Question about LG 42LC7D-UB Television

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M228WDP-BZ - Pure white screen. Power supply board checked. Voltages through connector to main circuit board OK. Changed main circuit board without any improvement. Need to know the voltges that should be found at the connectors from the power supply board to the screen?

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6ya6ya
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Posted on Jan 02, 2017

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  • 380 Answers

SOURCE: to make a long story short originally bought the

Sounds like the y sus was blown out but what cause it. Were you careful when you were checking voltages? As long as you didn't short 2 components together, your y sus should be fine. Unless the y buffer up and/or down blew them out. Even the panel could blow it.

Basically you need a scope to adjust the ramps and everything. You can adjust VA and VS with a meter. If you don't have access to a scope, then just start changing the ramps etc by eye. It might take a little bit to get but eventually you'll get it.

Posted on Mar 14, 2010

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SOURCE: while checking Vscan voltages on my LG du-42px12x picture died.

I have the same problem the pic went out but have sound. where do i go to get the Yboard? do i need a special number off of it or something? I took it to repair shop and he said it would be like 500 dollarss to repair. but i see all kind of yboards on ebay for like 150?? how do I know what one to buy?

Posted on Aug 08, 2010

TV #1
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SOURCE: Hi There, I have acquired an LG RT42PX10 Plasma,

Aaron,

If you have a bubbled on you r Y sus board you need to replace the cap if you can find it or you can
replace the the Y sus board. 6871QYH029A SUS Y

Thank you

Posted on Nov 02, 2010

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taran_2005
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SOURCE: Hi! My name is Le Tran. My LG 42PQ30 has no

Hi,

This is a common problem on Plasma's. This is an issue with Zsus and Ysus board. You need to inspect and replace both the boards.This is not an issue with power supply or ' caps'.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Nov 21, 2010

  • 586 Answers

SOURCE: LG 42PG20 Plasma blew a

Hello,

Once the voltage the television is connected to is very high, there is a very high tendency that the board will blow again, and it might not be as soon as you replace the board.

You will still have to replace the board, but you will try to get a board with higher capacitance on the capacitors. That way if exposed to higher voltage it wont get bad.

Also a tip is for you to get a step down transformer for your television or a stabilizer so as for the television not to be exposed to a very high current. That should help reduce the risk of having the board getting burnt again.

The screen only vents out once there is excessive heat in the unit and the fans in it are not working, then the screen can vent out.

Carefully assess all the boards on the television for any bad capacitors, like the ones that are swollen, it is not necessary for them to be bursted or smelly before they are bad, you just have to check for the ones that are already swollen.

Hope this information was helpful in solving the problem.
Goodluck
Elect_Comp

Posted on Jun 28, 2011

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Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/
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Fault to the main power supply regulator section. 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. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
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Fault with the main power supply regulator 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. Surf the site with patience. Pull up older posts. Check the Va & Vs voltages to the panel, too. These voltages are to be noted well, even after replacing a new power supply board. Details about this can be note at the silk screen on the panle [inside].
http://electronicshelponline.blogspot.com/
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