Samsung UN70KU6300F tv troubleshooting

[Kel65]

Re: Samsung UN70KU6300F tv troubleshooting

Another there, make sure you remove the screws holding where the power plug goes into the board if there is one, see how he does it there: https://www.youtube.com/watch?v=uOr8rLj_rTk

Thanks. That's the one. The first video I watched didn't do anything with those screws. Glad I didn't slam it too hard.

I took the power board out and looked at the back to see if anything looked fried. I didn't realize there was so many components on the back, and small. Couldn't see anything obvious. Tomorrow I will take some measurements.

Thanks for the help everyone. Maybe by the time I am done I will have spent enough in parts to have just bought a new tv

[nomoresonys]

Re: Samsung UN70KU6300F tv troubleshooting

While your back there look the solder joints over closely, reflow any that look suspicious, being careful not to bridge anything, examples of bad joints there: https://www.google.com/search?client...h=599&dpr=1.09

[nomoresonys]

Re: Samsung UN70KU6300F tv troubleshooting

Simple test, with tv unplugged check every diode on top of the board, meter in diode mode.

[Kel65]

Re: Samsung UN70KU6300F tv troubleshooting

I think I will just focus on the outputs again to make sure I didn’t measure something incorrectly before. My eyes and soldering skills aren’t good enough to replace components. I just don’t want to foolishly replace a board that doesn’t need to be although I understand in this situation it may happen anyway.

[nomoresonys]

Re: Samsung UN70KU6300F tv troubleshooting

Well even if you don't replace on component level, the simple testing is to see if you find a bad component, then you can feel better about which board you need to replace, if it is a bad board.

[Kel65]

Re: Samsung UN70KU6300F tv troubleshooting

Measurements once again for CNM803 show a good ground for pins 10, 11, and 12. Measurements on the other pins fluctuate so fast I can't get an accurate reading. Best I can tell is that the best pins top out at 6.x volts and then drop back down. I tried to see if the fluctuations varied with the backlighting flashing at 1 second intervals but could not definitively say. None of the voltages were really stable enough to be sure what the actual reading is. This is with the output cable from the power supply to the main board disconnected. Using a mounting screw for the ground which seemed to work fine for continuity so I would hope it was sufficient for power.

Think I'm going to throw the power board at it now since I've had my fun trying to dig in deeper. Figured I would learn more by continuing to troubleshoot but I think the main thing I've learned is I forgot more than I ever knew.

There's a reason I have stayed away from free tv's. We have just become attached to this thing sitting in the living room so I'll drop a little money on it.

[nomoresonys]

Re: Samsung UN70KU6300F tv troubleshooting

I think the problem is the powerboard too.

[Kel65]

Re: Samsung UN70KU6300F tv troubleshooting

Success! $80 power board. Thanks everyone for the tips

[nomoresonys]

Re: Samsung UN70KU6300F tv troubleshooting

Glad to hear it, thanks for followup.