Hello all,
I am new to the community and very new to electronic repair. However, I am very patient, a good listener and willing to learn.
I have a Samsung LN40B500P3F that just powered off when I was in the middle of watching House of Cards Season 2.
I opened it up and checked the fuses. The 250v 3.15 Fuse was blown when I tested it with my dmm. I went to Radio Shack just to try to put a new one. They only had a 125v 3.15 fuse that was clear, but the employee said it should work fine. I put it in and it immediately blew when I connected power (as expected). I read up on testing N channel MOSFETs using a dmm. I got the datasheet online after looking up the number (F22nm60n)- http://www.alldatasheet.com/datashee.../F11NM60N.html. Three of the N channel MOSFETs read 558 or 559 on the diode setting. Two of them appear to be faulty and set off the auditory alarm on my dmm. I assume this is part of the problem with the power supply/inverter board, but I don't know what else to test from here. I am fine with just buying a new board if, but would like some advice if there is another less expensive solution. I saw this repair kit on ShopJimmy, but I am not confident enough with my soldering skills yet- http://www.shopjimmy.com/samsung-bn4...repair-kit.htm. I also want to verify that it is indeed my power supply and not my main board. I assume it is with the FETs testing bad, but I am new to this whole repair bit and am looking for advice/help.
I read on these two threads and performed the reccomended tests- https://www.badcaps.net/forum/showth...ng+LN40B500P3F - Same results: No readings when testing the 4 points recommended by budm at OHM mode at 200K. I have not done the light bulb test.
I also read this thread, but I am not sure it applies to my problem-
https://www.badcaps.net/forum/showth...LN40B500P3FXZA
There were a few other threads that I read, but I figured I just needed to start a new one. Thanks for looking and helping.
I am new to the community and very new to electronic repair. However, I am very patient, a good listener and willing to learn.
I have a Samsung LN40B500P3F that just powered off when I was in the middle of watching House of Cards Season 2.
I opened it up and checked the fuses. The 250v 3.15 Fuse was blown when I tested it with my dmm. I went to Radio Shack just to try to put a new one. They only had a 125v 3.15 fuse that was clear, but the employee said it should work fine. I put it in and it immediately blew when I connected power (as expected). I read up on testing N channel MOSFETs using a dmm. I got the datasheet online after looking up the number (F22nm60n)- http://www.alldatasheet.com/datashee.../F11NM60N.html. Three of the N channel MOSFETs read 558 or 559 on the diode setting. Two of them appear to be faulty and set off the auditory alarm on my dmm. I assume this is part of the problem with the power supply/inverter board, but I don't know what else to test from here. I am fine with just buying a new board if, but would like some advice if there is another less expensive solution. I saw this repair kit on ShopJimmy, but I am not confident enough with my soldering skills yet- http://www.shopjimmy.com/samsung-bn4...repair-kit.htm. I also want to verify that it is indeed my power supply and not my main board. I assume it is with the FETs testing bad, but I am new to this whole repair bit and am looking for advice/help.I read on these two threads and performed the reccomended tests- https://www.badcaps.net/forum/showth...ng+LN40B500P3F - Same results: No readings when testing the 4 points recommended by budm at OHM mode at 200K. I have not done the light bulb test.
I also read this thread, but I am not sure it applies to my problem-
https://www.badcaps.net/forum/showth...LN40B500P3FXZA
There were a few other threads that I read, but I figured I just needed to start a new one. Thanks for looking and helping.
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