samsung UE40EH6030WXXN not working

[anno]

i have a samsung UE40EH6030WXXN that is not working. led blinked 4 times.
i changed the power supply BN44-00552A but still the tv is not working.

the power led is blinking 4 times (if i`m correct)
the ps-on signal is coming to 3.3v , the psu voltages are correct. But then the ps-on signal is going to 0v. When i disconnect the TCON cable from the mainboard the ps-on signal is staying stable at 3.3v . But nothing happens. no backlight or image.

i tried to find a short on the TCON . I connect 12v external power supply to the fuse of tcon, but there is no short. it is taking 200ma.

mainboard is bn41-01894a
anyone can help?

[paulstef]

Re: samsung UE40EH6030WXXN not working

If you had an oscilloscope you could measure output voltage on the PSU LED connector. I had a few of these TVs with burnt LEDs.

[dick_barton]

Re: samsung UE40EH6030WXXN not working

Have you checked the Tcon fuse is OK and not open circuit?

Edit
Sorry, not open if current flowing. Have you checked any voltages on the Tcon board which may be marked eg VCC_1.2V, HVIN_12V, HAVDD, AVDD etc

[anno]

Re: samsung UE40EH6030WXXN not working

The Tcon fuse is ok. How to check the PSU LED connector. i have a scope.
which pins i have to check?

[dskall]

Re: samsung UE40EH6030WXXN not working

I would be checking for the various voltages on t-con

[riogrande75]

Re: samsung UE40EH6030WXXN not working

Hi!
I know its quite a long time ago, but I just ask: Do you still have a close picture of the mainboard (BN41-01894A)? I need to know the type of IC 204 near the connector to the power supply board.
Thx,
Rio