My RCA hd52w58 green pwer light stays on but won't turn on. I pulled the back off and the cooling fan on the board is running. I saw another post about a burnt fuse but I don't see any fuses on either board. Any info. would really help.
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Try the following-
Before you turn it on, set a large fan ("breeze box") or similar behind the set and aim it toward any lower openings you see.
If this lengthens the time before it shuts down, then a cooling fan normally found in the lower cabinet area is not running.
Those sets can have significant hot areas and may have a thermal shutoff to prevent fire in case of a fan failure.
If the cooling fan is running, the main power supply is sending you a message; it will eventually die and not come back.
Check for fan operation first, then, if it is running, pull the AC plug overnight, remove the lower access panel and look for a separate board visibly related to the AC line coming in. This board will have larger components on it, some cyllindrical some block-like.
If you can find the assembly number (often on a label) record it, if not, then your exact model number, call the mfr. and ask about repair or replacement cost.
If you have to buy a new board, don't pitch out the old one but look for an independent repair company offering power supply repair.
The repair cost may not be much lower than a new board but if you have one on hand, you won't miss much TV while swapping out the 2nd failed supply.
maybe there is a lizard inside, open the back cover then remove the PCB. re solder the damaged area and clean it with an electronic spray cleaner. check for cold solder component leads and re solder it.
There is a small fuse in the board beside or close to where your power cord goes into your tv. Pull the fuse to see if it needs replaced. It will only cost a couple of books. Mine did this after a lightning storm.
This can be a green crt or green driver pcb problem. You can try and unplug the tv for 30 min. and plug it back in and turn it on, but the problem will most likly still be there. A repair shop will need to fix it from there.