Antwort auf „Why doesn't my charger work?”Seems to be a thing with these chargers. This is what I have failed on this one: R2 (470 ohm), R3 (220 ohm), R4 (150 ohm), RS1 (0.43 ohm) - all open circuit Q1 (NDF04N60ZG) - shorted IC3 (SG6848) - probably blown The above components are PWM control and the main chopper transistor on the primary side. Normally a blown chopper will take out the main fuse, but there isn’t even one in this design. Instead they rely on RS1 (fusible resistor I’m assuming) to go open when the chopper shorts. This is a really crappy design, since the main filter caps would be a at 400V DC in the fault condition. There’s no bleeder resistor incorporated either, so if you go working on this, make sure you discharge the cap. D3/D9 (SB5200) - one shorted, other ok. These are the main rectifiers on the secondary side. I’ve seen this go short in other supplies, but good designed ones will shut down the PWM to prevent damage. Not this one it seems. Q2 (9565BGH) - Shorted (in fact had a hole in it). Q4 only reads 0.6V on two pins, but I...
Antwort auf „no service and constant searching sometimes?”Did you buy the housing with flexes already installed? In the early days with another supplier I found the housings always had poor quality or faulty parts installed. I had this issue on a 5C housing I replaced once, and it was the lightning port flex on the new housing. So I simply transferred the original one over to the new housing. The cellular antenna is on the back of the speaker, but connects to the motherboard via the lightning port flex and cable. Wifi antenna is at the top of the phone, and nothing to do with cell reception.