bighead
New member
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.
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.