Post voltage at D8410, both pins.
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820-01521 water damaged does not start
- Thread starter Thomas2020
- Start date
Thomas2020
Member
1 PPVIN_SW_LCDBKLT_SW 0,02v
2 PPVOUT_S0_LCDBKLT_F 0,06V
2 PPVOUT_S0_LCDBKLT_F 0,06V
Post now BKLT_EN_R and BKLT_SD.
Thomas2020
Member
BKLT_SD 11,2V
BKLT_EN_R 3,3V
BKLT_EN_R 3,3V
Check R8450-53.
Post voltage and diode mode to ground at SCL/SDA lines.
Should be good to test with known good LCD assembly; backlight adjust comes from it, through I2C bus.
Post voltage and diode mode to ground at SCL/SDA lines.
Should be good to test with known good LCD assembly; backlight adjust comes from it, through I2C bus.
Thomas2020
Member
R8450 0.1 Ω
SCL lines 0.536 5.1V
SDA lines 0.537 5.1V
I do not have a display with a backlight for replacement
SCL lines 0.536 5.1V
SDA lines 0.537 5.1V
I do not have a display with a backlight for replacement
Did you check all 4 resistors???
Thomas2020
Member
yes
R8447 9.95 kΩ
R8450 0.1 Ω
R8452 1.542 kΩ
R8453 1.543 kΩ
R8451 0.1 Ω
R8442 0.1 Ω
R8447 9.95 kΩ
R8450 0.1 Ω
R8452 1.542 kΩ
R8453 1.543 kΩ
R8451 0.1 Ω
R8442 0.1 Ω
Thomas2020
Member
will it be possible to inject the backlight voltage somewhere ?
Backlight is adjusted through PWM and I2C protocol.
Thomas2020
Member
So you mean we've stopped moving ?
do you have any more ideas ?
do you have any more ideas ?
You need to test with known good working LCD assembly.
Thomas2020
Member
You were right, my next step was to desolder the screen on the matrix tapes, it turned out that there are traces of flooding under the screens and corrosion after cleaning everything, the backlight of the screen has returned but there is a new problem, the battery is not charging :-(
Battery is not even recognized?
Thomas2020
Member
I'm not sure what you mean but when I see the login screen I also see a battery icon that shows 45% of the battery charge
Thomas2020
Member
after connecting the charger, the meter shows 19.5 V and 0.3A but I do not hear the sound of USB connection.
There is a sound when the macbook starts up.
There is a sound when the macbook starts up.
Do PRAM reset first.
If percentage appears, battery is recognized.
You should check if macOS says to replace it.
If percentage appears, battery is recognized.
You should check if macOS says to replace it.
Thomas2020
Member
PRAM reset did not help
You should check if macOS says to replace it.
I do not have a password to log into the system
Can I restart this laptop and log in the new user without knowing the password to the old one ?
two days ago I'm sure the charger gave 1.5A at 19.5V
Did I damage something?
You should check if macOS says to replace it.
I do not have a password to log into the system
Can I restart this laptop and log in the new user without knowing the password to the old one ?
two days ago I'm sure the charger gave 1.5A at 19.5V
Did I damage something?
Be sure battery is properly connected (data and power cable), then monitor PPBUS_G3H voltage.
It should slowly increase, if battery is charging.
Does it start from battery alone?
It should slowly increase, if battery is charging.
Does it start from battery alone?
Thomas2020
Member
replacing the battery solved the problem
the laptop will go to the daughter instead of the garbage can
the laptop will go to the daughter instead of the garbage can