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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iMac, Macbook Pro, Macbook Air

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Old 02-02-2021, 13:14   #1 (permalink)
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Join Date: Nov 2015
Location: United Kingdom
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MacBook Pro A1286 - GPU Issue - Fan Spin 2 Seconds


820-2915 MacBook - No screen / no boot / no chime just fans spins for about 2/3 seconds
I have already checked the following core voltages:
ppbus_g3h=12.5v
Dcin = 16v
pp3v42_g3h =3.4v
ppvrtc_g3h= 3.3v
PP5V_S5=5v
PP5V_SUS=5v
PP5V_S3=0v
When I short power on pads , fans spin then shuts down and pp5v_s3=5v for about 2 seconds then shutdown to 0v.
I removed L2406 so I could program the g-mux but the same thing was happening - on , fan spin , off
ppvcore_gpu diode = 0v
ppvcore_gpu = 4.5 ohms
Any tips would be useful.
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Old 02-11-2021, 21:37   #2 (permalink)
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Join Date: Aug 2020
Location: dubai
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Replace the GPU chip
Also, check CPU supply
Change CPU ic and change CPU
Also check near GPU and CPU resistance
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