ytesfay80
Member
This board was sent to me as no backlight after liquid damage. For some reason I didn't even check to make sure there was an image before replacing everything. I replaced that entire area around the lcd connector and the connector as well as the lp8550 and the LVDS cable.
I am getting 0v on backlight while U8300 has around 3.3v on pins 1-5. Here are some other measurements I got.
J8300:
Pin 3/4 - 0v
Pin 15 - 2.67v
Pin 16 - 3.28v
Pin 18/19 - 3.3v
I get 2.5v on BLK_PWM but 0v on BKL_EN
Diode Mode on Backlight output caps - 0.59v
For some reason when I turn the machine on I can see the LCD slightly changing colors as if the screen turned on and I can see a faint color change when I turn it off but I don't see any image on the screen.
I don't have another display to test with but I plugged in an 11" lcd only with another lvds cable and I was able to see an image on the screen either when putting a flashlight to it.
I am getting 0v on backlight while U8300 has around 3.3v on pins 1-5. Here are some other measurements I got.
J8300:
Pin 3/4 - 0v
Pin 15 - 2.67v
Pin 16 - 3.28v
Pin 18/19 - 3.3v
I get 2.5v on BLK_PWM but 0v on BKL_EN
Diode Mode on Backlight output caps - 0.59v
For some reason when I turn the machine on I can see the LCD slightly changing colors as if the screen turned on and I can see a faint color change when I turn it off but I don't see any image on the screen.
I don't have another display to test with but I plugged in an 11" lcd only with another lvds cable and I was able to see an image on the screen either when putting a flashlight to it.