Samsung Model PS59D8000

[wazzadj@hotmail.com]

Hi Guys ,
Hope you are all staying safe and well in these troubling times
I need some help please on the following fault condition
Samsung Plasma panel is showing a red standby light when i switch it on via the remote it clicks the red light starts flashing then goes to white led but no picture or sound is displayed ,
I have checked the voltages here are my results

BOARD NUMBER BN44-0044.7A

Mains power 230vac
VS = 0V
VE= 0V
VSC =0V
5Vstby =5v

So i have a issue with the supply board not turning on
so i have checked the pin header connections as follows

Bottom header 6 pin CN602
B5v=5vdc
B5v=5vdc
Gnd=0v
VScon= 0.8vmv
PSon= 206.2mv
VSon= 1.7mv

Con 601
B5v=5.63vdc
B15v=15.7vdc
B15v=15.7vdc
GND=0v
GND=0v
GND=0v
B15v=15.16v
GND=0v
A5v=5.379vdc
PSon=209.2mv

So i had access to swaping out a power supply board with a verified working one
the fault still remains , i believe it might be a fault in the Main board not switching on the power supply
Is their a way i can jump the connector to manually turn on the supply board to test if it will come on?
your help is much appreciated
thankyou
Wayne

[budm]

Re: Samsung Model PS59D8000

All the boards connected.
What do you get on PS-ON pin when TV is turned off?

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

All the boards connected.
What do you get on PS-ON pin when TV is turned off?

Thanks Bud ,for getting back to me
I have tried to manualy jump from the logic board via samsungs service manual and i cant even get the supply to turn on

ok with the tv turned off into standby with the red led constant
i get
PSON =3.30v con801

cheers
Wayne

[budm]

Re: Samsung Model PS59D8000

This BN44-0047A uses ACTIVE LOW (<1V = ON, >2V = OFF) for PSON, that is why the switched B5 and B15 are present when PSON is at 0.2V as you measure, so PSON is working fine, but the VSON is not working.

The VSON is active high, so to force on the Vs power supply section you can force it on by connecting 1K resistor between VSON pin and A5V (Always ON 5V) to force on the Vs power supply.
If you want to force on the Vson with all cables connected you must disconnect the VSON wire going back to the main board before trying to force on, if you jump the VSON to A5 directly (without resistor) and the main board is still connected you can damage the main board.

Is the other pin Vscon?

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

I all so noticed on the X Main board the Cable that joins the X&Y boards
@ pins 1 & 2 that go to pin 12 & 13 =VS on the Y Mainboard
NOTE Y MAINBOARD IS UNPLUGGED
i am seeing a short to gnd when resistance testing the plug on X main board
is this correct ?

Cheers
Wayne

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

Ok i will try & force the VSon and see if it will fire up and i will definetly put a 1k res in does it matter what wattage the 1k res is?
Yes mate the other pin is VScon

This BN44-0047A uses ACTIVE LOW (<1V = ON, >2V = OFF) for PSON, that is why the switched B5 and B15 are present when PSON is at 0.2V as you measure, so PSON is working fine, but the VSON is not working.

The VSON is active high, so to force on the Vs power supply section you can force it on by connecting 1K resistor between VSON pin and A5V (Always ON 5V) to force on the Vs power supply.
If you want to force on the Vson with all cables connected you must disconnect the VSON wire going back to the main board before trying to force on, if you jump the VSON to A5 directly (without resistor) and the main board is still connected you can damage the main board.

Is the other pin Vscon?

[budm]

Re: Samsung Model PS59D8000

I all so noticed on the X Main board the Cable that joins the X&Y boards
@ pins 1 & 2 that go to pin 12 & 13 =VS on the Y Mainboard
NOTE Y MAINBOARD IS UNPLUGGED
i am seeing a short to gnd when resistance testing the plug on X main board
is this correct ?

Cheers
Wayne

Are you talking about VSon pin?

What does the service say about VScon pin?

Does the service manual have the diagram of the power supply?
Have to be careful about forcing on the power supply if everything are connected except the control line since the power supply has to be turned on in sequence so it is not exposed to high inrush if all the power supply sections are forced on at the same time. I do not know the sequence turn on of this board.
Another thing is that you do not have short circuit (LOADS) On the VS, VA outputs.
It may be best to test the power supply board by itself without any thing connect to it except the incoming AC

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

oh i dont know if i will attempt that then dont want to blow it up
so i guess the million dollar question is the fault comming from the main board where does the VSon signal get its control from to tell the VS on to work ?

cheers
Wayne

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

The manual does not say anything about VS-CON
1. STBY 5V (CN801, #2, 5v)
2. PS_ON (CN801, #1, 3.3v-0v)
3. VS_ ON (CN802, #6, 0-3.3v)
4. Panel should illuminate briefly

[budm]

Re: Samsung Model PS59D8000

You may want to read this thread also:
https://www.badcaps.net/forum/showth...-00447A&page=2
I am not sure if the VSon is being locked out due to fault.
You can still test the power supply by itself without having connected to any loads (boards). It will be safer that way.

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

i am refering to con 4008 on X -main board pin 1& 2 are reading a Ground on my Meter
these 2 pins go to VS pin12 & Pin 13 on the Y main
Is this a Fault ?

I all so noticed on the X Main board the Cable that joins the X&Y boards
@ pins 1 & 2 that go to pin 12 & 13 =VS on the Y Mainboard
NOTE Y MAINBOARD IS UNPLUGGED
i am seeing a short to gnd when resistance testing the plug on X main board
is this correct ?

Cheers
Wayne

[budm]

Re: Samsung Model PS59D8000

i am refering to con 4008 on X -main board pin 1& 2 are reading a Ground on my Meter
these 2 pins go to VS pin12 & Pin 13 on the Y main
Is this a Fault ?

I have no idea since I do not have the schematic to find out what those pins are connected to what devices on the board..

[wazzadj@hotmail.com]

Re: Samsung Model PS59D8000

Thanks BudM i appreciate the help i have read the post i will check my HPV caps to see if they are getting 390v
otherwise i guess i have a bad replacement board
the fact i can even get the test patern to fire up
tell me their is a issue VS- ON
anyway i will keep digging

[Chrissygizmo]

Re: Samsung Model PS59D8000

Hi there, I'm looking for a power supply board (BN44-00446A ) for a Samsung PS51D6900D, do you still have the spare BN44-00447A board & if so would you be interested in selling it?