Samsung PN50b550T2FXZA Y Sus BN96-09744A

[R1racer]

Please help me trouble shooting this BN96-09744A , BOARD NUMBERS: LJ41-06153A, LJ92-01611A, 611A on sticker . I have sound after replacing the main board with supposedly brand new boar ordered directly from Samsung parts .. Vscan show the correct voltage .That's all i know how to test ..

Thank you

[jose6326]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

you need to post clear pictures of the board layout of each individual board

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A



New Main


Logic


SMPS



X sus


Y sus





Buffer

[Hamie]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Short out pins 3 and 4 of the little black square located here:



Disconnect the LVDS cable (the one that connects the control Board to the main board.

Power on the tv.

Do you get test patterns?

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Disconnect the LVDS cable (the one that connects the control Board to the main board.

Short out pins 3 and 4 of the little black square located here:



Power on the tv.

Do you get test patterns?

I will check when i get home .Just curious What will the result proof

[ReeceyBurger123]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Control board, in the centre of the Tv has lots of white ribbon cables coming out of it going to the panel and sustain boards.

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

I disconnected the Ribbon cable that connect the Main to logic

Shorted Pin 3 and 4 on the Logic board

Powered Set on and still received Black screen no test pattern ..What that mean

[Hamie]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

It means that there's a good chance that the mainboard is working.
If you got test patterns then your new mainboard would be faulty.


In a dark room, Does the panel glow?

[Hamie]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Is there a LED on the control board?
If so Does it blink every second or every 6 seconds?

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

It means that there's a good chance that the mainboard is working.
If you got test patterns then your new mainboard would be faulty.


In a dark room, Does the panel glow?

The Panel Does not glow .. Total Black out to say

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Is there a LED on the control board?
If so Does it blink every second or every 6 seconds?

Yes there is a green LED and blinks every second

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

It means that there's a good chance that the mainboard is working.
If you got test patterns then your new mainboard would be faulty.


In a dark room, Does the panel glow?

Was i suppose to connect the main board back after jumping pin 3 and 4 .

https://www.badcaps.net/forum/showthread.php?t=26790

Mentioning that on post #2 ...

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Any one have other test suggestion to determine which board / component the cause of my problem .

[Hamie]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

what voltage do you have for

VSCAN
VSCH
(located y-sus)

VE
{located on x-main)

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

I will tackle it when I get back in town and post the reading


It's good to take a break

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

what voltage do you have for

VSCAN
VSCH
(located y-sus)

VE
{located on x-main)

Here is the result With the Set On

Vscan =-199 to -201 V

VSCH = ???? Could not find it

VE= 84 V



Also i have a q on previous test i performed DO i need to keep the main disconnected when i power the set during shorting pin 3&4 on the logic

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Any One ....!

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

Any One ....!

bump

[Hamie]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

I repaired a Samsung PS50B430 TV that internally looks almost identical to this.
Same symptoms, good vs va vsc and ve.

Luckily though I had a spare control board from a PS42B430 lying about.

Changing the control board fixed the problem.

Basically you will need a scope to troubleshoot this further,
or take a chance and buy a control board.

[R1racer]

Re: Samsung PN50b550T2FXZA Y Sus BN96-09744A

I repaired a Samsung PS50B430 TV that internally looks almost identical to this.
Same symptoms, good vs va vsc and ve.

Luckily though I had a spare control board from a PS42B430 lying about.

Changing the control board fixed the problem.

Basically you will need a scope to troubleshoot this further,
or take a chance and buy a control board.

So what you saying is there a good chance that My Logic board is gone even with the Green LED flashing .?


I am trying to understand is the VSCAN voltage is the only way to tell if the Y main is bad ?

I also have access to scope but what should i do or test , Simply not sure what to look for



I found this video as well and done all the steps except at Minute 3:26 where i was suppose to get test pic i did not see any thing displayed on the screen at all ,

https://www.youtube.com/watch?v=JjrwTZC5nVg