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[SOLVED]820-3115-B No WLan hardware installed.

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gcain

gcain

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Laptop had a cup of coffee dumped on it by a feline villain.

Managed to get it back up and running, but it is reporting no WiFi hardware. Have tested with a known good card & cable.

PP3V3_WLAN:probe 1508 = 3.317

L3501::All Pins = 1.5mV

C3522 == 3.317

L3504::pin1 & 2 == 3.317

C3521 == 3.317

C3520 == 3.3137

Q3550::pin 1 == 3.315
Q3550::pin 2 == 3.315
Q3550::pin 3 == 1.8mV
Q3550::pin 4 == 3.315

C3550 == 3.315
C3551 == 3.315
R3550 == 1.8mV & 32kOhms
R3551::pin 1 == 3.315 & Pin 2 = 1.8mV & 10k Ohms.
Q7921::pin 1 == 3.315

The coffee wasn't around this area though, it was more around the bios area. Maybe that gives a clue.

Thanks in advance for the suggestions! :)
 
gcain

gcain

New member
U3540::pin4 == 3.3v
U3540::pin7 == 2.4mV

Everything looks nice and tidy in the general area. The connector looks good as well. I just tested with another cable again.
 
A

aprendiz

Moderator
U3540 has a pull-up resistor on pin 7 to PP3V3_WLAN_F (R3553).... Check if it is present, also doble check connector or maybe U3540 is shorted and pulling down the voltage......
 
D

dukefawks

Administrator
It should be low with airport connected and high with disconnected.

Check on diode mode:
L3501 pin 1,4
C3530/31 both sides
R3510/11 both sides
 
gcain

gcain

New member
L3501::1 = 0.324
L3501::2 = 0.319

C3530 & C3531 are missing off the board.
Checked on a donor 3115-B and it has those two capacitors. Going to do a transplant and report back.

I must have knocked them off the board because they were measured above....
 
gcain

gcain

New member
So I replaced C3530 and C3531 and the wifi works, I must have knocked them off at some stage.

Thanks Dukefawks.


Close and mark solved please.
I can't work out how to close a thread.
 
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