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dicepackage
Joined: 14 Sep 2009
Posts: 40
Location: Detroit
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 Posted: Wed Oct 28, 2009 11:41 am Post subject: Do I need to replace my TV's buffer boards? |
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Vizio 50 Inch Plasma
Model: P50HDTV20A
Manufactured: November 2007
Condition: Audio but no picture
http://homepages.wmich.edu/~s4sessio/tv.JPG
If you go to that link I added a picture of the inside of my TV (P50HDTV20A) if that helps.
On my TV I have replaced the buffer boards but not the Y-Main board. That did not fix the problem and I have probably only ten minutes on the new buffer boards. My question is do I need to replace the buffer boards when I replace the Y-Main board? |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Wed Oct 28, 2009 3:12 pm Post subject: |
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In order to answer that I need to know what you have done/checked prior to replacing the buffer boards and why the buffer boards were replaced. If it was simply a guess, that's as good an explaination as any.
Jesse |
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dicepackage
Joined: 14 Sep 2009
Posts: 40
Location: Detroit
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| Posted: Wed Oct 28, 2009 3:41 pm Post subject: |
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It boils down to a simple guess on the buffer boards. I bought the TV broken and was told that was the problem but it was never professionally checked out. I assumed the diagnosis was correct because the upper buffer board made a slight hum if you put your ear right up to the upper most microchip on the upper buffer board.
I personally have checked the power supply output DC voltages and they are all coming out correct. The main board appears to be functioning as I am able to get audio and the TV is responsive. I have read that this problem is common and is known as the pop of death with the most likely culprit being the y board.
My concern is that the Y-board is bad and may have shorted the buffer boards and if I replace the Y-board the now damaged buffer boards will destroy the new Y-board. I would like to know if there is any truth to my concerns. |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Thu Oct 29, 2009 11:20 am Post subject: |
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It is most likely that the buffer boards are all right. I usually replace the Y-main pcb first as I have never had the buffers, even if they were bad, damage the Y-main for the short time set was on. I suppose that it could happen if you left the unit on for an extended time.
Now for the bad part, it is possible, even though unlikely, that the logic board is the problem and the proof would be if the Y-main does not repair the unit.
These units can be frustrating and sometimes expensive to repair as you, by now, are finding out.
Hope this helps
Jesse |
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dicepackage
Joined: 14 Sep 2009
Posts: 40
Location: Detroit
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| Posted: Thu Oct 29, 2009 11:39 am Post subject: |
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Thank you very much for your help.
Ok I have one last question now. My Y-main board is model number PCB # LJ41-04217A. I see on eBay that they have this part for 96 dollars from a Sanyo TV and 121 from my TV. Does it matter which part I get or can I save a couple bucks and go with the one from the Sanyo TV. |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Thu Oct 29, 2009 12:10 pm Post subject: |
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Part Type YSUS, Y-Main, Y Sustain
Part Number 6871QYH039A
Manufacturer Part Number LG 6871QYH039A
Manufacturer Part Number Vizio 6871QYH039A
Philips 996500030905
Manufacturer Part Number Toshiba 75003042
Sony 1-789-386-11
Board Number(s) 6870QYC004C
6870QYC104D
6870QYH004D
Substitute Parts 6871QYH039B
Known Models LG 50PC3D
LG 50PC3D-UC
LG 50PC3D-UD
LG 50PC3D-UE
LG 50PM1M-UC
LG 50PX1D
LG 50PX2DC
LG 50PX5D
LG 50PY2DR
LG 50PC1DRA
Toshiba 50HP66
Philips BDH5021V/27
Sony FWD-50PX2
Sony FWD-50PX3
Maxent MX-50X5
Maxent MX-50X3
Vizio P50HDM
Vizio P50HDTV10A
Vizio P50HDTV20A
Vizio VP50HDTV20A
HP PL5060N
Polaroid PLA-5048
Zenith Z50PX2D
Zenith Z50PG10
TV Panel Model PDP50X3####
TV Panel Manufacturer LG
This board is used on a slew of different sets.
The board itself is a Samsung part.
Look on the board for a 6871#### (Printed on the board itself) and this will be the one you have.
E-BAY???????
I though everyone new that this is an AUCTION house. What you get may not be what you want. (it may simply be something someone wants to get rid of not caring if it works or not)
Sorry for the rant, it is probably obvious that I don't like E-Bay.
I am constantly getting people coming into my shop trying to get warranty repairs on a item they bought at auction. For some reason some people think that the items sold on E-Bay are new.
I'm not saying you can't get lucky. What I am saying is on E-Bay (Buyer Beware)
and if your unit still does not work, you will never know if it is because of a jerk on E-bay or something else in your set.
Good luck on your purchase.
Jesse |
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dicepackage
Joined: 14 Sep 2009
Posts: 40
Location: Detroit
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Thu Oct 29, 2009 2:21 pm Post subject: |
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You are right about so many variables within Vizio.
With the numbers you gave here are the variables to consider.
Panel number and manufacturer.
You can look here for these numbers also and they will also give the rest if the information pertaining to suitability. http://www.shopjimmy.com/
The prices are comparable ($118.97)and its not E-bay.
These parts are much higher in price if you go thru a distributor. Like about $200.00 plus 50.00 core. I have used this place a few times to acquire hard to find parts and have had no trouble.
Jesse |
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dicepackage
Joined: 14 Sep 2009
Posts: 40
Location: Detroit
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| Posted: Wed Nov 04, 2009 5:34 pm Post subject: |
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http://homepages.wmich.edu/~s4sessio/Picture.jpg
I replaced the Y-Main board and this is my picture. What you are
seeing in the bottom right is burn-in. There is a line in the middle
of the picture however. Below the line has a lot of static and
artifacts and the top portion has the same problem but it isn't as
bad. |
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Jesse Mack
Joined: 22 May 2008
Posts: 600
Location: The Last Frontier
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| Posted: Thu Nov 05, 2009 1:54 pm Post subject: |
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The problem you are showing is indeed the buffers. However, if you have upper and lower buffers it may need to only have one of them replaced. The picture is divided into an upper and lower half and many sets use upper and lower buffers. If the lines displayed are below the half way mark only the lower buffer needs to be replaced.
If you put your finger on the buffer IC that is directly adjacent to the lines you will probably find that it is running hotter than the rest.
Also a warning..... Some buffers on some sets use connectors that can be tricky to disengage and if you tear the flexible plastic going to the panel you will get to buy a new tv.
Also, when replacing the Y-main and any buffers that need to be replaced you need to make sure that the power supply is running at the specified voltages printed on a sticker on the panel. The voltages that need to be checked are usually called Va Vs Vg etc. the power supply will have test points for these symbols and will have adjustment pots that will also be marked. Use chassis ground for measurments. Do not slip as bad things happen.
Hope this helps.
Jesse |
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