my name is Alex, I’m new into repairs and I have a question about one broken Switch I got. The switch doesn’t charge and doesn’t turn on. There is no batterie symbol on the screen, so I took it apart. The voltage switches from 0,67 and 0,50 all the time when I plug in the charger with the tester. USB-C Port and Batterie seem fine.
Next I checked the motherboard and found some shorted capacitors. I would like to attach pictures, but it doesn’t work somehow. How can I send media here?
My multimeter doesn’t react on the coil at the front. Is that normal? Steves Multimeter always reacts when he tests the coil, but mine doesn’t.
Can someone help me? I didnt replace anything on the motherboard yet.
afaict you listed the 2R2 coil nearby the BQ IC as being OL relative to ground, which would mean you don’t have a short on your SYS rail… but at the same time you’ve labeled the cap nearby the EN IC as being short… which as far as I remember is SYS input as being short… so it’s hard to follow what you mean
If you do indeed have a SYS rail short, then BQ IC would be first port of call, then the caps themselves around the Max IC’s or the IC’s themselvels following
The 2R2 coil is not bad. I cleaned the contacts around the coil and I didn’t get OL anymore. So it might be the SYS input. First I try replacing the BQ IC, then I try replacing the MAX IC’s. Thanks for your quick answer!
I think perhaps I’ve not been clear, when checking for a short to ground we are typically measuring relative to ground (it’s very rare for a coil to fail open) so if you place one probe on ground and another at any side of the 2R2 coil near the Bq IC and it doesn’t register as a short then it implies you don’t have a short on your SYS rail
Yeah your SYS rail is shorted, if your meters resistance range is high enough resolution you can often probe around elsewhere where SYS shows up, the lowest resistance reading relative to ground will point to the most likely candidate