SHARP LC-40LE814E does not turn on 2 flashes

[Egidio85]

hi, I have a sharp tv model LC-40LE814E with DPS-126CP-1 A power supply.

the tv initially turned on, displayed the image for 10 seconds and then turned off. so in a loop until the power was cut off.

reading the classic optocoupler problem I changed the mounted cosmos with SHARP PC817 recovered from other boards.

now the TV turns on for 1-2 seconds and turns off giving 2 flashes in the front LED.



to avoid banging too much I preferred to take an identical tested and working card (or so the supplier says)

with the new card it only flashes 2 times on the front LED and the backlight doesn't even start for a few seconds.



you can't even enter adjustment mode with the procedure shown in the manual.

Any advice on what it could be or what to try?



Thanks in advance