Samsung UN60FH6200F Backlights but no picture

[doesntmind]

Plugging TV in results in the backlights turning on without having to press power button.
Pressing the power button causes the backlights to turn off for a second and then turn on again without anything displaying on screen.
Holding the power button causes the tv to turn off and on in 1 second intervals.

The readings from the connector that goes from power to main board while on are:

Pin# - Desc - Voltage
1 - B13V - 0V
2 - PMW_DIM - 0V
3 - B13V - 0V
4 - B13V - 0V
5 - VAMP - 0V
6 - BLU_ON - 0V
7 - VAMP - 0V
8 - GND - 0V
9 - GND - 0V
10 - GND - 0V
11 - B5V - 0V
12 - A5V - 5.3V
13 - B5V - 0V
14 - PS_ON - 0V


Disconnecting the main board from the power board results in the backlights turning on and off in 1 second intervals and voltage readings jumping up and down

Disconnecting the main board AND the backlights result in the below readings:

Pin# - Desc - Voltage
1 - B13V - 12.5V
2 - PMW_DIM - 3.4V
3 - B13V - 12.5V
4 - B13V - 12.5V
5 - VAMP - 12.5V
6 - BLU_ON - 3V
7 - VAMP - 12.5V
8 - GND - 0V
9 - GND - 0V
10 - GND - 0V
11 - B5V - 5.3V
12 - A5V - 5.3V
13 - B5V - 5.3V
14 - PS_ON - 3.3V

BACKLIGHT CONNECTOR:
Pin# - Desc - Voltage - Colored wire to LEDS
1 - D+ - 407V - BLUE
2 - D+ - 407V - NC
3 - NC - 0V - NC
4 - S- - 0V - BLACK
5 - NC - 0V - NC
6 - S+ - 0V - BLUE
7 - NC - 0V - NC
8 - D- - 4.6V - NC
9 - D- - 4.6V - BLACK

What do you guys think?

Pictures can be taken on request

Power Board
Model: L60G1_GHS
or BN44-00669A

Main Board
Model: BN94-06418UPC07
or BN97-06546E



Thank you and please let me know if you need more information

[Andrew F. Ali]

Re: Samsung UN60FH6200F Backlights but no picture

Hmmmmm....It would appear that you have LED backlights issue. The Main Bd and PSU seem to be OK. Do you know how to tear down the Panel to get to the LEDs?

[doesntmind]

Re: Samsung UN60FH6200F Backlights but no picture

Hmmmmm....It would appear that you have LED backlights issue. The Main Bd and PSU seem to be OK. Do you know how to tear down the Panel to get to the LEDs?

Good Call! After reading your reply i went ahead and powered the tv with only the LED cable disconnected and now I get sound. I will post again after digging further into the unit to look for the cause.

[budm]

Re: Samsung UN60FH6200F Backlights but no picture

Yep, LED/WIRING/CONNECTOR issue that'S why the Voltage went up to 407V!
http://www.shopjimmy.com/samsung-bn4...upply-unit.htm

[doesntmind]

Re: Samsung UN60FH6200F Backlights but no picture

After getting to the LEDs i found 28 of them that went out. Thanks for your help guys, i know what to do from here!

[Andrew F. Ali]

Re: Samsung UN60FH6200F Backlights but no picture

Change out all of the strips with new ones. The seemingly working old ones will fail in the very near future and you will have to do a repeat teardown and repair.