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My LG 42PG20-ua will not power up. It registers the ac power, lights up the power button "blue" for a second than begins a cycle of powering of and on by itself. I am certain the ac cord is good, has good connections on both ends, and has the right voltage output as tested with my meter. Whats going on with this thing???!

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It seems power supply board is not providing sufficient voltage supply to system control board to boot up thus system control chip gets reset and try to boot up again and this goes on and on
Check output voltage of power supply board as connectors shows expected voltage reading there.
Or replace power supply board to confirm the issue.
There are two type of power supply boards available in Shop Jimmy for your tv, click Type-1 and Type-2 to recognize what board is similar to your tv to order it online.
Hope these info will help you to solve your LG 42PG20-UA plasma tv problem.
Thanks.

Posted on Aug 25, 2010

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Posted on Jan 02, 2017

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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. http://electronicshelponline.blogspot.com/

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Lg 42PG20 possible to work on a 220 volts?


The correct answer is "it depends on the power supply board used in it".

If you click on the picture at

http://www.coppelltvrepair.com/p/716/lg-42pg20-ua-power-supply-board-repair-service

and look at the lower left corner of the board you will see

100v-240V

printed in the lower left corner.

That board used in 42PG20 will definitely work on 220V.

Your TV may have a different board inside though.

DO not assume...verify.

Hope this helps!

www.coppelltvrepair.com

Jun 29, 2014 | LG 42PG20 42 in. Plasma HDTV

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Won't turn on for several tries


The most common reason for this behavior are worn out / failed electrolytic capacitors on the power board.

Those are easy to identify as they are usually bulged and easy to replace. We recommend to do it yourself and if you don't want to then find someone local, bring them the board and have them do it for a coffee or $20 at most (including parts).
If the problem is more complex you can use this:
http://www.coppelltvrepair.com/p/716/lg-42pg20-ua-power-supply-board-repair-service

We've also seen the same caused by a problem on the main board, but that is a remote second possibility. When it is, it's probably best to just get a replacement main board.

Sep 01, 2013 | LG 42PG20 42 in. Plasma HDTV

1 Answer

Orange bars flashing around the screen


This is a link for repairing the power supply board of a LG 42PG20, which also contains a link to an article on how to test the board's functionality, which is actually fairly simple:
http://www.coppelltvrepair.com/p/716/lg-42pg20-ua-power-supply-board-repair-service

May 16, 2013 | LG 42PG20 42 in. Plasma HDTV

1 Answer

I have an LG plasma tv model # 42pg20-ua. Everytime I try to turn it on the tv keeps clicking turning from blue to red. Tv never actually turns on. I keep trying to turn it on, but it just clicks and...


that is usually a t-con board or video card. ebayers usually have those parts reasonable.

that's how I fixed one of mine.

it could be the power board which is the costlier part.

Aug 01, 2017 | Televison & Video

1 Answer

I have a LG 42 inch plasma that turned off and doesnt want to turn back on. im thinking is the sensor is there anyone that can help out with this problem?


If you can turn it on with the button on the unit itself then it may be the IR sensor, but if you can't turn it on then it is very unlikely the sensor.

The power supply board of the 42PG20-UA is a known source of exactly this problem, although definitely not the only one that could possibly cause it.

Below is a link for a repair of the board, but the listing also contains a link to an article on how to test the power supply board alone, which is pretty useful before spending time and money sending it for repair. If anything you can rule one board out:
http://www.coppelltvrepair.com/p/716/lg-42pg20-ua-power-supply-board-repair-service

Nov 17, 2012 | LG 42PG20 42 in. Plasma HDTV

1 Answer

42PG20 42 in. HDTV Plasma TV: i have an lg plasma tv - 42pg20 when i turn o...


There are several known issues that can cause that.

The top candidate is the main board, the next is the Y-Main board.

Here's a link for repairing the power supply board of LG 42PG20, which also contains a link to how to test your own board to see if it is good or not:

http://www.coppelltvrepair.com/p/716/lg-42pg20-ua-power-supply-board-repair-service

Hope this helps!

May 17, 2010 | LG 42PG20 42 in. Plasma HDTV

1 Answer

When I turn on the TV the blue indicator light comes on but there is no display, then the blue light starts blinking.


The following steps should be able to correct the problem:
1) Unplug the TV or remove AC power from the TV
2) Count to ten and then plug in the TV
3) Locate the [Menu], [VOL-] and [Power] button on the TV’s side panel
4) Using the buttons on the TV’s Side Panel, press and hold both the [Menu] and [VOL-] buttons.
5) While holding those buttons, press and release the [Power] button one time and count to 3 before releasing the [Menu] and [VOL-] buttons.
6) The TV’s lower left Blue Power LED will come ON.
7) Wait 30 seconds. Confirm that the blue LED on the Lower Left of the TV (not the iPod dock for iPod models) has remained ON during this time.
8) Press the [Mute] button on the TV remote twice
9) Unplug the TV or remove AC power
10) Count to ten and plug the TV in
11) The TV power should automatically come ON and the blue power LED with be ON
12) Wait 40 seconds and the TV picture should appear
13) You can now continue using your TV.
14) If the picture does not appear, power on the TV manually:
· If the LED begins flashing, unplug and power ON a second time.
· If the LED begins flashing again, power ON the TV without unplugging
If the LED begins flashing again, contact us directly by phone to obtain a local authorized service center for you.
If the TV does power on, please reply back with the software version number for us to research this issue. Please follow these steps to obtain the software version number:

1) Press the [Menu] button on the remote control.
2) Using the arrow keys in the center of the remote, scroll over to the "settings" menu and select the [OK] button on the remote
3) Scroll down to "system info" and select [OK] button on the remote

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