Samsung UN65MU6500FXZA won't turn on

Rotorcraft230 · 09-02-2019, 06:21 PM

hello all I hope someone can help me troubleshoot my TV. It's a 4K curved only 2 years old. The power supply is a BN44-00808E.

Symptoms:
Nothing happens when power button is hit. I opened up the back and have poked around and there is no voltage on the stand by pin on the power supply, but there is lots of other voltages that seen right but not for sure. If I unplug the connector going to the Main board the back light comes on, but as soon as I plug it back in the back light goes off. Nothing on the board looks bad. I'm suspecting there is a problem with the stand by circuit.

any help would be much appreciated

Thanks Mark

Rotorcraft230 · 09-02-2019, 06:43 PM

Trying to post pictures

Rotorcraft230 · 09-02-2019, 06:52 PM

Here are some pics of the power supply. The bar that says stay pwr is zero if this helps

Thanks Mark

**nomoresonys** · 09-02-2019, 06:59 PM

Seems like a faulty mainboard, do test 3 below, try to do it just like instructed.

**CapLeaker** · 09-02-2019, 07:03 PM

Means your main board isn't returning PSon to the PSU. Main board problem. Does the PWR LED light up on the front, you hit the power button and nothing is happening? May be a bad EEPROM on the main board.

Symptoms EEPROM replacement MAY fix:
- On screen display is stuck on logo screen
- TV won’t power on with remote or buttons (LED indicator remains same color)
- TV won’t turn on after being off for 30+ minutes
- TV shuts off by itself during channel scan or when switching inputs
- TV turns on and is stuck in color test pattern mode forever
- TV turns on but there is no backlight (LED indicator shows TV is on but there is no image)

Rotorcraft230 · 09-02-2019, 07:09 PM

Hello nomoresonys and CapLeaker, thanks for the replys I will do test 3. And CapLeaker there is no power LED when I hit the power button that I can see. I am not that familiar with this TV I am trying to help a friend. Where is the light located. I will go and do the test for you nomoresonys.
Mark

**R_J** · 09-02-2019, 07:22 PM

I see that you have backlights etc. with the main dissconnected so the power supply must be ok.

**CapLeaker** · 09-02-2019, 07:26 PM

o.k. no power LED, then check the PSU first as per R J. If you know that power goes to the main board, then you need a main board replacement. The EEPROM will NOT fix your problem. The LED should be located at the bottom right underneath a bit recessed to the back. You should feel a "bump". Basically look under the TV bottom right.

Rotorcraft230 · 09-02-2019, 07:26 PM

Hi R_J j807 is 9.66VDC. the one above that is 0VDC

Rotorcraft230 · 09-02-2019, 07:37 PM

Pin #
1 FAIL COUNT 0
2 ANA-DIM 0
3 A13V 9.67
4 OD ON/OFF 0
5 A13V 9.67
6 BLU_PWM 0
7 A13V 9.67
8 POWER_ON/OFF .103
9 A13V 9.67
10 GND 0
11 GND 0
12 GND 0

All these measurements were the same with power button not activated and activated.

thanks Mark

**R_J** · 09-02-2019, 07:41 PM

Is that J807 9.66 volts with the mainboard connected or not? It should be around 7.5v in standby and then go up to 11.8v with Power_on/off (or with the main board disconnected)
I suspect the 9.66 is the standby voltage, so if you are not seeing the Power_on/off line voltage change when you push the power button, your fault IS on the man board and it could be a faulty eeprom, Shopjimmy does have them available so it can be the problem. (If you order one, get the correct one for your board)

Rotorcraft230 · 09-02-2019, 07:45 PM

R_J, j807 is 9.67 with everything connected. if I disconnect the main board connector it goes to 12.84 and the back light comes on.
Mark

**R_J** · 09-02-2019, 07:49 PM

Ok, then that power supply is working like it should.

Rotorcraft230 · 09-02-2019, 07:56 PM

I just want to confirm which board is bad before I buy one.
Mark

**nomoresonys** · 09-02-2019, 08:24 PM

This might be it, try to match the BNxxx numbers on the white sticker on your mainboard or just contact them with your board details, they can tell you if it's a match: https://www.ebay.com/itm/Samsung-65-...oAAOSwKs1dUfd6

Rotorcraft230 · 09-02-2019, 08:31 PM

Hey thanks nomoresonys. There are lots in EBay the one you found isn’t the same one my TV has but I appreciate you spending the time looking.
I just was wanting some guidance on diagnosing. Sounds like a main board problem. Here is the one from my TV

**nomoresonys** · 09-02-2019, 08:32 PM

BN94-12428A and BN94-11709A will both work.

Rotorcraft230 · 09-02-2019, 08:34 PM

Ah sweet. I will shop for either one
Thanks nomoresonys!!
Mark

**nomoresonys** · 09-02-2019, 08:39 PM

Quote:

Originally Posted by Rotorcraft230

Hey thanks nomoresonys. There are lots in EBay the one you found isn’t the same one my TV has but I appreciate you spending the time looking.
I just was wanting some guidance on diagnosing. Sounds like a main board problem. Here is the one from my TV

.

**nomoresonys** · 09-02-2019, 08:41 PM

Quote:

Originally Posted by Rotorcraft230

Ah sweet. I will shop for either one
Thanks nomoresonys!!
Mark

That IS the one you need, done this many many time, I would not steer you wrong.

09-02-2019, 06:21 PM	#1
Rotorcraft230 Member Join Date: Jan 2015 City & State: Brazoria county TX My Country: USA I'm a: Knowledge Seeker Posts: 23	Samsung UN65MU6500FXZA won't turn on hello all I hope someone can help me troubleshoot my TV. It's a 4K curved only 2 years old. The power supply is a BN44-00808E. Symptoms: Nothing happens when power button is hit. I opened up the back and have poked around and there is no voltage on the stand by pin on the power supply, but there is lots of other voltages that seen right but not for sure. If I unplug the connector going to the Main board the back light comes on, but as soon as I plug it back in the back light goes off. Nothing on the board looks bad. I'm suspecting there is a problem with the stand by circuit. any help would be much appreciated Thanks Mark __________________ Successfully fixed: Sanyo 42" LCD, Sony 52" Bravia XBR9, Last edited by Rotorcraft230; 09-02-2019 at 06:26 PM..

09-02-2019, 06:59 PM	#4
nomoresonys Badcaps Veteran Join Date: Jan 2013 City & State: midwest My Country: U.S. I'm a: Knowledge Seeker Posts: 8,186	Re: Samsung UN65MU6500FXZA won't turn on Seems like a faulty mainboard, do test 3 below, try to do it just like instructed. __________________ (Signature) One of the first and least expensive things you can do when you have an issue is take the powerboard out of the tv, flip it over and look the solder joints over with a magnifying glass if needed, add a little flux to make the solder flow well and add solder to any joints that look even a little suspect. You can practice on a scrap pcb board if needed, careful not to bridge any joints, and always let the board sit for quite a while or discharge the big caps with an appropriate resister before working on it (safety first) to try to keep from getting shocked, it doesn't take 1000 volts to KILL, a lot less can kill, so be careful, it's only a tv.

09-02-2019, 07:03 PM	#5
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 5,216	Re: Samsung UN65MU6500FXZA won't turn on Means your main board isn't returning PSon to the PSU. Main board problem. Does the PWR LED light up on the front, you hit the power button and nothing is happening? May be a bad EEPROM on the main board. Symptoms EEPROM replacement MAY fix: - On screen display is stuck on logo screen - TV won’t power on with remote or buttons (LED indicator remains same color) - TV won’t turn on after being off for 30+ minutes - TV shuts off by itself during channel scan or when switching inputs - TV turns on and is stuck in color test pattern mode forever - TV turns on but there is no backlight (LED indicator shows TV is on but there is no image)

09-02-2019, 07:09 PM	#6
Rotorcraft230 Member Join Date: Jan 2015 City & State: Brazoria county TX My Country: USA I'm a: Knowledge Seeker Posts: 23	Re: Samsung UN65MU6500FXZA won't turn on Hello nomoresonys and CapLeaker, thanks for the replys I will do test 3. And CapLeaker there is no power LED when I hit the power button that I can see. I am not that familiar with this TV I am trying to help a friend. Where is the light located. I will go and do the test for you nomoresonys. Mark

09-02-2019, 07:22 PM	#7
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 8,146	Re: Samsung UN65MU6500FXZA won't turn on I see that you have backlights etc. with the main dissconnected so the power supply must be ok. Last edited by R_J; 09-02-2019 at 07:36 PM..

09-02-2019, 07:26 PM	#8
CapLeaker Leaking Member Join Date: Dec 2014 City & State: Atlantic Canada My Country: Canada Line Voltage: Ground, 0Hz I'm a: Hobbyist Tech Posts: 5,216	Re: Samsung UN65MU6500FXZA won't turn on o.k. no power LED, then check the PSU first as per R J. If you know that power goes to the main board, then you need a main board replacement. The EEPROM will NOT fix your problem. The LED should be located at the bottom right underneath a bit recessed to the back. You should feel a "bump". Basically look under the TV bottom right. Last edited by CapLeaker; 09-02-2019 at 07:30 PM..

09-02-2019, 07:37 PM	#10
Rotorcraft230 Member Join Date: Jan 2015 City & State: Brazoria county TX My Country: USA I'm a: Knowledge Seeker Posts: 23	Re: Samsung UN65MU6500FXZA won't turn on Pin # 1 FAIL COUNT 0 2 ANA-DIM 0 3 A13V 9.67 4 OD ON/OFF 0 5 A13V 9.67 6 BLU_PWM 0 7 A13V 9.67 8 POWER_ON/OFF .103 9 A13V 9.67 10 GND 0 11 GND 0 12 GND 0 All these measurements were the same with power button not activated and activated. thanks Mark

09-02-2019, 07:41 PM	#11
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 8,146	Re: Samsung UN65MU6500FXZA won't turn on Is that J807 9.66 volts with the mainboard connected or not? It should be around 7.5v in standby and then go up to 11.8v with Power_on/off (or with the main board disconnected) I suspect the 9.66 is the standby voltage, so if you are not seeing the Power_on/off line voltage change when you push the power button, your fault IS on the man board and it could be a faulty eeprom, Shopjimmy does have them available so it can be the problem. (If you order one, get the correct one for your board) Last edited by R_J; 09-02-2019 at 07:48 PM..

09-02-2019, 07:45 PM	#12
Rotorcraft230 Member Join Date: Jan 2015 City & State: Brazoria county TX My Country: USA I'm a: Knowledge Seeker Posts: 23	Re: Samsung UN65MU6500FXZA won't turn on R_J, j807 is 9.67 with everything connected. if I disconnect the main board connector it goes to 12.84 and the back light comes on. Mark

09-02-2019, 07:49 PM	#13
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 8,146	Re: Samsung UN65MU6500FXZA won't turn on Ok, then that power supply is working like it should.

09-02-2019, 07:56 PM	#14
Rotorcraft230 Member Join Date: Jan 2015 City & State: Brazoria county TX My Country: USA I'm a: Knowledge Seeker Posts: 23	Re: Samsung UN65MU6500FXZA won't turn on I just want to confirm which board is bad before I buy one. Mark

09-02-2019, 08:24 PM	#15
nomoresonys Badcaps Veteran Join Date: Jan 2013 City & State: midwest My Country: U.S. I'm a: Knowledge Seeker Posts: 8,186	Re: Samsung UN65MU6500FXZA won't turn on This might be it, try to match the BNxxx numbers on the white sticker on your mainboard or just contact them with your board details, they can tell you if it's a match: https://www.ebay.com/itm/Samsung-65-...oAAOSwKs1dUfd6 Last edited by nomoresonys; 09-02-2019 at 08:26 PM..

09-02-2019, 08:32 PM	#17
nomoresonys Badcaps Veteran Join Date: Jan 2013 City & State: midwest My Country: U.S. I'm a: Knowledge Seeker Posts: 8,186	Re: Samsung UN65MU6500FXZA won't turn on BN94-12428A and BN94-11709A will both work.

09-02-2019, 08:34 PM	#18
Rotorcraft230 Member Join Date: Jan 2015 City & State: Brazoria county TX My Country: USA I'm a: Knowledge Seeker Posts: 23	Re: Samsung UN65MU6500FXZA won't turn on Ah sweet. I will shop for either one Thanks nomoresonys!! Mark

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