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lg 32lh2000-za stuck in standby

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bluesmoke:
hi im after some help i have a lg 32lh2000 stuck in standby i have the 5v line and led on front is on  but i have no 12v or 24v is there any common issues with this ?
the part numbers are
mainboard EAX606866904(2)
power supply EX55176301/12

Please see photos attached thanks for anytime given to help

tv tony:
place an external voltage to force the psu on to isolate narrow the search down

bluesmoke:
i have a variable digital psu should i put it on the 12v of the mainboard  and keep the 5v of the tv psu connected ?

Mrwixes:
hi, did you solve this?
regards

Attilio:
Hello,
 pwr/on  signal comes from the motherboard?

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