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#1 |
New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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![]() 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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#2 |
Super Moderator
Join Date: Jan 2016
City & State: Valbonne, 06
My Country: France
I'm a: Knowledge Seeker
Posts: 3,693
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![]() History of the machine? Known good 85W Magsafe?
Are you sure about this?
__________________
OpenBoardView — https://github.com/OpenBoardView/OpenBoardView |
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#3 |
New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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![]() Is Known good 85W Magsafe, battery is charging when plug in.
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#4 |
New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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![]() 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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#5 |
Member
Join Date: Feb 2010
City & State: Ames Iowa USA
Line Voltage: 120VAC 60Hz
Posts: 69
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![]() Do all fuses pass a continuity check?
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#6 |
Badcaps Veteran
Join Date: Feb 2014
City & State: Italy
My Country: italy
I'm a: Knowledge Seeker
Posts: 1,321
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![]() pp1v05_s5_mcp volt ?
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#7 |
Super Moderator
Join Date: Jan 2016
City & State: Valbonne, 06
My Country: France
I'm a: Knowledge Seeker
Posts: 3,693
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![]() PP1V05_S5_MCP doesn't exist on 820-2850. It's a 2010 model, there's no MCP.
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#8 |
New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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#9 |
New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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![]() 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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#10 |
Vinifera
Join Date: Aug 2018
City & State: Dilbeek
My Country: Belgium
Line Voltage: 230VAC
I'm a: Hobbyist Tech
Posts: 24
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![]() 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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#11 |
New Member
Join Date: Aug 2020
City & State: Bedok
My Country: Singapore
I'm a: Knowledge Seeker
Posts: 15
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![]() 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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#12 |
Vinifera
Join Date: Aug 2018
City & State: Dilbeek
My Country: Belgium
Line Voltage: 230VAC
I'm a: Hobbyist Tech
Posts: 24
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![]() thx Terence
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