Samsung PH-T5040 no picture but sound,high cost to repair!

[Sevenqi]

Samsung plasma model number PH-T5040 , no picture has sound, open the back cover and test the Vs(207v),VA(64V),normal. The fuse on Y-Board (left sdie) and Z-Sustain(Right side) board, good.
However, when I touched the heatsink on the y-board, three of them were cool,the z-board, the upper heatsink is cool but the lower one is hot. So I suspected the y-board is bad, the z-board may be bad.
Search ebay and find the boards, wait.. too expensive ! and some one mentioned the y-buffer board would be broken if y-board was damaged !
I check carefully and found the top IC on the y-buffer board was burnt out! So need to replace the three boards (y-board and upper and lower y-buffer board) at the same time, total cost is around !250! and may need to replace z-board as well.
I abandoned due to high cost to fix the set.
I checked the panle number was LJ68-00168A, looks other model and other brand such as VIZIO, PHILIPS also use this panel, wondering if can buy the other models' parts which use the same panel to repalce the three board for lower cost..

[tom66]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

What are the part #'s on the boards in your TV? For example BN44-xxxxxx is usually used by Samsung for their LCD/Plasma lines.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

I'll check the Part # this evening.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Finally got the BN#:
Version: SN09

X-Main BN96-06091A
Y-Main BN96-06092A
Y-uPPER BN96-06093A
Y-Lower BN96-06094A

[tom66]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Well, if the TV works with no picture, but there are no shorts, I'm pretty sure it's not a Y-sus, Y-buffer or X-main fault. They usually load down the PSU and stop it powering up. Instead, I'd look at the control board or main board. Can't find those parts anywhere, except two of the X-main.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

I realized the set will powered down itself in 15 minutes.
The y-upper board has one IC was seen to be burnt.

[tom66]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Does it work without the Y upper installed?

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

It doesn't work with disconnect the upper buffer, I think the y-board was also broken before the three heatsinks not warm at all.

[tom66]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

I can't be sure, it just doesn't sound right to me, they almost always go short, but the upper buffer failing is odd I must admit.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Samsung plasma model number PH-T5040 , no picture has sound, open the back cover and test the Vs(207v),VA(64V),normal. The fuse on Y-Board (left sdie) and Z-Sustain(Right side) board, good.
However, when I touched the heatsink on the y-board, three of them were cool,the z-board, the upper heatsink is cool but the lower one is hot. So I suspected the y-board is bad, the z-board may be bad.
Search ebay and find the boards, wait.. too expensive ! and some one mentioned the y-buffer board would be broken if y-board was damaged !
I check carefully and found the top IC on the y-buffer board was burnt out! So need to replace the three boards (y-board and upper and lower y-buffer board) at the same time, total cost is around !250! and may need to replace z-board as well.
I abandoned due to high cost to fix the set.
I checked the panle number was LJ68-00168A, looks other model and other brand such as VIZIO, PHILIPS also use this panel, wondering if can buy the other models' parts which use the same panel to repalce the three board for lower cost..

Sorry the model # should be Samsung HP-T5054

[tw2005]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

I've fixed 3 Samsungs with this particular YSUS.

The ysus can be easily fixed and on all 3 of the ones I did it was the 88N30W FETs that get shorted.

All three had blown upper buffers, it's a common fault. Lowers on all mine were good.

I would check out all the other fets just in case as it's assumption you have the same faulted parts and of course ther could be an exception

They are cheap as chips to buy. I purchased mine on Ebay from the same seller, all were brand new and good.

If one shorts the remaining 3 will be shorted on the board so to find out exactly which one or how many you will need to remove and test individually.

From what i saw on my sets, yes you can get the voltages up, I could not get the set to run a picture with the upper removed and all 3 had blown upper buffer and dead ysus.

I think blown xsus is rare on these.

If your in the USA then I reckon you could get this up for under a $100 if you can handle a soldering iron.

Finding cheap buffers is probably the hard part, but what I did is use a different buffer part number which did work on this panel. S50HW-YB02

If you're interested in how I went about it and want to have a go at this let me know.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Hi thank you TW2005, your experience sharing is very appreciated, how ever I'm in Cadana, so may be hard to get it fix.because I can't replace the IC myself.
I attached the broken IC photo as well,it's thetop one onthe upper y-buffer board, other ICs looks no damage.

[tw2005]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Hi thank you TW2005, your experience sharing is very appreciated, how ever I'm in Cadana, so may be hard to get it fix.because I can't replace the IC myself.
I attached the broken IC photo as well,it's thetop one onthe upper y-buffer board, other ICs looks no damage.

Help me out, where's Cadana?

No we won't be doing surface mount chips like that. Hopefully some FETs on the YSUS and order some buffer boards.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Help me out, where's Cadana?

No we won't be doing surface mount chips like that. Hopefully some FETs on the YSUS and order some buffer boards.

I live in Vancouver, B.C. Canada. North America.

[tw2005]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

I live in Vancouver, B.C. Canada. North America.

Sounds like a very civilised part of the world then. So you have no electronics experience or soldered components before??

[tw2005]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

My idea is out the window. The guy that had those alternate upper buffers has been cleaned out, so to Shopjimmy.

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Sounds like a very civilised part of the world then. So you have no electronics experience or soldered components before??

Of course .

I can solder majoir components but not like IC chips which has 100s of feet.

[tom66]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Of course .

I can solder majoir components but not like IC chips which has 100s of feet.

It's not too difficult really. Practice on a dead motherboard.
http://www.youtube.com/watch?v=wUyetZ5RtPs
http://www.youtube.com/watch?v=5uiro...eature=related

I've never done it on a buffer, but I have done 64 pin chips on my home made boards.

[tw2005]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

Of course .

I can solder majoir components but not like IC chips which has 100s of feet.

Well, then you can fix the Ysus and purchase the buffer boards.

Here's the alternate boards I used. Essentially the same, I transferred the rubber blocks from the original boards to this and inserted the plastic pcb support standoffs.
Worked perfectly, even mixed 1 original and this one also no problem with the picture.

Upper: BN96-03361A,996500036824, LJ41-03882A

Lower: BN96-03362A , 996500036825, LJ41-03883A

Photos c/o Shopjimmy

[Sevenqi]

Re: Samsung PH-T5040 no picture but sound,high cost to repair!

It's not too difficult really. Practice on a dead motherboard.
http://www.youtube.com/watch?v=wUyetZ5RtPs
http://www.youtube.com/watch?v=5uiro...eature=related

I've never done it on a buffer, but I have done 64 pin chips on my home made boards.

64 pin chips ! my limit may only replace the STK moduler AMP IC before. Thanks Tom66.