Hisense LTDN50K220WSEU stuck in standby

[toty79]

Hello to all friends of the forum and well found, here I am asking for your help and sorry for my translated English.



As per Hisense tv title LTDN50K220WSEU stuck in standby
PSU rsag.820.5687 HLL 4855WF
Main rsag 7.820.5842
I enclose the psu diagram, after the first routine checks I find myself with a regular standby voltage of 3.3v blue light on steady when the power button is pressed nothing happens, psu disassembled and bench checked ... forced ignition by sending a signal 3 , 3v on the SW and PWM2 pins the psu turns on and delivers all the voltages also the backlight turns on (190Volt) so I think the psu is ok even if I find the 16v voltage a bit high (23v) when empty .. my search moves to the main of which unfortunately I do not have the diagram ... first checking all the regulators I find a position regulator N36 regulator SE8117TA suspect
Pin 1 = 0.48mv
Pin 2 = 0.66mv
Pin 3 = 5v
replaced with BM1117 adj now I have voltage at pin 2
BM1117 replaced with tensions
Pin 1 = 0.25v
Pin 2 = 1.5v
Pin 3 = 5v
still blue led steady and tv stuck in standby,no return voltage from mainboard all the other controllers are normal, any advice is well accepted thanks to all

[dskall]

Re: Hisense LTDN50K220WSEU stuck in standby

Try heating up processor with heatsink removed and try turning tv on.

[toty79]

Re: Hisense LTDN50K220WSEU stuck in standby

Thanks dskall ... trying to heat up the cpu, the TV started up after a while about 10 minutes and returned to standby and did not start anymore ... trying to heat part again but after a while the defect returns ... I have no equipment for reballing then I opt for a used mainboard ... thanks to all