Mac A1181 820-2290 A NO POWER HELP!!!!

[NConstantinou]

laptop does not turn on.
i have 3.42 v, on bios i have 3.3v on pin 3 and 8 but on pin5,6 i get NO signal.
S5 power rail is ok
i do not have S3 and S0.
i have 3.3v and 5v on coils.
L7230,L7200, L7100,L7101 are shown short.


does bios work the same way as regular computers with mac!
does bios need to be program!

Thanks

[Techtiger]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

do you get the Green light on the chager L7230,L7200, L7100,L7101 must be CPU GPU coils what is the Resestence to GND

[piernov]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

820-2290 is DC-in board number. What's the logic board number? 820-1889, 820-2213, 820-2279, 820-2496…

Note that you need to trigger power button to get out of S5 state on those.
Check if you get green light on Magsafe first.
Go through the list of power rails measuring voltage. (when trigger power button)
No need to worry about BIOS if it's not even getting into S0 state…

[NConstantinou]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

do you get the Green light on the chager L7230,L7200, L7100,L7101 must be CPU GPU coils what is the Resestence to GND

Thanks for the reply,
L7320 is 16.3 Ω
L7200 33.5Ω
L7100 7.9Ω
L7101 7.9Ω

i have removed F6900 and i am using power supply

[NConstantinou]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

820-2290 is DC-in board number. What's the logic board number? 820-1889, 820-2213, 820-2279, 820-2496…

Note that you need to trigger power button to get out of S5 state on those.
Check if you get green light on Magsafe first.
Go through the list of power rails measuring voltage. (when trigger power button)
No need to worry about BIOS if it's not even getting into S0 state…

The only number i have on board is 820-2279-A 2007,i assumed this is the logic board number. does this help!
on power button i have 3.43V.
when i short power button fan is not working.
as i mentioned i am missing S3 and S0 power rails.
i followed as an example PP5V_S3 and i end up on TPS2060.
this Ic has correct inputs but pin 6,7 which are output pins instead of getting 5v i get 0.4v.
i will try to do pwer rails when triger power button and i will let you know

[NConstantinou]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

820-2290 is DC-in board number. What's the logic board number? 820-1889, 820-2213, 820-2279, 820-2496…

Note that you need to trigger power button to get out of S5 state on those.
Check if you get green light on Magsafe first.
Go through the list of power rails measuring voltage. (when trigger power button)
No need to worry about BIOS if it's not even getting into S0 state…

i have BAD news. i tried to place on/off switch on power button and the pad that has 3.4v came out.
can you help me from where i can get 3.4v!

thye board is 820-2279A 2007 and i am using power supply at f6900 points

[piernov]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

I'm confused. Plug in original Magsafe 60W or 85W and check if you get green light.
If you do, short SMC_ONOFF_L to ground (R5010 for example, can solder a small wire that you touch to a ground point) and see if the fan spins or at least moves slightly, and then measure voltage all the power rails following the list of power rails when shorting (and releasing) SMC_ONOFF_L to ground.

[NConstantinou]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

first point i pluged adapter but no green light or orange.
i will test rails as you suggested and i will come back. I look for R5010 but i can not find.

thanks

[piernov]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

Ok if there is no green light you have to measure exact voltage on PP3V42_G3H and PPBUS_G3H first.

[NConstantinou]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

PPBUS_G3H and PPBUS_G3H i have 5v

[RepulsiveStyler]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

If you don't have green light or orange light on your charger then you need to check schematics for one wire circuit which is responsible for it.

As mentioned by @piernov please report with voltage readings of PPBUS_G3H and PP3V42_G3H. The readings you should expect are the following:

PPBUS_G3H: 13V
PP3V42_G3H: 3.42V

If you PP3V42_G3H is present but PPBUS_G3H is not present then diode mode PPBUS_G3H to check if you have a partial short.

If the diode mode readings are very low then consider to inject voltage on PPBUS_G3H but keep in mind that your CPUV Core could be shorted so be careful and inject not more than 0.8V. Check if any MOSFETS are getting warm by pouring some alcohol on them. Once you are certain that none of the MOSFETS are getting warm then increase your voltage gradually.

[NConstantinou]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

Hi,
using power supply because mag adapter is defective and i am waiting for replacement.
i have checked PP3V42_G3H and i get 3.42v present and on PPBUS_G3H
since i have power supply connected i got 12.6v. my power supply is at 16v.
i had ground SMC_onoff_L without memory and fan stared spinning.
i shutdown power supply and installed memory and stopped spinning.
i removed memory again but didn't spin.

My G3H rails are working also s5 rails.
after that i went to S3 rails and test some points with SMC_onoff_l to ground but i didn't get any trigger on voltages.
should i continuous on s0 rails or is not worth it.

Thanks

[piernov]

Re: Mac A1181 820-2290 A NO POWER HELP!!!!

Use known good original Apple Magsafe 60W or 85W.