Atomrepair
Member
This board came in with only slight corrosion on U7701 and no backlight. I replaced U7701 and got backlight back, but not completely. On the left half of the screen only half of the leds are on, resulting in a row of dark spots. I tried different screens first, but they show the same pattern.
I assumed my soldering might be bad and replaced U7701 with a new one. No change.
P5V_S0 and PP3V3_S0 are stable. I checked LED_RETURN_1; it has connectivity to U7701.
LVDS connector looks pristine, inside as well as outside. Pins are all properly fixed in place.
Are these LED_RETURN voltages normal? Whats next? replace U7701 again with lower heat to make sure its not messed up?
LED_RETURN_6 | 0,58 | 5,4V |
LED_RETURN_5 | 0,58 | 5,4V |
LED_RETURN_4 | 0,58 | 0,5V |
LED_RETURN_3 | 0,58 | 0,5V |
LED_RETURN_2 | 0,58 | 0,5V |
LED_RETURN_1 | 0,58 | 0,5V |
I assumed my soldering might be bad and replaced U7701 with a new one. No change.
P5V_S0 and PP3V3_S0 are stable. I checked LED_RETURN_1; it has connectivity to U7701.
LVDS connector looks pristine, inside as well as outside. Pins are all properly fixed in place.
Are these LED_RETURN voltages normal? Whats next? replace U7701 again with lower heat to make sure its not messed up?