Samsung ln-s3251d power cycling

[johns1mj]

I just picked up this tv. The power light flashed 4 times and waits 13 seconds and does it again. You can hear it power down. The inverter has all the correct voltages. The main input wire has all the correct voltages. There is a second wire going to the main board from the power board. I do not know if the voltages are correct.

24v det 5.3 v
gnd 1.9 mv
pwm 5 v
adim 3.4 v
b/l on/off 1.4 mv

I think I am looking at an input board problem. Can anyone confirm?

[budm]

Re: Samsung ln-s3251d power cycling

You do not have BL ON/OFF signal to turn on the backlights circuits.
ON = >2 Vdc
OFF = <1 VDC.

[johns1mj]

Re: Samsung ln-s3251d power cycling

Is that supposed to come from the Input board or the power supply?

[dick_barton]

Re: Samsung ln-s3251d power cycling

From the main board (input board)

[johns1mj]

Re: Samsung ln-s3251d power cycling

I thought I posted but it is gone. If deleted please let me know why.

I can't find a board schematic for this board. bn97-00810a or bn41-00679b

[fredaelsadany]

Re: Samsung ln-s3251d power cycling

hi
inside service manual you will find schematic of the main board
this the link
http://elektrotanya.com/samsung_ln-s.../download.html
good luck

[johns1mj]

Re: Samsung ln-s3251d power cycling

thanks

[fredaelsadany]

Re: Samsung ln-s3251d power cycling

hi
these 2 pic for the power of samsung tv taken from the service manual .
I think will help you
thanks

[fredaelsadany]

Re: Samsung ln-s3251d power cycling

hi
link to service manual
http://elektrotanya.com/samsung_ln-s.../download.html
good luck

[johns1mj]

Re: Samsung ln-s3251d power cycling

i couldn't trace the issue. Thank you for every ones support. I replaced the board and the tv is now up and running.