[SOLVED] 820-3330 usb not working.

[jgraffis]

I'm working on this 820-3330b that had a previous usb port not working. now the other port has stopped working. At first it would work intermittently and now not at all. the usb A port is working perfectly.

i am getting 5v on pin one of j4700, I couldn't find a short to ground but when measuring pins 2 and 3 i had .0L on them which is different from the other port. i do have continuity from the pins to 3-4 of d4700, also I'm getting 3.4v on pin 3-4 and 0.198v on pins 2-5 of d4700.

any ideas?

 

[larossmann]

usually bad L4600/L4700. Check diode mode measurement to ground, red probe on ground, on pins 6 & 7 of U4650 and pins 4/5/6/7 of U2760

 

[jgraffis]

thanks for the reply. upon checking for the diode measurements (all were good) i decided to check continuity on L4700 and noticed i had a connection to the top of the inductor but not the bottom. looked like there was a break in the trace that went from bottom of the inductor to the top. kinda strange. repealed and replaced all is working great again.

Thanks again louis. SOLVED