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...

6871QYH039B or

6871QZH044B or

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.



2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Contributor
  • 34 Answers

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: 075235-zenith.htm

Then through Y-SUSTAIN: 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:

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, 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

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has answered 20 questions.


    An expert that has over 10 points.

  • Expert
  • 86 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Technician (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Where is Zeus board located

Samsung HP-R5072 50 in. Plasma HDTV Board ysus lg ... > ... > Samsung HP-R5072 50 in. Plasma HDTV
Samsung HP-R5072 50 in. ... LG 50PX1D, YSUS and ZSUS board replacement ... andZSUS boards and have found conflicting information. So... YSUS = .

Samsung HP-R5072 50 in. Plasma HDTV Ysus - Questions ... > ... > Samsung HP-R5072 50 in. Plasma HDTV
LG 50PX1D, YSUS and ZSUS board replacement 1. ... right away I found a bad fuse on the ysus board and replaced it. if i unplug ysus board the unit stays on.

Jan 18, 2016 | Samsung Televison & Video

1 Answer

I have a 50in vizio hdtv20a and the amber light is on in the corner but it will not power up

The number one reason for this is failed YSUS board EAX37106201 . There are two ICs on it and one of them shorts, preventing the TV to power on.

The second most common reason is failed power board EAY32929001. There are several different things that can happen on it, but the first I'd look for if I were you is visually swollen electrolytic capacitors on the board. Look that up on Google and you'll see plenty of pictures of what to expect.

The third reason would be a bad ZSUS board EAX34042701 / EBR37284601 . Same as with the YSUS, only this is less common and, this one can actually be tested really easy by disconnecting the ZSUS from power and trying to power on the TV again. If it does come on (even with blank screen) then it's the ZSUS that is bad.

You can and should do the same with the YSUS, but it will only work if the ZSUS gets power directly from the power board and NOT through the YSUS board. I am not sure how they were on P50HDTV20A in particular, but in those models usually the ZSUS gets power through the YSUS and thus if you disconnect YSUS from power you automatically disconnect ZSUS as well, which is not good for tests as the power board needs load on the Vs line.

Well...hope that helped...don't forget to rate it if it did!

For more check out or email us directly.

Sep 18, 2011 | Televison & Video

1 Answer

I have a lg 42pc3dv plasma tv. it made a loud pop

Looking at it from the back, the board on the left is the ysus. You should see a big red cable coming from the power supply board in the middle of the set going to the ysus. Near the red cable plug on the ysus should be a fuse. Most likely the fuse has blown. If it is you need a ysus PCB. Check out If you get a new board be sure to set all the controls on the new board to match the old board. If you don't you will have little sparkles all over the screen when it comes back on. I hope this helps. You may want to check all fuses on the power supply and the zsus which is on the right side of the set. I have seen both the ysus and zsus be bad together. Good luck and thanks.

Oct 24, 2009 | LG 42PC3D 42 in. Plasma Television

1 Answer

How to change lamp in toshiba 42hp66?

This TV is a plasma according to the model number you've posted. It does not use a lamp.
If the plasma does not show any picture, there might be a defective Ysus, Zsus or power suppy board.
There is a high failure rate on the Ysus and Zsus boards.
Search for a Ysus and Zsus board on google and you should find them.
Good Luck.

Jul 02, 2009 | Televison & Video

1 Answer

Hello, I just experienced the same problem...two pops from my LG Plasma 50X1D and now a blirred or hazy picture is all that remains. Can you please help with what and how to repair this problem? Thank you...

This problem is always either the ysus bd or zsus bd failing and sometimes both. As a rule because these boards work together as the scan and return when on fails I replace both. The part # for most versions are YSUS = 6871QYH039C and ZSUS = 6871QZH044B and can be found on either the Andrews Electronic or Vance Baldwin website.

Jun 24, 2008 | LG 50PX1D 50 in. Plasma Television

2 Answers

LG 50PC5D 50 in plasma

Service information may be available on LG website but I am not sure. I am sure that when the LG plasma pops and goes out a high percentage of those type failures require the replacment of the YSUS and or the ZSUS boards. I believe the YSUS is 6871QYH039C and the YSUS is 6871QZH044B. You can get those from Andrews or Vance Baldwin.

Jun 21, 2008 | LG 50PX1D 50 in. Plasma Television

1 Answer

Picture went dark

This problem can be a bad YSUS or bad ZSUS and I recommend replacing both. The part #s are 6871QYH039B and 6871QZH044C. These parts can be found at Andrews or Vance Baldwin.

May 29, 2008 | LG 50PX1D 50 in. Plasma Television

1 Answer

No Power

There is a main AC fuse on the power supply bd. and a couple of ciramic fuses on both the ysus bd and the zsus bd. This symptom most of the time means either the ysus bd, the zsus bd. or both have failed. Difficult repair for a customer and most likely will need to have a qualified tech diagnose the problem. Most times it is the ysus that has failed and a realistic price to repair this is from 400 to 500 dollars.

Jan 12, 2008 | LG 50PX1D 50 in. Plasma Television

1 Answer

Lg 50px4d

LG 42" Plasma TV 42PX3DCV Parts - YSUS ZSUS CTRL Part Number (set): 6871VSNB03E Part Numbers (individual): 6871QYH036D, 6871QZH041B, 6871QCH053G Part Number: 6871QYH036D Description: PCB ASSEMBLY, DISPLAY YSUS ASSY 42V7 FOUND THESE ON THIS: HOPE IT HELPS

Feb 26, 2007 | LG 50PX4DR 50 in. Plasma TV

Not finding what you are looking for?
LG 50PX1D 50 in. Plasma Television Logo

4,044 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Televison & Video Experts

Computer Repairing
Computer Repairing

Level 3 Expert

14641 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

The Knight
The Knight

Level 3 Expert

74858 Answers

Are you a LG Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides