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820-3437 no magsafe light

J

jadao

Member
I found this one a little tricky, no corrosion. I have no magsafe light at all.
PP3V42_G3H = 3,41V,
PPBUS_G3H, = 8,6V,
SMC_BC_ACOK=3.3V, present at I/O board J9500 connector
SYS_ONEWIRE=3,4V present at I/O board J9500 connector..
ISL6259 pins 17,18= 5ohms, 27,28=22ohms. DCIN 16V and ACIN (4.xV) present

It powers fine with charger only. it powers fine with battery only.
If I plug in magsafe while laptop is powered wtth battery I can see the charging logo but it actually doesn't charge, and the source is ac adapter.

When I check battery status everything is normal, battery is seen and percentage ans estimated time is correctty reported, however in the system report for the magsafe I see nothing but:
Connected: YES
Identifier: 0x0000
Revision: 0x0000
Family: 0x0000
Serial: 0x000000000
Charging: No

Using only original magsafe and known good tested i/o board i/o cable and battery.

Any idea??? Maybe a stupid thing I overlooked or an smc issue?
Thanks in advance
 
J

jadao

Member
It was really missing, now I have back smc_BC_ACOK 3,3V at pin 1 of J9500, but still no magsafe light.
I doubled checked the connector even in the internal pin#1 and I get 3.3V...
Still investigating..
 
Gmorb

Gmorb

Member
Odd that the board powers on and still no green light. Seeing how you have bcacok... i would suspect smc being bad seeing how it wont charge battery reflow it or replace.
 
J

jadao

Member
Thanks for the suggestion Gmorb. Yeah it was powering on both with only charger or only battery. But there was no syswire communication.
It's fixed, somebody had used brutal force on J9500, as sys_onewire pin was moving, same thing for SMC_BC_ACOK. No corrosion at all, clean board...
Didn't want to reflow smc because it's alive with proper voltage, and passes EFI...
Now in system report I can see the magsafe charger well identified.

The odd thing is that I just lost backlight, maybe this board is finishing the avalanche failure now that magsafe light is restored:)
It was faint backlight then screen shut off. strange behaviour backlight going to 19-24V and then 8,6V.
I will check that more in details.
 
J

jadao

Member
Thanks 2informaticos! that helped at least locate the issue, backlight was ok without the i/o cable.
SMC LID was low because of...keeping my test speaker upside down with its magnet just beneath the sleep sensor. What a total troll...
Now I don't have audio, I mean it's not disabled, i see the audio speaker logo in the menu but no sound emitted. I am sure something still related to J9500. It's something inttermitent, because when I was diagnosing the no magsafe light I heard from time to time the chime, probably another bad pin. I will inspect thoroughly the pins and let you know.
 
J

jadao

Member
Ok It is solved, done with that board. It turns out my 3 years old 2 pin speaker test died,
Thanks for everything.
 
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