Samsung UN55EH6000F Power issue
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Re: Samsung UN55EH6000F Power issue
I'm now just guessing at things and tested this resistor RP820 and out of circuit it's 0.11 but I can not find a chart online that the colors work with. Under the scope it looks black, gold, black, gray, black. but this comes as an error on the calculators.Comment
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Re: Samsung UN55EH6000F Power issue
The resistor is ok. That is the source resistor for the pfc mosfet.Comment
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Re: Samsung UN55EH6000F Power issue
I don't have a schematic, I am using the pictures of the board. I would try grounding the BLU_ON/OFF pin CNM803 pin6 and see if the B5v and B13v stay up
It might be that the backlight drive circuit is killing the B13v?Last edited by R_J; 02-03-2022, 03:45 PM.Comment
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Re: Samsung UN55EH6000F Power issue
So when the backlight circuit is turned on there is too much load on the supply, Back to post 1 where the two mosfets were replaced, It could be that they are being turned on hard and killing the supply. There are also a pair of dual diodes, DL851 & DL852, I would check them as well
This is a guess but it might be caused by open led's in the panel and the board is shutting down due to an over voltage on the led supply.Last edited by R_J; 02-03-2022, 04:05 PM.Comment
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Re: Samsung UN55EH6000F Power issue
What voltage do you get on JP840 when the backlight circuit is enabled (BLU_ON/OFF ground removed) Does it jump up to 300vdc? or is it higher? If it jumps up higher, connect the backlights and check the voltage again.Comment
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