Macbook Pro 15" 820-2850-A No Power

Terence Ng · 08-06-2020, 08:47 AM

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.

**piernov** · 08-06-2020, 03:30 PM

History of the machine? Known good 85W Magsafe?

Quote:

Originally Posted by Terence Ng

> PPBUS_G3H -- 12.57v
> PPBUS_CPU_IMVP_ISNS -- 11.58v

Are you sure about this?

Terence Ng · 08-06-2020, 05:29 PM

Is Known good 85W Magsafe, battery is charging when plug in.

Terence Ng · 08-07-2020, 05:19 AM

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.

cyclones · 08-15-2020, 10:53 PM

Do all fuses pass a continuity check?

**dellxps15** · 08-16-2020, 03:07 AM

pp1v05_s5_mcp volt ?

**piernov** · 08-16-2020, 03:51 AM

PP1V05_S5_MCP doesn't exist on 820-2850. It's a 2010 model, there's no MCP.

Terence Ng · 08-21-2020, 01:57 AM

Quote:

Originally Posted by cyclones

Do all fuses pass a continuity check?

---Yes, fuse in good conditions

Terence Ng · 08-21-2020, 02:09 AM

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.

vinifera · 09-18-2020, 02:51 AM

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 ?

Terence Ng · 10-27-2020, 08:47 PM

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

vinifera · 10-28-2020, 12:31 AM

thx Terence

08-06-2020, 08:47 AM	#1
Terence Ng New Member Join Date: Aug 2020 City & State: Bedok My Country: Singapore I'm a: Knowledge Seeker Posts: 15	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.

08-06-2020, 05:29 PM	#3
Terence Ng New Member Join Date: Aug 2020 City & State: Bedok My Country: Singapore I'm a: Knowledge Seeker Posts: 15	Re: Macbook Pro 15" 820-2850-A No Power Is Known good 85W Magsafe, battery is charging when plug in.

08-07-2020, 05:19 AM	#4
Terence Ng New Member Join Date: Aug 2020 City & State: Bedok My Country: Singapore I'm a: Knowledge Seeker Posts: 15	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.

08-15-2020, 10:53 PM	#5
cyclones Member Join Date: Feb 2010 City & State: Ames Iowa USA Line Voltage: 120VAC 60Hz Posts: 69	Re: Macbook Pro 15" 820-2850-A No Power Do all fuses pass a continuity check?

08-16-2020, 03:07 AM	#6
dellxps15 Badcaps Veteran Join Date: Feb 2014 City & State: Italy My Country: italy I'm a: Knowledge Seeker Posts: 1,321	Re: Macbook Pro 15" 820-2850-A No Power pp1v05_s5_mcp volt ?

08-16-2020, 03:51 AM	#7
piernov Super Moderator Join Date: Jan 2016 City & State: Valbonne, 06 My Country: France I'm a: Knowledge Seeker Posts: 3,687	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.

08-21-2020, 02:09 AM	#9
Terence Ng New Member Join Date: Aug 2020 City & State: Bedok My Country: Singapore I'm a: Knowledge Seeker Posts: 15	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.

09-18-2020, 02:51 AM	#10
vinifera Vinifera Join Date: Aug 2018 City & State: Dilbeek My Country: Belgium Line Voltage: 230VAC I'm a: Hobbyist Tech Posts: 24	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 ?

10-27-2020, 08:47 PM	#11
Terence Ng New Member Join Date: Aug 2020 City & State: Bedok My Country: Singapore I'm a: Knowledge Seeker Posts: 15	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

10-28-2020, 12:31 AM	#12
vinifera Vinifera Join Date: Aug 2018 City & State: Dilbeek My Country: Belgium Line Voltage: 230VAC I'm a: Hobbyist Tech Posts: 24	Re: Macbook Pro 15" 820-2850-A No Power thx Terence

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