beko 32wlu520hd

[piccy]

Hi ,
have a problem with missing voltages on this set beko 32wlu520hd
there is no 12 or 24 volts the standby line briefly jumps to around 3.8v but then settles back to a constant 1.7 and the 5v line is present , there is no brief indication of any voltages on 12 or 24v when the voltage on stby is at 3.8

i cannot find any caps issues although i have not replaced any just checked with esr meter, there is no obvious shorted diodes or o/c resistors ,

the psu is a fsp223-3f01
main board is yca190r-4

i am beginning to thing i should be looking on the main board for this fault ?
any help please

[piccy]

Re: beko 32wlu520hd

can anyone tell me if i can do this,
if i isolate the stdby wire from the main board and apply 3.8v to the stdby pin on the psu from the 5v line via a resistor dropper to see if the 12 and 24v lines come up will i cause any damage ?

also have found there is 3.4v on the bl on pin on the psu

also can these supplys be tested out of the tv in any way , would i have to provide somer kind of load on the supply outputs and if so what is suitable for a load

thanks