I have a lg plasma,and the problem is it comes on for about 1 second then shuts off. repair shop says its the power supply? what do you think? the led is red when off and turns off white almost very light blue when turns on , the screen lights up and in upper right corner is says component 1 and shuts off right away aprox. 5-10 sec from the time initialy turned on. when turns off makes a pop sound from speakers.

Walter,

Strictly from what I'm reading it sounds to me that your PCB has failed, or is failing. You will need to either;

1) Find your specific PCB (There will be a model number on the board itself) and order a replacement online, then install it on your own.

2) If you are not comfortable repairing it on your own, contact a local electronic repair shop and describe the problem as you've described it here and they will be able to further assist you.

Attached you will find an image of a common PCB layout.

Hope this helps,
Best regards.


https://www.ifixit.com/Device/Electronics TV Parts LCD TV Parts Plasma TV Parts TV Repair ShopJimmy https://www.youtube.com/watch?v=mL9nxYvf4NM&t=3s https://www.ebay.com/p/LG-70lb7100-uc-Power-Supply-Board-EAY63072301/10024317904?iid=273742970767&chn=ps

LCD TV Repair Tutorial - LCD TV Parts Overview, Common ...

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Plasma TV's are notorious for power supply problems, its most likely failing capacitors in the power supply. If you can find a repair shop i would take it in, otherwise you might also be able to find a replacement power supply board online, but its a crapshoot to find a good one so its better to try and repair/rebuild the one you have. If all else fails its just time for a new TV. It sucks, i know, but i see so many 2-3 year old TV's failing its like a plague of the repair shop.

Try unplugging it completely for 30 seconds to 1 minute. Plug it back in. If it still won't come on, it's likely taken a power surge and popped a fuse or power supply, which means a trip to the service center.

From what it sounds like here is your power supply unit may have some issues.

1. Take it to a repair shop if your not good at repairing this.
=======================================
If you are a tech:

1. check relay for clicks
2. check eletrolytic capacitors for buldging or holes.
3. Fets for voltages (req service manual or scematic)
4. Replace power supply.

Thanks I am sorry this was basic information but it was free and I would like if you please leave ratings and feedback on your free answer today/

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

i think this plasma have a main power switch check that and see what happen if is turn on then u are ok now if it dont have power is the power supply

Your right its a power supply issue and what your hearing is capcitor pop or maybe even a fuse, Well if you know about eletronics sure the new psu is going to be $150 bucks

hope this helps

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

it's your power supply that has gone. I had the same problem after owning my LG Z50PX2D for 2 months. The repair shop had it for 6 months. now I have the famous "POP & BLACK SCREEN SICKNESS" LG/Zenith should fix this.

If the repair shop says it is powerboard it means they already took a look at the TV and you dont need to worry about it.
If you have any doubt please post the sympton here (detailed) and I can tell you for sure what the TV needs.
I need to know what the led does and how it does.

I have a 50 plasma Toshiba and since this morning it turns on and off every 20 seconds by itself. The control is not working either. When it's on it nakes a static sounds and then just shuts off. If anyone can lep me please do so.