Samsung PS51D550 no picture!

[Tolmulest]

Re: Samsung PS51D550 no picture!

Okay i already found a x main replacement board for good price :P

Is it normal that i hear loud buzzing at the bottom of the screen when i try to turn it on ?

[mmartell]

Re: Samsung PS51D550 no picture!

With a dead short Vs to ground you should have had a blown fuse. Did you ?

[Tolmulest]

Re: Samsung PS51D550 no picture!

Well i cant find anything that looks like a fuse :S
https://flattvparts.co.uk/images/sam...50DH-DF_XM.jpg
Can you tell where is the fuse?

[tom66]

Re: Samsung PS51D550 no picture!

You cannot use 720p board in this 1080p set. Be careful: the 720p board has less components and will not work in this TV, this is probably the part you have found, the 1080p board is unobtanium.

[Tolmulest]

Re: Samsung PS51D550 no picture!

i have a little different board! I took this picture from google bacause they look the same(Maybe little different) to know what does the fuse look like and where its located.

I have still the original board what came with the tv!

[tom66]

Re: Samsung PS51D550 no picture!

There is no fuse on these boards. Only a few older plasma TV boards use fuses.

[Tolmulest]

Re: Samsung PS51D550 no picture!

So i just need new board?

[tom66]

Re: Samsung PS51D550 no picture!

Have you checked for shorts on the current board? Did you find any?

You will be lucky to find a replacement board. I think repair is the only way. Many of these are failing recently, probably 5 on here last month alone.

[Tolmulest]

Re: Samsung PS51D550 no picture!

Where/How should i start looking?
From Voltage regulators attached to radiators?

[mmartell]

Re: Samsung PS51D550 no picture!

Tom he says in post 18 he has a Vs-ground short on xmain.

[Tolmulest]

Re: Samsung PS51D550 no picture!

So i measured the resistance between VS and ground again, and on a 2000ohm scale it doesnt show resistance but if i change the range to 200k ohm the resistance keeps rising (Loading caps?)

[tom66]

Re: Samsung PS51D550 no picture!

You need to tell us what you mean by "shows resistance", is that a low number few ohms, or slowly increasing, or single "1" meaning open circuit.

[Tolmulest]

Re: Samsung PS51D550 no picture!

If i measure With 2000ohm range it shows single 1
If i switch to 200k ohm range its slowly rising.

[tom66]

Re: Samsung PS51D550 no picture!

Ok, that is not shorted, that is measured on X-main from Vs to GND?

[Tolmulest]

Re: Samsung PS51D550 no picture!

Yes! If i try to turn the tv on i see little white flashing on the bottom of the screen for a second

[tom66]

Re: Samsung PS51D550 no picture!

Are there absolutely no cracks on the screen itself?

[Tolmulest]

Re: Samsung PS51D550 no picture!

There is 1 inside the screen i cant feel it with finger but i can see it.
The tv worked after the crack.

[tom66]

Re: Samsung PS51D550 no picture!

This kills the panel. Sorry, but the crack is triggering a control board shut down due to Y-buffer short. Usually non-repairable.

You can try replacing the Y-buffer board but it will probably die again very quickly

[Tolmulest]

Re: Samsung PS51D550 no picture!

I have already replaces y buffer(its the long one in left side) but still no pic. You sayd ppanel is usually nonrepairable is there a way?

[tom66]

Re: Samsung PS51D550 no picture!

Usually non-repairable in that if it has actually cracked and broken the electrodes then no it's not repairable. In a few cases the crack does not cause any permanent harm but the impact might have damaged a board due to a temporary transient short or panel change.

Unfortunately from what info you have provided this is almost certainly caused by the crack in the panel and it won't be fixable, sorry.