M1 MacBook water damaged no display

[Win Me]

Hi, I get a M1 Macbook pro 820-02020 for repair today, and it is the first time I had a M1 to repair. So maybe if anyone already had this issue, I do not entirely have my 3v3_SW_LCD Voltage, it is at around 1V. I have EDP_PANEL_PWR_EN, it is 1V8.
And I am stuck here but before doing anything prefer to maybe have a M1 expert suggestion!

[mon2]

Re: M1 MacBook water damaged no display

Remove all power. Meter in resistance mode (lowest scale).

Check the resistance to ground of PP3V3_SW_LCD.

Remove the display, check the resistance to ground again of PP3V3_SW_LCD.

Post both measurements.

[Win Me]

Re: M1 MacBook water damaged no display

Remove all power. Meter in resistance mode (lowest scale).

Check the resistance to ground of PP3V3_SW_LCD.

Remove the display, check the resistance to ground again of PP3V3_SW_LCD.

Post both measurements.

both are around 7Mohms with screen connect or not

[mon2]

Re: M1 MacBook water damaged no display

So no short from the LCD power rail.

If you remove the LCD and then power up, what is the voltage of PP3V3_SW_LCD ? Perhaps the detection logic will turn this power rail OFF but worth a quick check.

Also confirm the voltage readings of:

ISNS_PPPANEL_SW_LCD_P
ISNS_PPPANEL_SW_LCD_N

which are involved with the current sense loop for this rail.

These lines link to UD920. Be sure that UD920 looks to be ok and is being powered as shown in the schematic.

What is the voltage of EDP_PANEL_DISCHARGE ?

When the PP3V3_SW_LCD rail is this low, is the UP701 device warm / hot to the touch ? Any liquid damage near this part ?

[Win Me]

Re: M1 MacBook water damaged no display

So no short from the LCD power rail.

If you remove the LCD and then power up, what is the voltage of PP3V3_SW_LCD ? Perhaps the detection logic will turn this power rail OFF but worth a quick check.

Also confirm the voltage readings of:

ISNS_PPPANEL_SW_LCD_P
ISNS_PPPANEL_SW_LCD_N

which are involved with the current sense loop for this rail.

These lines link to UD920. Be sure that UD920 looks to be ok and is being powered as shown in the schematic.

What is the voltage of EDP_PANEL_DISCHARGE ?

When the PP3V3_SW_LCD rail is this low, is the UP701 device warm / hot to the touch ? Any liquid damage near this part ?

So 1st, with screen cable removed 1V3 instead of 1V2 on PP3v3_SW_LCD

2nd 0V on both lines with screen cable pluged in (but it is a no stuff resistance)

3rd UD920 is also no stuff

4th EDP_panel_discharge with screen pluged in 0V

And not warm but there were liquid in this area. In fact the Computer had a workin screen and backlight but was not charging. I fixed the battery issue and just reflowed the UP701 area cause it was bad looking. I removed CP600 cause it was really bad looking, replaced it. I tested no backlight but image. I removed the cap that I took for a replacment retest and nothing, no backlight no picture (exept on external screen)

[Russelwijaya]

Re: M1 MacBook water damaged no display

hi win me, do you solved your problem on your macbook? cause i've got one with similliar with your problems..

[tallerpulsar]

Re: M1 MacBook water damaged no display

Hello,
Could you please tell me the equivalent of UP701 SLG5AP1564V
Where can I buy it.

Thank you so much.