[SOLVED]820-2849 no backlight

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bighead

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Hi,

I got this board with a no backlight issue.
No liquid damage. It shows the question mark. Just no backlight.

I tried different monitor with different LVDS cable.
I changed the LVDS connector on the board.
I changed the LED Driver. I bought one from L2. I thought it was bad so I ordered few from China.

This is what I have:
U9700
Pin 1 VIN - 8.4V
Pin 3 SWA - 8.4V
Pin 4 SWB - 8.4V
Pin 6 EN - 8.4V
Pin 16 PWM - 3.3V I can see the nice square wave on the scope
Pin 22 OVP - 1.4V
Pin 24 VOUT - 8.4V

PPVOUT_S0_LCDBKLT - 8.4V at the LVDS connector.
SMC_LID - 3.3V

This tells me the CHIP is bad, but that's impossible. I ordered it from different location.
I still have 3 to try, but I'm sure I'm missing something.

Thanks.
 
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