Re: Samsung UN58H5202 will not turn on. Help!

Hi all,

I could not see the part number on the mosfet itself so after some searching online I found it could be BN81-04745A. Plus I need to check Q9101c and see if that is okay. Add a fuse thats needed and shipping costs, am I better off just buying a new board for $45.

However if I buy a new board and it burns out again due to bad LED strips, I am more $ into the repair.

I was thinking of maybe buying a new board and then turning down the LED level to 50% as suggested in another post....

Re: Samsung UN58H5202 will not turn on. Help!



Hi Jetadm123,

I un soldered the surface mount mosfet on the back of the board labeled Q9102c. Then tested after watching a few videos. Looks like it is not working.

How would I find the part number for this Mosfet? and where can I buy it in the Toronto GTA area?

There is another thread I found on this topic (see link below). It's suggesting it may be a good idea to cut the LED level from 90% to 50% after replacing the Mosfet. I assume this is done in the settings menu of the...

Re: Samsung UN58H5202 will not turn on. Help!

Hi Andrew, budm, nomoresonys,

I unplugged the tv then disconnected the connector from the psu to the main board then plugged the tv back in. No backlights came on.

I re tested the standby voltage and the other pins next to it and I get 1.4 or 1.5 volts only. I used two different meters that were set on DC.

I watched a couple of the videos nomoresonys suggested. Tested the main filler capacitor and it read 170 volts.

Fuse is good.

Not sure at this point whether...

My Samsung UN58H5202 just one day did not turn on anymore. No red standby light. Nothing.
So I googled and found some troubleshooting ideas and they said to check the power supply board. I Checked the pins for Standby Voltage and other pins next to it where the main board plugs into. All were reading 2.5V (except gnd which was as expected 0). I went to buy a replacement board and the parts store said the new power supply board may only work for a few days because faulty LED backlight strips on my unit may cause the power board to burn out again and that this is a common problem with this...

Re: New Members - please post your introductions here

Hello Everyone! Novice here that likes to tinker around and try and fix things on his own. Looking to get some help on a Samsung TV issue. Will post a new thread soon with details and hope all can help.