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LG 32LN5100 power problem

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vanguardviper:
Hi
I have a LED TV
Model : LG 32LN5100
there is a problem with power board (Model : EAX64905001)
after testing the board I figured that the Chopper circuit is dead , so I tried to replace it with these options :
Viper12A
5L0380R
DS0088 Module
all three methods managed to give standby light (with all voltages) still when trying to turn on , TV light (backlight LED) blink and return to standby .
I checked CAPS , Diodes , Resistors ... all seems to be good .
I've noticed that there is some voltage drop when turn on .
Voltages :
3.3V
11.8V
24.5V
Am I missing something ?
thanks in advanced .

downunder:

Have you checked the backlight LEDs. A failure there will cause protection to activate.

vanguardviper:

--- Quote from: downunder on September 22, 2021,02:53:45 ---
Have you checked the backlight LEDs. A failure there will cause protection to activate.

--- End quote ---
Thanks for reply
I tried another power board and TV worked well , so it's not a Backlight problem , nor Main Board problem .
I have 2 power board with the same problem , and I'm trying to fix them .

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