Question about LG 50PG20 50 in. Plasma HDTV

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My lg-50PG20 powers up and has sound but no display. is it the control board or main board?

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  • Derek Williamson Jun 19, 2009

    Thats the problem, there is no picture what so ever. The screen doesnt come on at all. Do you have any idea wich board on it could be bad? I have had it for almost a year, but I bought it this way. The person I bought it from had only had it 3 months when the screen stopped working.



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Study the screen at several different angles; you should be able to see some ghostly images if the video chain is OK. If you can see this, either the backlight supply or fluorescent light source has failed.

Posted on Jun 19, 2009

  • bbwooly Sep 07, 2011

    It's aPlasma. It has no backlights. It is probably the Y boards. Replace them both.



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1 Answer

Have LG 50PG20 PLASMA TV .......Made loud popping sound and screen is now black but sound still work. Any ideas which fuse or relay to try replacing first???

The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

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Convert 42pg20-ua main board to 50pg20-ua

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

Aug 27, 2014 | LG Televison & Video

1 Answer

Where are the fuses on the LG 50 pg20

It can be located at the main power regulator board, y-sustain board and some other boards. There is not only one fuse used. Each section circuit is protected by a fuse.

Dec 10, 2013 | LG 50PG20 50 in. Plasma HDTV

1 Answer

My LG 50PG20 Television has audio , but no picture

If its just your video than I think its your back light inverter. However it could be the main board in your TV. I would call a repair man to come out and take a look.

Mar 02, 2013 | LG 50PG20 50 in. Plasma HDTV

1 Answer

Lg plasma flashing power

Sounds like its either the main board or t-con board or even possibly the inverter, however i do not think it is the power supply do to the fact that it does get power. Youtube the tv and model number and see if you can find videos that show same issue. That should help find an answer.

Mar 01, 2012 | LG 50PG20 50 in. Plasma HDTV

2 Answers

My lg plasma tv popped and now won't come on

Lisa, not 100% on the part you need to fix. But, try these guys out.....

Oct 06, 2011 | LG 50PG20 50 in. Plasma HDTV

1 Answer

Sound is there but no picture


Problem is in either power supply or the Y-Sustain board.

The Y-Sustain is a relatively large board out of which go connections to the side of the display; it's therefore closer to either the left or the right side of the display, has at least one rather large heat sink on it and fat power cables connecting it to the main power supply.

Often there are fuses on that board - one or more. Check those.

if they are blown you can try to replace them, but expect them to blow again - usually the whole board needs to be replaced.
Hoping this will help in solving the problem....

Jul 15, 2011 | LG 50PG20 50 in. Plasma HDTV

2 Answers

I heard small pop then lost power while watching my lg 50pg20. No red or blue lights on the power switch. What could be wrong?

you are describing a power supply defect. IT may be as simple as the main fuse. I believe the one in this set is a 6.5 amp located on the ps board right by cord connection. IF after replacing the fuse opens a second time you will need to replace the power board.
p[lease leave feedback

Feb 20, 2011 | LG 50PG20 50 in. Plasma HDTV

1 Answer

My LG 50PG20 Plasma has good picture, but no sound. All of a sudden it went out. How can I resolve this?

these is a power supplie problem (overload), needs to replace. Normaly is very specific board, on market dont have any spare parts on LCD TVs. better send to repair.

Jan 29, 2010 | LG 50PG20 50 in. Plasma HDTV

1 Answer

Have sound and no picture On LG_

This sounds like an issue that would be covered under the manufacturer warranty. Before looking for a replacement board, please get a hold of the manufacturer for service. Thsi particular model has a 2 year, parts and labor, limited warranty. This might save you some money. Here is the website for LG service:
When you call, you should have your serial number and model number ready.
Hope this was helpful
Have a great day!

Oct 30, 2008 | LG 50PX5D 50 in. Plasma HDTV

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