Samsung 32" ln32b360c5d

[Blagus]

Re: Samsung 32" ln32b360c5d

As I said, the lamps light up for a second and during that period I don't see anything suspicious. But I can't trick the driver to keep them on. FB line stays low all the time, and B line drops from 3,1-3,3 V to 0 when the lamps shut down.

[Dumah Brazorf]

Re: Samsung 32" ln32b360c5d

Not enough to say lamps are ok.

[budm]

Re: Samsung 32" ln32b360c5d

So the PFC Boosted Voltage stays close to 400VDC. We also need to see the pictures of your BN44-00289A since the pictures I have for the 00289A has D805.
did you also check the resistance of the high Voltage windings of the inverter transformers?
Is the PWM IC UI801 OZ9938GN?

[Blagus]

Re: Samsung 32" ln32b360c5d

Sorry for the delay.
The pics are on the Drive, here: https://drive.google.com/open?id=0B_...DFLSy14MEh6aG8
There's no DP805 on the board. It's not present in your 00289A schematics posted a few pages back neither.

I'll check the resistance and get back with readings.

[Blagus]

Re: Samsung 32" ln32b360c5d

Update:
I measured the resistance across the transformer outputs, 3 read ~1.04 kOhm, one was 2.05 kOhm.
In addition to that, I played with INV_ONOFF and DET_5V lines again, and suddenly, all lytics started "screaming", transfering the oscilations to the transformers as well, and backlight turned on at about 10%. It was unstable and flickering, and changing "Backlight" setting in the menu made it go crazy, randomly going from 0 to 20%.

5 minutes of rage later, this was the result:


I'll get the LED stripe and hack it to power on via INV_ONOFF line and get back with the results.

If anyone needs 4 working CCFL tubes, just pay the shipping and one beer and they're yours.

[Blagus]

Re: Samsung 32" ln32b360c5d

I successfully replaced CCFLs with LED strip and disabled the entire CCFL HV circuit. I made a new thread with description.