I got in a Samsung UN55EH6000F with no power and blown fuse on the board (BN44-00499A) I found 3 bad mosfets and a blown resistor circled in the pictures. Now just putting power to the board and checking voltages I get what I need 13v then goes off and on over and over. I connected to TV and TV powers on with sound then off over and over again. I did not include pics of the TV since it is in the power board. So what would cause it to power on and off repeatedly? ?
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Samsung UN55EH6000F Power issue
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Re: Samsung UN55EH6000F Power issue
Originally posted by R_J View PostThat looks like a gate drive resistor, I would check the zener diodes and the other resistors in that drive circuit.
One of the components you have circled is the standby ic, was it replaced as well?
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Re: Samsung UN55EH6000F Power issue
Looks to be an NPN. If it is sot-23
WR 2PD602R Si-npn GP, Sw, 60V, 500mA, 250mW, B=120..240, >160MHz SOT-23
If you have a component tester, just remove the other one and check it.Last edited by dskall; 01-26-2022, 03:39 PM.I assume no responsibility for any stupid suggestions I might post.
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Re: Samsung UN55EH6000F Power issue
UPDATE: Same thing. 13v then zero just keeps doing it over and over. I was looking it all over again and see a tiny crack in the big green thermister wtr15d050 but I get 8.3 ohms cold so not sure if the crack means damage or not?Last edited by CraigR; 02-03-2022, 10:57 AM.
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Re: Samsung UN55EH6000F Power issue
Originally posted by CraigR View PostYes it is.
CNM803 pin 14 is PS_ON/OFFLast edited by R_J; 02-03-2022, 01:42 PM.
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Re: Samsung UN55EH6000F Power issue
Originally posted by R_J View PostThe first thing I would try is to connect the PS_ON/OFF pin to ground, this should place the power supply in standby mode, then you can see if the standby voltage A5V is stable.
CNM803 pin 14 is PS_ON/OFF
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