820-2936-B does not turn backlight

willie

New member
hello have a 820-2936-B does not turn backlight, measurements have taken are:
F9700 = 12v
PP3V3_S0 = 3.26v
PPBUS_SW_BKL = 11.94v
PP5V_S0 = 4.98v
PPBUS_SW_LCDBKLT_PWR = 0.04v wrong. After 30 seconds of setting up to 2.25V unstable
Q9706 PIN 3 8.05v.
 

dukefawks

Administrator
When there is 8V on pin 3 and 12V on pin 4 there should be 12V on pin 1. Looks like a bad Q9706 to start with, but check that LCD_BKLT_EN is high.
 

willie

New member
When there is 8V on pin 3 and 12V on pin 4 there should be 12V on pin 1. Looks like a bad Q9706 to start with, but check that LCD_BKLT_EN is high.

there is a problem here. In Q9707 pin 2 2.29v pin 6 0.95V pin 4 0v (pin 5 0v LCD_BKLT_EN) pin 3 8.52v.
 

willie

New member
No Title

if you have the screen image. what it is the backlight turns on the screen.
 

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