Samsung PS51E450 Plasma Problem.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Do them now and then, check ubuntututorials channel for the occasional repair.

Yep, that's a solid short there.

You will need to replace the buffer board or the IC on the buffer.

However, please note... It is possible for a bad plasma panel to kill your buffer board. Please check the edge and centre of the panel glass very carefully for chips or cracks. On these newer panels, it is possible to crack the panel and still get light out of it. However it will quickly fry the buffer board leading to no picture at all.

Also inspect the ribbon cable for tears or breaks.

Also, it is possible that if you receive a new buffer board from a cracked panel, it may be bad. As most sellers do NOT test them despite their claims to the contrary... Perform the short check on your new board before installing it, that way you can be certain your Y-main or panel is not killing boards. (I would not expect the Y-main to kill these boards but it's worth being cautious.)

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

Ok Tom thanks will order a new buffer and do test before installing.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

I was looking closely at your video again.
This section of the screen never lights up during the flash.
Is it definitely not cracked on the edge? Cracked areas of plasma panels will not light up.
You may want to check under the frame of the TV.

Also, where is the buffer IC that failed - what part of the screen was it on? Same area which did not light up?

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

Tom. very well noticed. you have have slow motion that video right down lol.. very small crack on screen... waste of a good TV again.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Damn. That sucks. Well, at least most of the boards are OK. As a test, you can hot air that bad buffer IC off, and see if you get a part picture. That will tell you the rest of the boards are good.

Recently I got a 50" LG FHD plasma TV (2012 model like this) and it had a bad plasma panel too, due to a tear in the Y-buffer ribbons.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

Damn. That sucks. Well, at least most of the boards are OK. As a test, you can hot air that bad buffer IC off, and see if you get a part picture. That will tell you the rest of the boards are good.

Recently I got a 50" LG FHD plasma TV (2012 model like this) and it had a bad plasma panel too, due to a tear in the Y-buffer ribbons.

ok Tom thanks. its a waste of good TVs, i know im slow at doing it but like to try my hardest to repair so they are not going to waste or ending up in Landfills.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Me too, but due to the extremely high failure rate of panels in the newer models of TV, I stick to the older ones, such as Panasonic PZ80s. (Note that it's quite possible the panel cracked on its own, it is a well known problem with Samsung TVs.)

The huge number of panel failures will be the death of the TV repair industry -- thankfully I'm not going that way but I feel sorry for other TV techs.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

interesting.... anyways got 2 sony bravia LCDs to repair so you will probably be seeing my posts lol... just out of curiosity what do you prefer to repair plasma or LCD ? i prefer LCD myself.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Plasma by far... too many panel issues with even older LCDs.

Good oscilloscope and a bit of prior experience and you can fix 99% of plasmas.

I've only got two bad panel plasmas out of 19 so far... And both weren't serious just pixel wide lines so sold them for a little less with no difficulty at all. I've had far more bad panels with LCDs and they are unrepairable in many cases.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

ahh i see... yeah i repaired a plasma a year ago or so had a pixel wide line.. still got £150 on it though. dont realy like selling tvs that high in price but if someone comes along n offers it then why not...

[tom66]

Re: Samsung PS51E450 Plasma Problem.

Well, keep an eye out for PZ80s. Tonight, I just fixed my 7th. I paid less than £50 for it and sell them for around £200 each. 42" FHD 1080p plasma. Takes about an hour to do the fix. Awesome picture. And after you complete the repair you can be more or less assured that it will last 10+ years without fail.

I've done
Panasonic TH-42PZ70BA - Sus PASS FET shorted £3 to fix
Panasonic TH-46PZ80B - Loose LVDS cable
Panasonic TH-42PZ8BA - 10 blinks SOS (with friend - MC module cap)
Panasonic TH-42PZ81B - 10 blinks SOS (with friend - MC module cap)
Panasonic TH-42PZ80B - Dead - AC detect fault
Panasonic TH-42PZ8BA - 10 blinks SOS (with friend - MC module cap)
Panasonic TH-42PZ70BA - 10 blinks SOS (transformer thermal fuse)
Panasonic TH-46PZ82B - 2 blinks SOS (with friend - MC module cap)
Panasonic TH-42PZ85B - 10 blinks SOS (with friend - MC module cap)

Older Panny plasmas - so easy to fix & so, so well made!

Still waiting for the illusive 50" or 58" Panny PZ80...

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

is that from the vierra range. im sure i had one of those not too long ago.

[tom66]

Re: Samsung PS51E450 Plasma Problem.

is that from the vierra range. im sure i had one of those not too long ago.

Yes they are all Viera although that is just a name like AQUOS, REGZA, etc.

[Mikeyboy2007]

Re: Samsung PS51E450 Plasma Problem.

ahh i see.. anyways Tom thanks for your help im sure we will speak again very soon lol

[sordids999]

Re: Samsung PS51E450 Plasma Problem.

Hello

got this tv today was told no picture but sound so when i first when first switched on i have a loud buzzing sound coming from the panel all voltages
VS/VA/VE voltages are all good including the YSUS AND XSUS
control board led flashing ok

could it be the panel ? and i have also checked the screen for cracks but cant find anything

thanks

[ReeceyBurger123]

Re: Samsung PS51E450 Plasma Problem.

Hello

got this tv today was told no picture but sound so when i first when first switched on i have a loud buzzing sound coming from the panel all voltages
VS/VA/VE voltages are all good including the YSUS AND XSUS
control board led flashing ok

could it be the panel ? and i have also checked the screen for cracks but cant find anything

thanks

Wouldn't surprise me the E series is absolute shit. The panels are total trash. Look at the drive lines do any look odd like they have been pushed down inside the glass ?

[Alastair E]

Re: Samsung PS51E450 Plasma Problem.

Buzzing and no picture with all voltages correct indicate the plasma panel is down to air.
--Unrepairable unfortunately...
--Check for cracks--especially round tip-off...

[shani]

Re: Samsung PS51E450 Plasma Problem.

Hi Guys

I am having a same problem with my Samsung Ps52E450 , All the voltages are Ok on Ysus Power supply and Xsus board. Logic board light is flashing every second. Back light and audio is also working but no picture. I think it might be a main board. i don't know how to test the main board. can someone plz help me with this. Thank you.

[dick_barton]

Re: Samsung PS51E450 Plasma Problem.

Run the screen pattern test. Disconnect the mainboard from the logic board and short together the two pads Auto_Gen then switch on.

If you have the test patterns then it would look like a main board fault.

Posting pictures of your circuit boards and giving the voltages you read is always a useful starting point.