• Macbook A1708 Main 820-00840A no power on

It is currently 14 December 2024, 04:28

Macbook A1708 Main 820-00840A no power on

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  1. Topic title should contain: the device's manufacturer, full model and the brief description of problem.
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#1 Macbook A1708 Main 820-00840A no power on

by robgerr • 21 August 2024, 11:23
Good morning, this macbook does not power on. COnnecting the (non-original) power supply it negotiates 20V and absorbs 1.40A (battery connected and perhaps charging). Disconnecting the battery it stores at 5V and after about 5 seconds it rises to 20V and absorbs 20 mAmp. I did a quick check under the microscope but I didn't find any oxidation damage, it seems perfect. I checked the main rails and they seem ok.
PPBUS_G3H 13,070v
PP3V3_G3H 3,42v
PP5V_S5 5v
PP3V3_S5 3,31v
PP1V_S5G 1v
PP1V8_S5 1,80V

Re: Macbook A1708 Main 820-00840A no power on

by Google Adsense [BOT] • 21 August 2024, 11:23

#2 Re: Macbook A1708 Main 820-00840A no power on

by ado • 21 August 2024, 20:16
PP5V_S4 - Oporność i napjęcie.

#3 Re: Macbook A1708 Main 820-00840A no power on

by robgerr • 22 August 2024, 15:37
Hi ado, thank's for your reply
PP5V_S4 measured on C7676 voltage 0v resistance veri high 1,80 Mohm

#4 Re: Macbook A1708 Main 820-00840A no power on 

by ado • 23 August 2024, 04:06
Cześć @robgerr.
To Cpu a dokładniej część Pch wybudza płytę do stanu S4. (PM_SLP_S4_L)
Wiki podaje
„Check if PP5V_S4 is missing but not shorted
Corrosion on R1451, (PM_BATLOW_L).
Sprawdź podczas startu czy masz na obu jakąś aktywność (napjęcia).

#5 Re: Macbook A1708 Main 820-00840A no power on

by robgerr • 26 August 2024, 15:43
R1451 is ok, no oxdation, no voltage in both side. The customer was in a hurry because he needed a computer and decided to buy a new one. Thank you in any case for the technical support you provided me

Re: Macbook A1708 Main 820-00840A no power on

by Google Adsense [BOT] • 26 August 2024, 15:43
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