i have power everywhere except where it says volt...
should be 3.4 would i have to run a one wire to this cap or run one to the bios thanks
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i have power everywhere except where it says volt...
should be 3.4 would i have to run a one wire to this cap or run one to the bios thanks -
Re: Macbook pro A1278 green light but no power
Mother board code 820-........???????????????? -
Re: Macbook pro A1278 green light but no power
sorry its a 820-3115 bComment
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Re: Macbook pro A1278 green light but no power
SMC_RESET_L voltage ?????????
SMC_PM_G2 voltage ?????????????Last edited by dycc; 11-07-2017, 06:03 PM.Comment
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Re: Macbook pro A1278 green light but no power
3.4 and 0 and wont boot when shortedComment
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Re: Macbook pro A1278 green light but no power
SMC_PM_G2 voltageComment
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Re: Macbook pro A1278 green light but no power
sorry have no idea cant even find that on the scamadicsComment
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Re: Macbook pro A1278 green light but no power
i will figure it out and test it ,,, theres no power on any of the bios pins as wellComment
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Re: Macbook pro A1278 green light but no power
Smc_reset_lAttached FilesComment
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Re: Macbook pro A1278 green light but no power
Smc_pm_g2_enAttached FilesComment
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Re: Macbook pro A1278 green light but no power
3.47 on pin 2 of u7941 SMC_PM_G2Comment
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Re: Macbook pro A1278 green light but no power
Smc_pm_g2_en
test 0Comment
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Re: Macbook pro A1278 green light but no power
Smc_reset_l
test 3.16Comment
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Re: Macbook pro A1278 green light but no power
S5_pwrgdComment
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Re: Macbook pro A1278 green light but no power
FIRST YOU SAID Smc_pm_g2_en 3.47V AND NOW 0 V ?????????????
DO NOT TEST VOLTAGES AT THE PINS SIDE OF COMPONENTS WHEN THEY ARE TOO SMALL , to avoid shorting two pins at the same time. use instead other testpoints.Attached FilesLast edited by dycc; 11-08-2017, 12:53 AM.Comment
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Re: Macbook pro A1278 green light but no power
S5_pwrgd
test 0
sorry yes made a mistake and tested wrong place on the Smc_pm_g2_en proper test was 0Comment
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Re: Macbook pro A1278 green light but no power
ok now check theses lines to find if one is shorted to ground
PPBUS_G3H
PP3V3_S5
PP5V_S5
PP5V_SUS
PP3V3_SUS
PP3V3_S4
PP5V_S3
PP3V3_S3
PP1V5_S3
PP3V3_ENET
PP3V3_WLAN
PP5V_SW_ODD
PP5V_S0_HDD_FLT
PP3V3_S0_LCD_F
PP3V3_LCDVDD_SW_F
PP4V5_AUDIO_ANALOG
PP1V05_S0
PP1V5_S3RS0
PP1V8 S0
PP3V3_S0
PP5V S0
PPVCCSA_S0_CPUComment
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Re: Macbook pro A1278 green light but no power
PPBUS_G3H 12.56
PP3V3_S5 0
PP5V_S5 bounces between 0.04 and 0.02
PP5V_SUS 0
PP3V3_SUS 0
PP3V3_S4 0
PP5V_S3 0
PP3V3_S3 0
PP1V5_S3 0
PP3V3_ENET 0
PP3V3_WLAN 0
PP5V_SW_ODD 0
PP5V_S0_HDD_FLT 0
PP3V3_S0_LCD_F 0
PP3V3_LCDVDD_SW_F 0
PP4V5_AUDIO_ANALOG 0
PP1V05_S0 0
PP1V5_S3RS0 0
PP1V8 S0 0
PP3V3_S0 0
PP5V S0 0
PPVCCSA_S0_CPU 0Comment
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Re: Macbook pro A1278 green light but no power
[QUOTE=robertpritchard;782693]PPBUS_G3H 12.56
PP3V3_S5 0
PP5V_S5 bounces between 0.04 and 0.02
PP5V_SUS 0
PP3V3_SUS 0
PP3V3_S4 0
PP5V_S3 0
PP3V3_S3 0
PP1V5_S3 0
PP3V3_ENET 0
PP3V3_WLAN 0
PP5V_SW_ODD 0
PP5V_S0_HDD_FLT 0
PP3V3_S0_LCD_F 0
PP3V3_LCDVDD_SW_F 0
PP4V5_AUDIO_ANALOG 0
PP1V05_S0 0
PP1V5_S3RS0 0
PP1V8 S0 0
PP3V3_S0 0
PP5V S0 0
PPVCCSA_S0_CPU 0[/QUOTE
don't check voltages at this time , i know you will never have any voltages at s3 and s0 states since s5_pwrgd is low. put your miltimeter on diode mode , and give values (line to ground ). disconnect battery and adapter to do these testsLast edited by dycc; 11-09-2017, 01:29 AM.Comment
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Hello again,
got an MacBook Pro from 2015, model A1502 and motherboard version 820-3476-A.
Device died over night on charger.
Currently I did the follow things:
1. Checked visuell the board, test with another MagSafe-Charger and with another DC-IN-board too
2. Measured 16,5V on PP18V5_DCIN_FUSE but 0V on ADAPTER_SENSE and 0V on PP_3V42_G3H and 0V on PPBUS_G3H but 16,5V goes to U7090
3. Because of corrosion and bad resistor values I changed these components: U7090 / C7094 / C7095 / R7095 / R7096 / L7095 / C7099 -> But further... -
Hi, I have a MacBook pro A1278 (820-3115-B) that has green light on the charger and does not turn on, the fan does not spin.
The voltages in the SMC seem correct. I have made voltages measurements on the main coils and I put their measurements here:
L7220..........3.3V
L7260...........5.12V
L7330..........1.5V
L7030..........12.67V
L3895..........2.5V
L7760..........1.80V
L9701..........0V
In the following coils they give me continuity with ground, which seems strange to me:
L7550,L7510,L7520........ 0V
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I am looking at an A2337 and found this for the order of power rails and what they do. Can this be confirmed before I dive into hunting down power rails that do not exist or are not neccisary?
- PPBUS_G3H (12.6V-12.8V)
- This is the main power rail that supplies power to the entire system. Check this rail first, as it must be present for other power rails to work.
- PP3V42_G3H (3.42V)
- This power rail is derived from PPBUS_G3H and is used to power the SMC (System Management Controller) and other essential circuits. It should be present if PPBUS_G3H is working correctly.
- PPVRTC_G3H (3.3V)
- This
- PPBUS_G3H (12.6V-12.8V)
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I have a 13 inch MacBook Air 2017 that does not show any life, however, there is activity from the MagSafe light going from green to orange and staying. Normally, this battery works perfectly fine and it can actually charge the battery as if I were to leave it alone it would change to just green, however, this thing does not boot up at all, I was told the computer was at 30% and then it randomly shut off.
Some voltages:
PPBUS_G3H - 8.5V
SMC_PM_G2_EN - 3.42V
PP3V3_S5 - 3.32V
PP3V42_G3H - 3.42V
PPDCIN_G3H - 15.18V
PP5V_S5 - 5.04V
PP3V3_S5_REG_R... -
So Ive got a Macbook Pro here with no power or charging light.
I have taken the board out and did an inspection and found a small bit of water damage on C1267 (PP1V05_S0). Cap fell off as I cleaned the area but I dont think this is responsible for my no power or light issue, and should probably work just fine without it.
So after watching a few Louis Rossman videos and some post here with similar issues, Ive done a lot of testing and have found the following values of the main lines I think are important:
PPDCIN_G3H = 16.63V
PP18V5_DCIN_FUSE = 16.63V...
Comment