SAMSUNG UE55TU7002KXXH rebooting

[unimatrix93]

Did you use the ICs to fix the board and get it working again?
If not, then those might not be the issue/solution.

I'm did not fix up the board yet, the new board works perfectly in the TV.

The issue with my previous board is the IC and the burned resistor next to it.

[KYBOSH]

I ordered a new mainboard for a decent price and it is working perfectly. I also ordered the IC which Iotas recommended to fix up my faulty board.

Did you use the ICs to fix the board and get it working again?
If not, then those might not be the issue/solution.

[unimatrix93]

to be continued ???? no next episode fren?

I ordered a new mainboard for a decent price and it is working perfectly. I also ordered the IC which Iotas recommended to fix up my faulty board.

[bohaboha]

I found this one based on the TLV9062 at my local distributor.

to be continued ???? no next episode fren?

[unimatrix93]

The link doesn't open for me...
Look at these options
COS722, TLV9062

I found this one based on the TLV9062 at my local distributor.

[lotas]

The link doesn't open for me...
Look at these options
COS722, TLV9062

[unimatrix93]

There is no pinout in the datasheet, so search for "RRIO 10MHz Amplifier"

Is any of these are sufficient replacement?

https://eu.mouser.com/c/semiconducto...%20min=2.4%20V

[lotas]

There is no pinout in the datasheet, so search for "RRIO 10MHz Amplifier"

[unimatrix93]

The marking is not visible in the photo, is it DIO2072?

Yes it is.

[lotas]

The marking is not visible in the photo, is it DIO2072?

[unimatrix93]

You can take a high-quality photo of this microcircuit.

I hope this clear enough.

[lotas]

You can take a high-quality photo of this microcircuit.

[unimatrix93]

Replace it. It also relates to backlight adjustment... But which resistor burned out, what should its resistance be?

R170, the one missing between the cap and the resistor.

I can measure 140kohm on it, but since it let out magick smoke, the resistance of it might changed.

I couldn't find the exact IC on any supplier sadly, maybe using something else with similar attributes could work?

[lotas]

Replace it. It also relates to backlight adjustment... But which resistor burned out, what should its resistance be?

[unimatrix93]

Where is it located, in the backlight chain? You can take a look at a high-quality photo.

As far as I can see, it's part of the backlight. I desoldered the IC to measure it's pins outside of the circuit and indeed the GND leg has 56ohm resistance to all other leg on it.

[lotas]

Where is it located, in the backlight chain? You can take a look at a high-quality photo.

[unimatrix93]

I found the schematic of the IC.

Also turned out that the burned component is a resistor. I removed it from the circuit and I measure low resistance (53ohm) to ground on all of the non-GND pins of the IC.
Could this be the issue?

[unimatrix93]

I think you have over-powered the backlight, check...

Yes, you are right, I measure 170-200V on the discharge pins while the backlight is trying to stabilise.

Also I found something suspicious:

This small ceramic cap is next to the IC marked DI02072 which is right next to the backlight connector.

[lotas]

I think you have over-powered the backlight, check...

[unimatrix93]

So your PFC is working, check those capacitors for capacity and esr, with a jumper and the panel disconnected, how does the TV behave?

I proceed to check the capacity (I don't have an ESR meter at hand sadly).
With the jumper on and the panel disconnected, the backlight stayed on for a long 2 minutes, at high brigthness. The tv responded to my remote commands, bleeping with menu sounds, then it went into restarting again. The difference is that the backlight had much higher brightness and it the tv were stable for 2 minutes instead of a few seconds.

Also, no short on the signal lines you mentioned.