• Macbook A1989 Scheda madre 820-00850 20v non accende.

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Macbook A1989 Scheda madre 820-00850 20v non accende.

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#1 Macbook A1989 Scheda madre 820-00850 20v non accende.

by leonemax81 • 4 June 2025, 10:33
Ciao ragazzi ho questo macbook che non accende, tensioni in ingresso USBC 20v ma non accende, ho provato anche ripristino DFU ma non lo porta al termine, No corti no danni liguidi.

TENSIONI PRINCIPALI PRESENTI:
PPBUS_G3H 12.62 v.
PP3V3_G3H 3.3 v.
PP3V3_G3H_RTC 3.3v
PP5V_G3S 5 v.
PP2V7_NAND_SSD0 2.5 v.
PP1V8_SLPS2R 1.8 v

NON PRESENTI:
PP3V3_S5 Mancante

Re: Macbook A1989 Scheda madre 820-00850 20v non accende.

by Google Adsense [BOT] • 4 June 2025, 10:33

#2 Re: Macbook A1989 Scheda madre 820-00850 20v non accende.

by Vogelek23 • 4 June 2025, 15:25
leonemax81 wrote:PP3V3_S5 Mancante
What is the resistance to ground on that rail?

#3 Re: Macbook A1989 Scheda madre 820-00850 20v non accende.

by leonemax81 • 4 June 2025, 16:14
it is not shorted, the resistance is very high.

#4 Re: Macbook A1989 Scheda madre 820-00850 20v non accende.

by leonemax81 • 5 June 2025, 19:42
Sostituito chip U7800 senza successo.

Re: Macbook A1989 Scheda madre 820-00850 20v non accende.

by Google Adsense [BOT] • 5 June 2025, 19:42
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