Samsung UE65MU7003U / BN41-02568B - HDMI No Signal

[natiz]

Yes the same behavior on the new board.

To clarify the issue, this is how it looks, no matter the port (1,2,3), the tv does not recognize a device is connected.

[Davi.p]

are you answering to me? please i don't see some users post because of black list, i am interested that you answer to my post n.9, have you done the fail count trick?
And also, how can you state that there was a.power surge? Other equipements failed at same time? Bad weather?

[CapLeaker]

Yes the same behavior on the new board.

To clarify the issue, this is how it looks, no matter the port (1,2,3), the tv does not recognize a device is connected.

Do you get to another similar screen "Device Detected" and want's you to do a manual setup?
I would definitely try a different HDMI cable like a 4k cable. Depending what you use as an HDMI source, change the picture format, like size and frequency (Hz).

[natiz]

Davi.p Yes I tried removed the "fail count" pin from the connector, it didn't help. I also tried disconnecting the backlight from the psu, didn't help as well (checked with a flashlight).

The power surge was due a lightning. It fried a sat/dvb-t receiver that was connected.

CapLeaker I tried a couple of them, they all fail on this TV. They work on others of course. I don't get any other screen - its not detecting any thing.

[Davi.p]

But you did not tried all the advice, ok, i do not insist, but at least it's time to get a full keys remote, and enter to the service menu, i think you have to do first a service reset, if no changes can inspect a voice like fail count, or fail count reset, i don't know that model, can be requested to enter the advanced menu using service remote simulation by android phone+ir blaster+wav files

[lotas]

If you connected the hdmi cable “hot”, that is, the TV was connected to the socket and the signal device too, and when connecting the cable, a discharge could occur (HDMI is very sensitive to static) and damage the processor, at the moment after operating the TV for half an hour, the radiator is very It heats up, if so, then only replace the motherboard.

You can use a multimeter to check the resistance relative to ground (ground) of the signal lines (differential pairs), there are 8 lines on each HDMI, there should not be short or low resistance, especially since Samsung did not install TVS diode assemblies on their inputs for protection, although there are seats .

[Diah]

still i don't think there are HW issue with original mainboards .. could be the register of the HDMI has being now blank or changed... log in service menu from Standby state and from there hard reset will register all HDMI again.

[CapLeaker]

Davi.p Yes I tried removed the "fail count" pin from the connector, it didn't help. I also tried disconnecting the backlight from the psu, didn't help as well (checked with a flashlight).

The power surge was due a lightning. It fried a sat/dvb-t receiver that was connected.

CapLeaker I tried a couple of them, they all fail on this TV. They work on others of course. I don't get any other screen - it’s not detecting any thing.

I am in front of a 40MU6300… weird. You did a factory reset on the new board?

[natiz]

To close the loop here - I did try everything on the two boards that I had (factory reset, etc.).
Got a new power supply from ebay - still no signal on HDMI with two of the boards.
After getting a new board from Aliexpress (together with the new PSU, didn't bother to check the old one) - HDMI works as expected

Thanks all.