[SOLVED] No green light 820-4924

[jamiehorn1]

Hi,

I get no green light on 820-4924.
ISL area looks perfect for ref.

On D7005 i get 0.02v on pin 1 which should be 16v+
Likewise for pin 2 its 0v.

On Q7010 i do get voltage on pin 1 at 16v but I'm confused what the DCIN ISOL area is for and whether this is causing the issue?

Any ideas?

Thanks

 

[jamiehorn1]

Update: Ran a wire from pin 1 of Q7020 to pin 1 Q7010 and i get a green light and PP3V42 obviously now present.... still not powering on though. Will pick this up again in the morning

 

[dukefawks]

First start with powering a magsafe connector with an external PSU or use a fake Chinese charger. The original ones will shut down if anything is wrong and are no good for diagnosis. Voltage on R7011 is the first thing to measure then.

 

[jamiehorn1]

Okay will do that later on - also forgot to add that D7010 was actually missing altogether. Do you think this is causing the problem?

 

[jamiehorn1]

okay so without the wire on R7011 i get 16.3v on each side

 

[jamiehorn1]

replaced D7010 and i now have a light on the charger. Missing PP5V_S3 so will troubleshoot U7501

 

[jamiehorn1]

missing PM_SLP_S4_L any ideas of common areas for this to fail? I have 41k on the clock signal. Is this too high?

 

[larossmann]

Is it entirely missing or does it pulse for a second when charger is plugged in?

 

[dukefawks]

Are you using a 60W/85W charger, these will not power on from 45W!

 

[jamiehorn1]

Yes 85W from the PSU. Louis I will check if it pulses when I’m back at the office. Thanks!

 

[jamiehorn1]

Okay back on it - swapped out the cables for the PSU as they were getting old anyway. Powered on straight away..... thanks for the help as always!