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Old 08-06-2020, 08:47 AM   #1
Terence Ng
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Default Macbook Pro 15" 820-2850-A No Power

Symptom: Plug in DC magsafe showing green light and change to orange colour for battery charging. In this case, unit unable to power on when power button has been press. No fan spinning, no start up sound.

Step debug as below:-
1. Unit still unable to power on via power pad.
2. Failure remain the same after SMC reset.
3. Power Rails measure as below with only adaptor plug in (no Battery):-
> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v
> PPDCIN_G3H -- 16.5v
> PP3V42_G3H -- 3.42v
> PP3V3_S5 -- 3.32v
4. Others power rails no voltage.
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Old 08-06-2020, 03:30 PM   #2
piernov
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Default Re: Macbook Pro 15" 820-2850-A No Power

History of the machine? Known good 85W Magsafe?

Quote:
Originally Posted by Terence Ng View Post
> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v
Are you sure about this?
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Old 08-06-2020, 05:29 PM   #3
Terence Ng
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Default Re: Macbook Pro 15" 820-2850-A No Power

Is Known good 85W Magsafe, battery is charging when plug in.
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Old 08-07-2020, 05:19 AM   #4
Terence Ng
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Default Re: Macbook Pro 15" 820-2850-A No Power

Voltage measure with only battery condition:-
> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v
> PPDCIN_G3H -- 0v
> PP3V42_G3H -- 3.42v
> PP3V3_S5 -- 3.32v
> Others power rails no voltage.
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Old 08-15-2020, 10:53 PM   #5
cyclones
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Default Re: Macbook Pro 15" 820-2850-A No Power

Do all fuses pass a continuity check?
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Old 08-16-2020, 03:07 AM   #6
dellxps15
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Default Re: Macbook Pro 15" 820-2850-A No Power

pp1v05_s5_mcp volt ?
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Old 08-16-2020, 03:51 AM   #7
piernov
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Default Re: Macbook Pro 15" 820-2850-A No Power

PP1V05_S5_MCP doesn't exist on 820-2850. It's a 2010 model, there's no MCP.
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Old 08-21-2020, 01:57 AM   #8
Terence Ng
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Default Re: Macbook Pro 15" 820-2850-A No Power

Quote:
Originally Posted by cyclones View Post
Do all fuses pass a continuity check?
---Yes, fuse in good conditions
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Old 08-21-2020, 02:09 AM   #9
Terence Ng
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Default Re: Macbook Pro 15" 820-2850-A No Power

Latest measurement, Power Rails measure as below with only adaptor plug in (no Battery):-
> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v
> PPDCIN_G3H -- 16.5v
> PP3V42_G3H -- 3.42v
> PP3V3_S5 -- 3.32v
> PP3V_S3 -- 3.32v
> PP3V_S0 -- 3.30v
> PP5V_S5 -- 5v
> PP5V_S3 -- 5V
> PP5V_S0 -- 5V
> PP1V05_S0 -- 0V
-- CPUVTTS0_EN -- 3.3v
> ALL_SYS_PWRGD -- 0v
Observation:
1. All_SYS_PWRGD should be 3.3v for system to boot up but in this case is 0V
2. Suspect U7600 (ISL95870) faulty, try change but failure remain the same.
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Old 09-18-2020, 02:51 AM   #10
vinifera
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Default Re: Macbook Pro 15" 820-2850-A No Power

Macbook Pro i5 820-2850-A (2.4G)
Hi, i bought a defect motherboard and i'm not sure that the following components must be on the motherboard ? C5369 R5371 C5318 U5313 U5323 U5101 C5101 U3301 C3302 U3300 R3940 ? Can somebody help me ?
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Old 10-27-2020, 08:47 PM   #11
Terence Ng
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Default Re: Macbook Pro 15" 820-2850-A No Power

C5369 - No Mounted
R5371 - No Mounted
C5318 - No Mounted
U5313 - No Mounted
U5323 - No Mounted
U5101 - No Mounted
C5101 - No Mounted
U3301 - No Mounted
C3302 - No Mounted
U3300 - No Mounted
R3940 - No Mounted
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Old 10-28-2020, 12:31 AM   #12
vinifera
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Default Re: Macbook Pro 15" 820-2850-A No Power

thx Terence
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