Question about LG 50PX1D 50 in. Plasma Television

2 Answers

LG 50PX1D, YSUS and ZSUS board replacement

1.) Been reading through these forums trying to pin down the exact part number for the YSUS and ZSUS boards and have found conflicting information. So...

YSUS =
6871QYH039B or
6871QYH039C

ZSUS =
6871QZH044B or
6871QZH044C

Which ones are correct?

2.) What is the difficulty level in plugging in the new boards? Where are they located? Difficult to access?

Thanks in advance for any help!


Posted by on

  • John Dixon
    John Dixon Jan 06, 2009

    So, after some more research, discovered that the letters indicate revisions (doh!)... so don't replace with 'A's, you want the 'C's if available.
    Also discovered that board replacement of any kind on these sets is only a temporary fix... they WILL pop again. If I understand correctly, the PDP is pulling too much power, causing these boards to POP. The only real fix is PDP replacement...
    Also, I answered my own question about the difficulties involved in board replacement... by removing the back panel to see for myself.
    ANSWER: A monkey could swap out the boards if it wanted to! Well... a monkey that had a little bit of experience with PCBs, anyway. Or not, who knows... The point is: if you've ever installed a sound/video card in your PC, you have the expertise.


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You can check the voltage through the X and Y sustain boards to see which is damaged.

Voltage travels the following direction on these TVs:

Power Supply:
http://www.discount-merchant.com/We-provide-factory-original-parts-worldwide-p/1 075235-zenith.htm

Then through Y-SUSTAIN:
http://www.discount-merchant.com/Y-SUSTAIN-PN-6870QYC004A-6870QYC004B-6870QYC004 C-p/vizio-sku9501.htm

By the way.. This is the MOST POPULAR failing part on these TV's... Above link has it for $154.99 and the quality and shipping time is outstanding. Be careful buying from a used dealer or someone not as big as Discount-Merchant is on parts. You may get a part that lasts 1/2 the time. These boards are like DLP TV lamps, they have a limited lifetime and if you buy from the wrong place, you will have to replace it more often and it can damage other components when it pops!

Next Power travels through X-SUSTAIN:
http://www.discount-merchant.com/Vizio-SKU9502-p/vizio-sku9502-psp.htm

Again.. only $154.99 and this is the 2nd most common failing part on these TV's..

......

To test which board is bad you need a multimeter... then test for the following:

1. disconnect the power board from the y-sustain board.. Check input into power board (is voltage coming in from the wall?) Next, test for voltage going out of the power supply.

2. Next test voltage going to the Y-SUSTAIN BOARD by having everything connected except the link between YSUS and XSUS. Check for voltage going into YSUS (if power supply is putting out, then ysus shoudl be receiving).. Next, test for high voltage comming out of the YSUS... keep in mind, xsus is disconnected.

If you get power comming out of the YSUS, this means your YSUS is GOOD and your XSUS is BAD....

If you get no power comming out of the YSUS this means that the YSUS is BAD.. in this case you need to replace your YSUS, however, you XSUS can also fail when your YSUS blows out.

In order to test your XSUS, you can use a multimeter to test breaking in the transistor module that has the big Black or Silver heatsink on it. You can test it by using a multimeter and applying it to the bottom pins of the board.

Again, Discount-Merchant.com seems to have many of these boards in stock and they are my lifesaver! The price is VERY LOW compared to anyone else, and the quality is outstanding. 1 year buying these boards from them without a single returned customer.

I bought one off of some jimmy guy on ebay and it blew in 1 month. I though i was saving myself money but the customer was back and very upset. Be careful!

Posted on Aug 04, 2009

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First thing that you can do is use the Google serch by just typing in lg 50px1d and see if you get any thing close to what you need.

Posted on Jan 06, 2009

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