3437 no wifi

[wirelessplanet]

board has no liquid damage. i have changed out wifi card with known good and the board does not detect the wifi.

pp3v3 - 3.3v
pp3v3_s4 - 3.3v
AP_reset_conn_l - 3.3v

 

[2informaticos]

Any history fault available?

Post all U3540 voltages.
Check traces and contacts fpr J3501.

 

[wirelessplanet]

u3540:
1- 3.3v
2-.9
3-3.3
4-3.3
5-0
6-3.4
7-0
8-0

all traces good for j3501. customer said yesterday wifi stopped working

 

[2informaticos]

Check C3530/31 and be sure to get 100MHz clock at J3501.
Clean J3501 contacts and check diode mode to ground at data lines.

Bluetooth works?

 

[wirelessplanet]

no bluetooth
i don't have oscilloscope

 

[2informaticos]

Do PRAM reset and try known good USB macOS.
You can also try to flash BIOS, just in case.

If you access recovery menu, wifi still not available?

 

[wirelessplanet]

C3530 was bad