Samsung UE40C6600 problem with power supply

**Xristakis795** · 01-26-2022, 11:42 AM

Hi to all
i have the above model of tv
It has power supply bn44-00355a
the problem is it burns the two mosfet TK8A50 page 5 of service manual
I change the two mosfets after measurements I made without being able to find any other problem and again burns the new 2 mosfet
can any of you help me figure out where these two components can burn?

**nomoresonys** · 01-26-2022, 01:10 PM

Can you post the service manual so we can see what you are seeing?

**R_J** · 01-26-2022, 01:20 PM

You likely have damaged gate drive components, check the DT1 to be sure the drive windings are not open, then check the resistors and diodes DM804 & DM805, you may need to lift one end to check them accurately
You should also check the diodes on the TM801S secondary as one might have shorted.

**Xristakis795** · 01-26-2022, 01:55 PM

thanks sir i will check it and i will tell you about
as about as service manual downloaded free from electrotanya

01-26-2022, 11:42 AM	#1
Xristakis795 Senior Member Join Date: Mar 2021 City & State: Athens My Country: Greece I'm a: Knowledge Seeker Posts: 100	Samsung UE40C6600 problem with power supply Hi to all i have the above model of tv It has power supply bn44-00355a the problem is it burns the two mosfet TK8A50 page 5 of service manual I change the two mosfets after measurements I made without being able to find any other problem and again burns the new 2 mosfet can any of you help me figure out where these two components can burn?

01-26-2022, 01:10 PM	#2
nomoresonys Badcaps Veteran Join Date: Jan 2013 City & State: midwest My Country: U.S. I'm a: Knowledge Seeker Posts: 7,698	Re: Samsung UE40C6600 problem with power supply Can you post the service manual so we can see what you are seeing?

01-26-2022, 01:20 PM	#3
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 7,990	Re: Samsung UE40C6600 problem with power supply You likely have damaged gate drive components, check the DT1 to be sure the drive windings are not open, then check the resistors and diodes DM804 & DM805, you may need to lift one end to check them accurately You should also check the diodes on the TM801S secondary as one might have shorted.

01-26-2022, 01:55 PM	#4
Xristakis795 Senior Member Join Date: Mar 2021 City & State: Athens My Country: Greece I'm a: Knowledge Seeker Posts: 100	Re: Samsung UE40C6600 problem with power supply thanks sir i will check it and i will tell you about as about as service manual downloaded free from electrotanya Last edited by Xristakis795; 01-26-2022 at 02:18 PM..

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