Apple 820-2915-A A1286 no power up

[angel-boy]

Apple 820-2915-A A1286 no power up
- first problem was graphic chip, after reballing , works great 2 days, after 2 days same problem , i replace graphic chip with second hand , but mainboard not starting , it`s charging the battery but no power.

- i remove second hand chip , and put the original chip back , same problem

where i need to look first ?

[dellxps15]

Re: Apple 820-2915-A A1286 no power up

with "no power up" u mean no fan spin nothing ? or just didnt chime and show display, but fan spin ok ?

does it power on without vga coil ?

[angel-boy]

Re: Apple 820-2915-A A1286 no power up

no power up = no fan spin no image, no power led . only battery charge.

the graphic chip AMD 216 0809000 i remove it , i understand that should start without .

[angel-boy]

Re: Apple 820-2915-A A1286 no power up

any help please. thanks

[ivanxxx]

Re: Apple 820-2915-A A1286 no power up

Check the flat cable that connects charging port and motherboard, goes over the cooling fan, you might put it wrong way around, common mistake?

[angel-boy]

Re: Apple 820-2915-A A1286 no power up

the laptop is charging , i check each cable, connected all good

[ktmmotocross]

Re: Apple 820-2915-A A1286 no power up

do u have s5 powers ok?

[angel-boy]

Re: Apple 820-2915-A A1286 no power up

i will need first board view and schematic to check . as i say tell me where to check first

[dellxps15]

Re: Apple 820-2915-A A1286 no power up

if u remove vga coil does it power on ?

[angel-boy]

Re: Apple 820-2915-A A1286 no power up

still not starting.

[dellxps15]

Re: Apple 820-2915-A A1286 no power up

check PM_PWRBTN_L, smc_onoff_l , if present and goes to 0 when pressing power botton.

[yorshh]

Re: Apple 820-2915-A A1286 no power up

I have the same problem with 820-2915. green light on the charger and charging battery if i plug a not full battery but not starting
pp342, 3.42
pp5v_s0 5v
pp5v_s3 0v ( is it present when the machine is off???)
ppbus_g3h 12v

[piernov]

Re: Apple 820-2915-A A1286 no power up

Apple fixes 820-2915 for free for the GPU issue, see: https://www.apple.com/support/macbookpro-videoissues/
Also S3 rails are not present when the computer is off (S3 means sleep, so there are present either when the computer is sleeping or when it is on). On older Macbook motherboard (pre-Haswell? not sure about that) you need to short the power button pads (taking care of not shorting any other pins) to turn the machine on.

[yorshh]

Re: Apple 820-2915-A A1286 no power up

done that. Not sure if it is a GPU problem. the laptop doesnt go from s0 state to s5

[Pascal Komlassan]

Re: Apple 820-2915-A A1286 no power up

please somebody can give me the bios dump of this machine??? thank's
i have the same problem my motherboard no power up

[Technician09]

Re: Apple 820-2915-A A1286 no power up

Please disable GPU board code 820-2915....