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euro-pro llc
euro-pro llc, Technician
Category: TV
Satisfied Customers: 1636
Experience:  20 years in TV repair,certified by all major brands- Sony,Samsung, LG,Toshiba, Panasonic, RCA,
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Hi, I have a Samsung plasma HPT5054. While I am watching, the

Customer Question

Hi, I have a Samsung plasma HPT5054. While I am watching, the screeen turn to black( turn off). The sound still is still playing. I think one of the picture board is bad, but I do not know which one X,Y or Z-board. Do you show how to find which one is bad to replace?
Submitted: 7 years ago.
Category: TV
Expert:  euro-pro llc replied 7 years ago.


I will try to help you with this question.

Will you be able to follow some directions,and measure some voltages and resistances inside the tv set?

Thank you

Customer: replied 7 years ago.



Yes, I can do that if you can tell me in details where do you need to measure.

Expert:  Rick williams replied 7 years ago.


Edited by Rick williams on 12/21/2009 at 9:14 AM EST
Expert:  euro-pro llc replied 7 years ago.


I would like you to check several voltages inside the tv set.

These are the outputs from the power supply board-VS and VA.

Also I need to know what are the values for the Vscan-on the test point on the Y sustain board(the board to the left of power supply from the back), and Ve on the test point on the X sus board(the board to the right from power supply on the far right from the back).

Please see the picture below:


Please let me know,what you find,

Thank you

Customer: replied 7 years ago.



you ask me to check the voltage on PS board, Y and X-board, but you did not where is the to connect the DMM. I do not know which post is Ve, Vscan, VS and VA. Can you please included the picture of those connector

Expert:  euro-pro llc replied 7 years ago.

The test points are marked in clear on the power supply,Y sus and and X sus.

You need to connect the DMM(on Vdc) with the red wire to the test points and the black to the chassis ground.

here is a picture with the test points for VS and VA on the pover board,but there is no picture in the service manual for the Vscan and VE-you will need tolook for the marking/test point on Y sus( for Vscan) and on the X sus for the Ve.


Just let me know what are the readings.

Thank you

Edited by euro-pro llc on 12/21/2009 at 5:13 PM EST
Customer: replied 7 years ago.



I did measure. Here is the result: VS =207.1, VA = 63.2, Ve = 114.1, Vscan = 0. There is input voltage Vs = 207 for Y-board but I tried to measure several places on the Y board. The voltage is 0.

Expert:  euro-pro llc replied 7 years ago.

All right!Good job.

Vscan is a voltage developed inside the Y sus board .Since the Vscan is zero=most likely the Y sustain is defective.

You can try one more thing to be 100% sure if you want.

Try and disconnect the Y buffers(the two vertical,narrow boards-connected to the Y sus and panel).Just take the screws out of these 2 buffers and unplug them from the Y sus.You can leave them hooked up between them and to the ribbon cables.

With the buffers out of the circuit Check the Vscan again-if V scan still zero=Y sustain is defective.

Please post back the exact model code,something like HPT5054X/XAA,also the VER#(found on the label on the right side of tv) and I will provide you a part# XXXXX this Y sustain,and also a place where you can buy it.(serial# XXXXX the back cover would also help-Samsung is using many versions under the same model#).

Thank you

Customer: replied 7 years ago.

This is Samsung HPT5054X/XAA. Serial# XXXXX and the Version # XXXXX For the Y-board, Part# XXXXX

Expert:  euro-pro llc replied 7 years ago.

Ok,the Y sustain part# XXXXX this SQ24 version is:


It is available at:

I hope this will help you to get this tv fixed,

Thank you very much,was my pleasure to work with you!

Please remember,bonuses are always appreciated-if you can afford.

Happy Holidays to you and your family !!!

Customer: replied 7 years ago.

Thank you for your help, i will order now. hopefully will have it next week. I will let you know what happena and give you bonuses. Oh, do you know where can I buy a cheap Pioneer Plasma PDP-5080HD screen? My screen is crash and looking for a replament.


Happy Holidays to you.

Expert:  euro-pro llc replied 7 years ago.

Pioneer panels are very expensive due to the fact that Pioneer went out of flat panel business!

I do not think it will be economical to repair-unless you can get a defective TV on eBay or Craigslist,that is sold for parts(with a good panel).

Please click "accept" if you feel my answer it is what you asked and looked for.

This is the only way I can get paid for my work.

Thank you and have a great day!

euro-pro llc, Technician
Category: TV
Satisfied Customers: 1636
Experience: 20 years in TV repair,certified by all major brands- Sony,Samsung, LG,Toshiba, Panasonic, RCA,
euro-pro llc and 2 other TV Specialists are ready to help you
Customer: replied 7 years ago.



I got the Y-board. I installed it in. Turned on the power. I heard "tack tack" and saw smoke. I turned off the power and noticed that the new Y-board was burned. It is burn as the same place as old one. I spent $220 for it. What can i do?

Expert:  euro-pro llc replied 7 years ago.


There are two possible scenarios:

One is one of the Y buffers to be shorted and this to take out the Y sustain board.

If you look back at my posts,I did recommended to you to disconnect the Y buffers from the Y sustain and to check if the Vscan goes back to the normal value.

The other problem can be the panel itself(more rare that the Y buffers).

At this point you know that the Y sustain is bad and you will need to isolate the defective buffer.

Try and disconnected(as told before) the both buffers) and then hook back one by one to see what is the defective one.

You can try to return the Y board to the seller(I think they charge a 15% restocking fee).

You should understand,the diagnose we provide is based on the information we get.In your case the Vscan was zero=defective Y sustain.But this can be only an effect of the Y buffer or the panel being bad.

You will need a good working Y sustain and then you need to isolate the Y buffers,and try to see what is causing the Y sustain to get bad.

If you find that both Y buffers are bad and loading down the Y sustain,I believe that you have a defective(shorted) panel and this tv will not be economical to be repaired anymore.

If only one buffer is bad,then the chances are ,replacing that buffer and Y sustain will fix it.

I hope you will get this tv up and running,

Thank you

Customer: replied 7 years ago.

If I get a New Y-board and install it. Do you think it will burn again? Can you show me step by step how to test the bad Y buffer. I just afraid will burn it again.
Expert:  euro-pro llc replied 7 years ago.


Before you replace the Y sustain you need to make sure the VS,VA ,Vscan and the low voltage(15V to 17V) provided to the Y sustain are normal.

If this is the case,then it means that the Y sustain is actually blown by something 'after' it ,loading it down.This can be one of the Y buffer boards.

You ca try to disconnect both buffer boards from the Y sustain(just leave them hanging onto th ribbon cables on the panel side).

Try and turn the tv on with these buffers disconnected.

If everything is fine,the tv will stay up nd it will run(with no picture ,of course,but it will not blow the y sustain again).

Now,you could try to connect the Y buffers ,one by one back into the circuit,but it is risky,because the defective Y buffer can blow the y sustain very fast!!

Samsung recommends in situations like this to replace all three parts at the same time:

Y sustain,upper buffer and lower buffer.

If ,after replacing all three,it still blows one or more from this 3 boards it is pretty sure that the plasma panel is shorted somewhere internally and it blows the buffers and the Y sustain over and over again.

At that point,the tv will be not economical to repair due to very high cot of the panel.

I hope this will bring you some closure,

Thank you and have very good New Year!

Customer: replied 7 years ago.



I got the Y sustain and 2 Y buffers yesterday. I did the same as you said. I installed Y sustain, measure the voltage. Working fine. Next I installed the low Y buffer( only connect to Y sustain and screen panel, not connect to Up-Y buffer). I turned on the power. The Low-Y buffer was burned right away. I turn off the power, disconected the Y buffer then turn on power again. Measure the voltage of Y sustain. It was still ok.


So, this is caused by bad palsma panel, isn't it? or Did i do something wrong in my steps?


Thanks Mike

Expert:  euro-pro llc replied 7 years ago.

Since the lower buffer burned right away I believe that you do have a shorted panel, and only replacing the panel will fix the tv.

Sometimes ,there is no other way to decide if a panel is bad or not,only by replacing the shorted parts.If they short again,then the panel is defective.

A new panel will come with the Y sustain upper and lower buffer and also with the X sustain on it,already preadjusted.

But the cost of the panel will be very high,for a 50" like this it will be about-1000-$1300.

This will make this tv not economical to repair.

What I would recommend is to try and sell the tv set AS IS (eBay or Craigslist) for parts,and to recover this way some of the money invested in parts.

I know,that trying to repair the unit by yourself,it seems a good idea,but this is why I do recommend professional repair, because in cases like this ,it would be the tv repair shop loss ,and not yours.Any tv repair shop would have to go through the same parts replacing ,before they would have call it a "defective panel"

The tv repair shop loss would be less ,since the authorized shops get the parts a lot cheaper than regular buyers.

Selling this tv for parts ,should get you back at least-$150,

Thank you and have a good day!