Samsung le46b530p7w

[diif]

Re: Samsung le46b530p7w

Thanks for that, very helpful. I'll check the resistance first to rule out the transformers then try that test.

[diif]

Re: Samsung le46b530p7w

I'm not sure there's any power getting to the balancer. I've tried the test on the video and I get 0v.
Ive measured the voltages on the connector to the mainboard.
5V_DET 2.8v
E-PWM 1.7v
INV-ON 5.1v
13v 12.78v
5.1v 5.2v

I'll try it with the jumper wire soldered back on.

[budm]

Re: Samsung le46b530p7w

Is your power supply/inverter combo board Samsung BN44-00265a/b>?
CNI803 (12V/FB/GND/LD) on the power supply/inverter board has 12V output to run the error detection circuits on the balancer board.

[diif]

Re: Samsung le46b530p7w

Is your power supply/inverter combo board Samsung BN44-00265a/b>?
CNI803 (12V/FB/GND/LD) on the power supply/inverter board has 12V output to run the error detection circuits on the balancer board.

Yes, it's a BN44-00265B

0v on the 12v pin of CNI803

[budm]

Re: Samsung le46b530p7w

OK, we need to get that 12V feeding the Balancer board. That 12V is tested with the TV turned on , right?
Also the Voltages at the connector that goes to the main board are present, right?

[diif]

Re: Samsung le46b530p7w

Yes, measured with the TV on it's measuring 0.1v not the 0v i previously though.
All voltages present on the connector to the mainboard post#142.

[budm]

Re: Samsung le46b530p7w

Yes, measured with the TV on it's measuring 0.1v not the 0v i previously though.
All voltages present on the connector to the mainboard post#142.

Since you do have 13VDC but no 12VDC to feed the Balancer detection circuit, I suspect that you may have bad 12VLDO regulator ICI808 (I think it is '8' not '3') which fed by 13V and the output is 12VDC, see schematic page one regulator block, so find out if you have 13V at input or not, and verify that the resistance between Gnd and the OUTPUT PIN does not have low resistance of <100 Ohms.

[diif]

Re: Samsung le46b530p7w

Since you do have 13VDC but no 12VDC to feed the Balancer detection circuit, I suspect that you may have bad 12VLDO regulator ICI808 (I think it is '8' not '3') which fed by 13V and the output is 12VDC, see schematic page one regulator block, so find out if you have 13V at input or not, and verify that the resistance between Gnd and the OUTPUT PIN does not have low resistance of <100 Ohms.

Thank you, I was thinking the same. I've just got to find it now !

[diif]

Re: Samsung le46b530p7w

IC 1803 isn't fitted and it doesn't look as if it ever has been. Looking under the microscope I see that R1829 and R1830 are burnt up. I've only got 10ohm in 3216, ok to try you think ?

[diif]

Re: Samsung le46b530p7w

Yes, the TV is on
Thank you for your help as always budm.

[diif]

Re: Samsung le46b530p7w

Photos of the missing regulator and burnt resistors the other side.