Quick A1465 Repair case

[mon2]

Client came in with no power to A1465 that worked fine yesterday - no liquid spills. Green / orange light ok on the magsafe.

No fanspin.

Check fuse F7140 -> blown. PPBUS_G3H ok from ISL side.

This means there was a short circuit event to blow the fuse. Removed battery / no power -> F7140, pin #2 (downstream side) to ground = 0.3 ohms (!!!).

Have the proper PPBUS_G3H voltage on F7140, pin #1 (producer side).

This means a damaged cap downstream (consumer side).

Used our SHORTKILLER (could have used a lab power supply) @ 0V7 (0.7 volts) -> applied onto pin # 2 (F7140; with red probe); black probe to metal ground. This tool is able to inject spikes of 30A.

Must keep the voltage for injection lower than the lowest - just in case CPU is shorting here to this rail.

Consumed ~7A and smelled a burn smell but unable to locate the fault. Forgot that we now own a thermal camera so dug it out (Qianli).

Hovered around the board with the camera during these pulses with the SHORTKILLER tool. Saw capacitor C7540 glow like a Christmas Tree. Repeated and found this cap glow like Rudolf's nose, again.

Plucked this defective cap but saw that the top side was cracked and lifted.

No more short circuit. Replaced the fuse from a donor. Board repaired.

[koby058]

Re: Quick A1465 Repair case

well done

sounds easy when you do it

[mcplslg123]

Re: Quick A1465 Repair case

This is a common fault on A1465/1466 when F7140 is blown.

[Bonzas]

Re: Quick A1465 Repair case

Client came in with no power to A1465 that worked fine yesterday - no liquid spills. Green / orange light ok on the magsafe.

No fanspin.

Check fuse F7140 -> blown. PPBUS_G3H ok from ISL side.

This means there was a short circuit event to blow the fuse. Removed battery / no power -> F7140, pin #2 (downstream side) to ground = 0.3 ohms (!!!).

Have the proper PPBUS_G3H voltage on F7140, pin #1 (producer side).

This means a damaged cap downstream (consumer side).

Used our SHORTKILLER (could have used a lab power supply) @ 0V7 (0.7 volts) -> applied onto pin # 2 (F7140; with red probe); black probe to metal ground. This tool is able to inject spikes of 30A.

Must keep the voltage for injection lower than the lowest - just in case CPU is shorting here to this rail.

Consumed ~7A and smelled a burn smell but unable to locate the fault. Forgot that we now own a thermal camera so dug it out (Qianli).

Hovered around the board with the camera during these pulses with the SHORTKILLER tool. Saw capacitor C7540 glow like a Christmas Tree. Repeated and found this cap glow like Rudolf's nose, again.

Plucked this defective cap but saw that the top side was cracked and lifted.

No more short circuit. Replaced the fuse from a donor. Board repaired.

Hi mon, may i know what bench psu you use that have 30A and can set under 1v ?

[mon2]

Re: Quick A1465 Repair case

It is this tool but shop around. I think it is cheaper at Vipphonefix. We use 0v7 setting.

Model TS-30A.

BTW, our display is quite dim compared to the picture but visible enough to do the job.

US $54.46 25%OFF | TS-30A TS-20A Short Killer PCB Short Circuit Fault Detector Box Short-circuit Fault Diagnosis Instrument for iPhone Repair
https://a.aliexpress.com/_mOW4AJE

[Bonzas]

Re: Quick A1465 Repair case

It is this tool but shop around. I think it is cheaper at Vipphonefix. We use 0v7 setting.

Model TS-30A.

BTW, our display is quite dim compared to the picture but visible enough to do the job.

US $54.46 25%OFF | TS-30A TS-20A Short Killer PCB Short Circuit Fault Detector Box Short-circuit Fault Diagnosis Instrument for iPhone Repair
https://a.aliexpress.com/_mOW4AJE

Thanks, i only have 10A that sometimes won't kill short.