Re: macbook a2141 board 820-1700 no turn on
cheers
dcs10
Member
Last Activity: 12-06-2021, 07:05 AM
Joined: 09-23-2021
Location: london
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Re: macbook a2141 board 820-1700 no turn on
Hi piernov ,
what line powers the T2 chip ?
@mons 2 the inductor has not come yet so can i still power it up to check the
these
1) PPDCIN_G3H ?
2) PPDCIN_XA_G3H_F ?
3) PPDCIN_XB_G3H_F ?
4) P3V3G3S_EN ?
5) PP3V3_G3H_T ?
6) PP5V_G3S (24mv?) check on enable for this rail @ P5VG3S_EN_R
7) P3V3G3H_EN
regards
den...Leave a comment:
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Re: macbook a2141 board 820-1700 no turn on
USBC_XA_CC1 .539 cb413
USBC_XA_CC2 .539 cb414
USBC_XA_CC1 .535 cb313
USBC_XA_CC2 .535 cb314
USBC_XA_CC1 .540 c3113
USBC_XA_CC2 .540 c3114
USBC_XA_CC1 .545 c3213
USBC_XA_CC2 .545 c3214
all done no shorts here !
regards
denLast edited by dcs10; 10-12-2021, 05:21 PM.Leave a comment:
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Re: macbook a2141 board 820-1700 no turn on
left side of macbook pro
top port
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d+725 ohms
d- 725 ohms
bottom port
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d+725 ohms
d- 725 ohms
right side of macbook pro
top port
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d+725 ohms
d- 725 ohms
bottom port
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d+725 ohms
d- 725 ohms
looks like their are no short on the ACE' controller ,mon2
...Leave a comment:
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Re: macbook a2141 board 820-1700 no turn on
it's late so going to bed , but will keep looking for USB D+ / D- pin on the pdf
and thank you for your patience mon2
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
yes ,i have 4 * Type C ports on the logic board
On this note, i take it that you have tested other ports on this logic board to power the box.yes
ok don t want to sound stupid but were is the USB D+ / D- pin on the schematic 0800-01700
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
can i still apply power to the logic board, so i can measure around the 2nd ace controller without the l3500 inciLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
cheers thanks again
what is the 2nd ace controller?
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
hi
am i following you ? which ic is the 2nd ace controller is it U3200?
what rails would you like me to measure
that inductor L3500 got damaged the leg got riPPed off
sad
regards
denLast edited by dcs10; 10-11-2021, 02:02 PM.Leave a comment:
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Re: macbook a2141 board 820-1700 no turn on
inductor measured out of circuit
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
pin # 1 pad to ground of L3500 32 kohms
pin # 2 pad to ground of L3500 is 36 kohms
will start tomorrow on Q3501
cheers again
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
Resistance to ground of inductor (coil) L7660, pin 1 00.04
Resistance to ground of inductor (coil) L7600, pin 1 00.04
L3500 is still shorted (0 ohms)
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
hi mon2,
l3500 is short circuit
can i Power the circuit without the inductor in ?
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
thank you very much , i will try and do what you have ask post asap
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
L3500, pin 2 000.5mvdc
L3500, pin 2 resistance 0 ohms
PPBUS_G3H .200mv
PP5V_G3S 24mv
UPC_X_5V_EN_R 0v
PP5V_S4_X_USBC .800 mv
PP3V3_S5 0v
ok did it
power adapter is a good unit, and Compatible to support the required current for this logic board
regards
denLeave a comment:
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Re: macbook a2141 board 820-1700 no turn on
hi ,no liquid damage as fair as i can see . board personal
f3000/f3001 5vdc
pp3v3_upc_xb_ldo 3.4vdc
pp1v5_upc_xb_ldo_core 1.5vdc
pp3v3_g3h_rtc_x 0.27mv
pin 1 c3500 ppbus_g3h 118mv
all voltages around u3200
regards
denLast edited by dcs10; 10-09-2021, 08:53 PM.Leave a comment:
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macbook a2141 board 820-1700 no turn on
hi , i am denis
ok so this is my first repair and i am also new to the terminology , now thats out the way..
2019 a2141 16 inch t2 board 820-01700
ok i have 5.2vdc .0ma on usb c ameter
on the board i get 5vdc on f3000 & f3001
any help would be appreciated
regards
denLast edited by dcs10; 10-09-2021, 01:19 PM.
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