samsung ps51d6900 dead

[stockers]

hi all

i have a samsung ps51d6900 that seams dead.
i tested the output of the psu and im not getting any vs or va output even tho the ps on signal is present.

because of this, i bout a new psu. but iv got the same symptoms.
the red light on the front flashed with presses of the button but iv got no green led on the small logic board.

any ideas people???

thanks in advance

[Hamie]

Re: samsung ps51d6900 dead

Unplug the x and y sus.

Does it turn on?

[stockers]

Re: samsung ps51d6900 dead

if x and y sus are disconnected, there is 10.6v on va but 0 on vs. if just x sus is unplugged, i get the same 10.6 and 0v

[Hamie]

Re: samsung ps51d6900 dead

Is the power supply bn44-00446A?

[stockers]

Re: samsung ps51d6900 dead

yes, thats the one

[Hamie]

Re: samsung ps51d6900 dead



Ok put a jumper between ps-on and gnd.

And vs-on and stby

[stockers]

Re: samsung ps51d6900 dead

ok, did that and got vs and va voltage as it should be. connect y sus, fine. connect x sus, clicks on and of a few times then shuts down

[Hamie]

Re: samsung ps51d6900 dead

Have you soldered the jumpers or just used wires in the plugs?
Ie is the main board still connected?

[stockers]

Re: samsung ps51d6900 dead

i used bits of wire

[stockers]

Re: samsung ps51d6900 dead

no, the main board was disconnected

[Hamie]

Re: samsung ps51d6900 dead

Do you see a service vs test point on the y-sus.
What's the reading?

[stockers]

Re: samsung ps51d6900 dead

that reads 207v which is same as on the label for the panel

[Hamie]

Re: samsung ps51d6900 dead

Finally check the vsc and -vy voltages.
Voltages for these should be on the sticker, 190v -190v roughly.

You should also have sound with the x-main disconnected.

If you do, y and buffer are probably good, replace the x.

[stockers]

Re: samsung ps51d6900 dead

all voltages good. why would the led on the main board not be lighting up? does the dead x sus cause this? would it also cause there to be no vs or va voltage even when its disconnected (and no jumpers) ???

[stockers]

Re: samsung ps51d6900 dead

i am indeed getting sound...

[Hamie]

Re: samsung ps51d6900 dead

The led should blink like a heart beat. Once every couple of seconds.
If it doesn't i.e. is permanently on or blinks really slowly or really fast usually indicates a fault.

Hopefully though by replacing the x the problem is solved.
Also when you replace the x, if all is good and the tv is working, check to see if there is a firmware update from samsung and update the tv via USB.

[stockers]

Re: samsung ps51d6900 dead

there is nothing from the led. does not blink at all. would it be worth replacing the main board aswell?

[Hamie]

Re: samsung ps51d6900 dead

Id just replace the x. Doubt there is any other problem.

[Heerh]

Re: samsung ps51d6900 dead

Hi Hamie,
I have the same TV model and the it doesn't start and there is no sound as well. the standby light blinks 6 times then nothing happen.
I opened the back plate and I can hear a buzzy noise ( its not very loud), I think the noise comes from the small white transformer on the power supply board. I'm not sure if that's causing the problem or there is something else. I was looking for a new transformer but I cant find it any where! any advise please?

Thank you