Samsung PN43D450A2D Picture is Distorted

[pc_doc_al]

My Samsung PN43D450A2D has a distorted picture. If there is no motion on the screen it looks good. Sometimes you can see the previous channel bleeding through. When I received the TV it would not power up. I have repaired the X-Main board and upgraded the firmware to the 1006.6 version. I have uploaded a couple of pictures.
Thanks,
Steven

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

On the back of the plasma panel (inside the TV), there is a sticker with Vs, Va and Vsc written on it, near SAMSUNG logo and part #. What does it say?

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

Vs 205
va 58
Vsc -180

PP42AF085, 42DH

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

OK, there are various test points on the power supply for checking these voltages. You will need a digital multimeter, do you have one?

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

Yes I do.

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

Can you post a picture of the power supply board?

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

Here you go.

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

OK.
Set your multimeter to the highest dc range.
The black probe should be placed on the chassis somewhere.
The red probe should be placed on the red ringed point, the measurement recorded (Vs), then move to the blue point and record the measurement (Va).

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

red (Vs) 204
blue (Va) 57

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

Close enough. Can you provide a picture of the Y-main board? This is on the left hand side of the TV, looking from the rear.

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

Thanks

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

OK, here is where to test VSCAN (Vsc), test in the same way as Vs/Va tested.

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

Ok I will post it tomorrow.
Thanks

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

It reads -178 (negative)

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

Close enough, then. Do you see any points for Ve? I am thinking your new X-main is defective but I'm not certain.

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

it reads 90

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

Although that is not specified, it sounds about right for this panel. I would consider replacing the X-main again; if not, there's a possible problem with the control board.

[pc_doc_al]

Re: Samsung PN43D450A2D Picture is Distorted

ok thanks. I replaced some components on the X-Main and did not replace it. That may be my problem. Thanks for your help.

[tom66]

Re: Samsung PN43D450A2D Picture is Distorted

Ah, in which case, what parts did you replace?