamma voltage but I couldn't find the right place.

Any idea would be appreciated.