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820-00165 usb port doesnt detect mouse or small powered usb

Y

Yoel Ren

Member
hi, this macbook came in with some backlight damage, fixed that.
Found out j4600 usb port has some problem. It will detect hard drive fine, but if pluged with mouse or wireless mouse receiver, or any small powered usb,it doesnt work.
The other usb port is working fine.
There's 5v on each side of L4600.
usb_pwr_en is 3.3v

I have tried replacing U4650 and U4600, but still the same, any idea ?
 
2informaticos

2informaticos

Administrator
Staff member
Seems to have problems with USB 2.0 communication.
Did you check L4600?
U4650 can be removed and bypassed (1-7/2-6).
 
Y

Yoel Ren

Member
L4600 is good, theres 5v on both side.
bypassed u4650,pin 1 to 7, 2 to 6, but still same, not detect wireless mouse / wired mouse.
 
Y

Yoel Ren

Member
diode mode is 0.420 on all pin ( 1-4 )
on known good board without the u4650 bypass, diode mode is 0.650 on both side left and right side, is this acceptable ?
 
2informaticos

2informaticos

Administrator
Staff member
Values look correct.
You should compare with the readings on pins 6/7 for good board.

Check J4600 for damaged pins, or corrosion.
 
Y

Yoel Ren

Member
I see you in other post recommending people to try remove the diode,even though measurement is good, just in case.
so i tried removing d4600 and d4601, and sure enough they start to work lol. I thought diode only died by shorting itself, but it can interfere like this..
Replaced with donor's, and usb 2 is now working, Thank you very much sir!!
 
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