Hey everyone,
I just got my hands on a broken switch I found that it charges at 0 amps 5v even with a known good battery. The BQ24193 has one shorted capacitor to the left of it and gets too hot to touch after just a few seconds. I’d like to include a picture of what capacitors are shorted but I don’t know how. I’ve then found a few capacitors shorted to ground next to the +MAX 77621AEWI. I’ve ordered the BQ24193 because I assume it is broken. Any Idea to why the capacitors next to te +MAX Chip are also shorted?
Soo,
I replaced the bq24193 and all the shorts on the board disappeared but it still wonr power on. The dock blinks rapidly but somehow my Amp usb tester still shows 0A (beggining to think it only works <1 A). Any Ideas?
I am dealing with your same problem and from what I’ve gathered from past threads, 0A usually is caused by faulty fuse, coil or m92 so check those 2 as well
Hey everyone,
After replacing the M92 and I still had no signs of live I investigated further and removed the P13 USB. After removing this chip a LOT of shorts right behing the Tegra appeared. Sadly this switch is unfixable. Thanks for your guys help tho!
Those components behind the tegra have very low resistance to ground so try to confirm those measurements with and without the pi3 before calling it a brick
But that’s my point, what you call “short” could just be a functioning component with very little resistance to ground. Been there, done that. Try to check again the main 3 chips and try to follow the voltage and the amperage before surrendering (but don’t cause any shorts with your multimeter because you’ll risk ruining the motherboard for good). Check again if you bridgedany pin etc
Plug the battery into your motherboard, then the usb cable and follow the voltage (don’t bridge anything though). Is 5V coming out of m92’s east side via? If not rework the chip. Or maybe it’s a defective one
The big cap above the USB port has 5V as expected (im using a normal phone charger dont have the genuine one on hand) going further to the M92 theres a small black cap also on 5V but on the input line of the M92 theres only 0.43V.
Section K number 7 as far as I remember should be 5V all the way through the greenish capacitor east of M92T36 (well, south of m92 in this picture). What measurements do you get at the capacitor or at the check pins?`
http s://gbatemp. net/attachments/switchre_side1-jpg.163347/