MrPhoneDoctor
New member
Hi Everyone new here, I am working on the above macbook model that is not charging. It turns on with a charged battery however does not take charge. I am thinking this has something to do with current sensing.
I put under thermal camera and had chips UF400 and UF260 heat up. I replaced these 2 chips and heating is no longer present. UF260 was reprogrammed with proper bios. I am stumped, have spent few days trying to figure this out so am now reaching out to all you masters out here.
Below are some readings before fuse removal.
Ameter - 20v in 5v load & 0-150ma fluctuating power.
F5200
Voltage - 4-5v fluctuating
diode - .518
UF400
FF200 - 4-5v fluctuating
LDO - 1.5v
LDO Core - 3.3v
UF500
FF202 - 4-5v fluctuating
LDO - 1.5v
LDO CORE 3.3v
PPBUSAON - 8-12v Fluctuating
PP3V8_AON -3.8v
Removed fuse to test upstream and am now getting constant 12v on pin 1 F5200
Diode Pin 1 F5200 .566
Diode pin 2 f5200 - .510
I put under thermal camera and had chips UF400 and UF260 heat up. I replaced these 2 chips and heating is no longer present. UF260 was reprogrammed with proper bios. I am stumped, have spent few days trying to figure this out so am now reaching out to all you masters out here.
Below are some readings before fuse removal.
Ameter - 20v in 5v load & 0-150ma fluctuating power.
F5200
Voltage - 4-5v fluctuating
diode - .518
UF400
FF200 - 4-5v fluctuating
LDO - 1.5v
LDO Core - 3.3v
UF500
FF202 - 4-5v fluctuating
LDO - 1.5v
LDO CORE 3.3v
PPBUSAON - 8-12v Fluctuating
PP3V8_AON -3.8v
Removed fuse to test upstream and am now getting constant 12v on pin 1 F5200
Diode Pin 1 F5200 .566
Diode pin 2 f5200 - .510
