Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

[Ken Laszlo]

Hi everyone

I'm trying to repair my Samsung 50 inch plasma set, that has a pattern of one (or sometimes two) flickering vertical lines across the entire screen.
Note that this is intermittent - Sometimes the fault disappears completely and the set operates normally - Of late, though, the fault appears more often than not. Yesterday the patterns of lines was always there and has become enough of an annoyance to demand a fix or replacement.

What I've done so far.
Cleaned all the connectors with alcohol and reseated them all. It didn't help.
Pressed/wiggled many connectors and boards to see if the fault goes or changes in some way to try to track down the fault. It didn't help. I couldn't identify anything.
I especially checked the cabling and connectors between the main board (bottom right) and the control board in the centre. Nothing changed though.

Could any help me further with this, please?

Thank you
Ken

I attach a few useful photos of the fault, the inside of the unit and the unit's specs.

[Andrew F. Ali]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

That appears to be a Main Bd issue. Look for cold solder joints and reflow them.

[Ken Laszlo]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

Hi Andrew
Thank you for your reply and advice.
I'll remove the main board and check it over - I'll report back.
Ken

[R_J]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

Have you tried going into the service menu, pdp option sub menu, and access the Pattern select submenu, if the patterns or ok it is likely the fault is on the main.
I'm not 100% sure but you may be able to run the autogen on this logic board with the main disconnected.

[Ken Laszlo]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

I'm not 100% sure but you may be able to run the autogen on this logic board with the main disconnected.

Thank you for your advice, R_J - Yes.

I searched around on the net and found this video detailing just that!
https://www.youtube.com/watch?v=JjrwTZC5nVg

Running the patterns (with the main board disconnected) still showed the exact same line problem.
Would this lead me (us) to suspect the small logic board is faulty perhaps?
I've cleaned and reseated all the cables and don't suspect any are bad from visual inspection.
No amount of wiggling or flexing of the logic board or cables (in an attempt to check for loose connections or dry joints) changes anything - The fault is always there.

Thank you
Ken

[R_J]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

About the only way you would see where the problem is coming from is with a scope, without a scope you would need to sub out the boards, it is likely control board or Ysus.

[Ken Laszlo]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

Forgive my ignorance here, but since the unit has vertical lines (i.e. lines being generated along the X axis), why would you consider that the Ysus board is the problem?

Thanks
Ken

[R_J]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

The noise that is being generated is high frequency and is effecting the scan signal so each line of video signal also carries the noise spikes. and is displayed on each line from top to bottom. or
It could also be caused by the control board and effect the x drive, again without a scope how do you know.

Have you removed the y & z boards and cleand the ground connections? Inspect them and see if there is any black corrosion at the ground connections. also check for any poor solder connections.

[Ken Laszlo]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

Thanks for your reply.

I've checked both X and Y boards - All good - No dry joints as I can tell. In fact, the set is in very good shape, despite being 9 years old.

I will get the control board changed - It's very cheap.
If that doesn't effect a fix, I can look into other things.

Ken

[Ken Laszlo]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

I reflowed the entire Y-Sus board, even though there were no obvious signs of dry joints.

In operation, the set does have a slight 'buzz' sound that seems to be coming from a KF13N60 MOSFET on this board. Is this normal?
The MOSFET does appear to have seen some 'action' (slight brown discolouration).

Thank you
Ken

[Taterbug]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

I just picked up a set with the exact same problem. Did you ever find what the culprit was?

[satyajit sarkar]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

replace tcon pcb

[RJARRRPCGP]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

replace tcon pcb

It's not an LCD.

[Taterbug]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

Replaced the t-con board and that fixed the problem. Thanks

[ZAINABALDHAIF]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

Hello..I have a problem with the Smart TV..The type of Supra TV..Do you have any software for Supra TV..55 inches

[ZAINABALDHAIF]

Re: Samsung 50 inch Plasma PS50B430 - Vertical lines - Help please

hello..i have a problem with the smart tv..the type of supra tv..do you have any software for supra tv..55 inches