Victor Holley
Member
Liquid damaged 820-01958.
Initial presentation on usb-c ammeter:
First test: 20v and 0.03A Second test: 5v off and on alternating.
No boardview. Tried to map the water to 820-01521 boardview. Water was at Q7660 and Q7680. Water discolored crystal Y1900. Water was at some tiny resistor near the crystal that I could not determine identity using the 820-01521 boardview.
Ultrasonic cleaned.
Board seems to boot, with no display. 20v and 1-2A current. Charges the battery. Put board in a known good housing for 820-01521--same, no display.
Usb-c makes sound on connect/disconnect.
Tried to check external display as follows: Plug in usb-c HDMI dongle, connect monitor. No image on monitor. Confirmed known good 820-01521 produces external display.
Checked board again. Now found blown filter--may have missed on first look. Filter is probably L6701, L6702, L6703 by mapping to 820-01521. Likely trackpad.
Tested board again making sure trackpad not plugged in.
No display.
Diode mode at J8500 compared to logi.wiki for 820-01521. No short or open found.
And here I am!
What is the next step? Keep in mind I am not very experienced with Macbooks in general and may be missing some basics.
Initial presentation on usb-c ammeter:
First test: 20v and 0.03A Second test: 5v off and on alternating.
No boardview. Tried to map the water to 820-01521 boardview. Water was at Q7660 and Q7680. Water discolored crystal Y1900. Water was at some tiny resistor near the crystal that I could not determine identity using the 820-01521 boardview.
Ultrasonic cleaned.
Board seems to boot, with no display. 20v and 1-2A current. Charges the battery. Put board in a known good housing for 820-01521--same, no display.
Usb-c makes sound on connect/disconnect.
Tried to check external display as follows: Plug in usb-c HDMI dongle, connect monitor. No image on monitor. Confirmed known good 820-01521 produces external display.
Checked board again. Now found blown filter--may have missed on first look. Filter is probably L6701, L6702, L6703 by mapping to 820-01521. Likely trackpad.
Tested board again making sure trackpad not plugged in.
No display.
Diode mode at J8500 compared to logi.wiki for 820-01521. No short or open found.
And here I am!
What is the next step? Keep in mind I am not very experienced with Macbooks in general and may be missing some basics.