Samsung UE40D8000YS Strange Issue

[trunks81]

Hello

Ive got this tv and its showing me some strange issue!
When connecting the tv to AC there is no standby led also no voltage present on powersupply, Fuses they check out good.
When i disconnect the cable to the mainboard the backlight goes on and there are voltages present on the powersupply.
Also the fuse on the mainboard check out oke.
When i follow the flowchart frist component to check out is IC203 but i cant find any datasheet on it.
Also when powerboard is connected and i check the voltages on those parts there are zero.
So something is drawing the powerboard down?

[diif]

Re: Samsung UE40D8000YS Strange Issue

Page 4.4, only after tests the power supply work are tests on the mainboard done.

[trunks81]

Re: Samsung UE40D8000YS Strange Issue

When connecting ac the relay does not click.
Of i remove CN201 the relay clicks and BL goes on

[diif]

Re: Samsung UE40D8000YS Strange Issue

5V on pin 4 of CN201 ?

[trunks81]

Re: Samsung UE40D8000YS Strange Issue

Tested the board without an 1K present, and the Mainboard not connected.

PIN 1 = B5V Present
PIN 4 = A5V Present
PIN 7 = B18VS Present
PIN 11 = B13V Present

Also IC203 measure 1,5ohm between to legs, So i think this one is defective,
Only probleem i need to have the datasheet so i can check what the function is and wat the pinout is