blazzelia
Member
Last Activity: 12-01-2024, 10:22 AM
Joined: 11-28-2019
Location: Iasi
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Any other idea? -
What does it means?...Leave a comment:
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No fans spinning...Leave a comment:
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R7021 and R7022 are both intact and have 10 Ohms.Leave a comment:
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Very confusing ... the board was sitting on my desk since my last reply, so about 3 weeks away. At first the voltmeter showed 3.7-5V, then up to 12.4, then down again, then 12,4 for minutes until I got bored waiting for a change. Powered off, tried again - 12.4V. I put the MB away and check it the next day - 12.4V. At some point I just left the MB powered on, decided to get back to it in about half hour. After a few minutes the green light from the magsafe went off. I reconnected it - green light and 12.4V, and the magsafe did not go off. Not sure if that tells anything...
The resistance...Leave a comment:
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Sorry for the delay ... long working hours ...
So, ping 1 on C7205 - oscillating
Same for both sides of R7940.
Regarding U7201, do you mean the voltage on all pins?...Leave a comment:
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Any other idea?...Leave a comment:
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I did that, the fans won't start, the voltage levels are unchanged, the pulsing rails still pulsing....Leave a comment:
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I've checked its value - it has 300uF (the schematic says it should be 220uF). In any case, it seems to be ok. The voltage levels are unchanged without this capacitor....Leave a comment:
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Not yet, will do it and report back. ThanksLeave a comment:
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RAM was still in but the signals are the same without it.
I pulled C7205 to measure it - 9.6uF. When I measure the voltage on it (PP5V_S5) there is a clicking noise - I guess it's comming from one of the inductors from the back of the board....Leave a comment:
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Two of the EN signals also pulsing, one in 0V. The current sensing resistors are fine....Leave a comment:
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[B]PP5V_S5[/B] - 100K
[B]PP5V_SUS[/B] - 290K[B]PP5V_S5[/B] - 100K
[B]PP5V_SUS[/B] - 290K[B]PP5V_S5[/B] - 100K
[B]PP5V_SUS[/B] - 290K[B]PP5V_S5[/B] - 100K
[B]PP5V_SUS[/B] - 290KLeave a comment:
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Here they are:
PP5V_S5 - osc
PP5V_SUS - osc
PP5V_S3 - 0
PP5V_S0 - 0
PPBUS_G3H - 12.5
PPVIN_S5_HS_COMPUTING_ISNS - 12.5
PPVIN_S5_HS_GPU_ISNS - 12.5
PPVIN_S5_HS_OTHER_ISNS - 12.5
PPDCIN_G3H - 16.7
PP3V42_G3H - 3.4
PPVRTC_G3H - 3.4
PP3V3_S4 - osc
PP3V3_SUS - osc
PP3V3_S5 - osc
PP3V3_S3 - osc
PP3V3_S0 - osc
PP3V3_T29 - 0
PP1V05_T29 - 0
PP15V_T29 - 0
PP1V8_S0 - 0
PP3V3_S0GPU - 0
At this point I stopped with the 1.8V/1.5V/1.2V/1.05V...Leave a comment:
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It starts with a few MOhms, then quikly drops and stabilize around 19 KOhms.Leave a comment:
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PP3V3_S5 - oscillating
PP3V3_S0 - oscillating
PP1V05_S0 - 0V
P1V5S0_PGOOD - 0V
P1V8S0_PGOOD - 0V
P5VS3_PGOOD - 0V
CPUVCCIOS0_PGOOD - 0V
PVCCSA_PGOOD - 0V
So I went on the PP3V3_S5 line which comes out of Q7260 through L7260 and I'm lost here ... P3V3S5_TG is oscillating, PPVIN_S5_HS_OTHER_ISNS is a solid 12.5V, P3V3S5_DRVL is oscillating....Leave a comment:
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ALL_SYS_PWRGD - 0VLeave a comment:
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YesLeave a comment:
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Hi,
PPBUS_G3H - 12.5V
F7000 - I only see F7040 and F7041 in my board schematic, both connected to PPBUS_G3H, both ok, 12.5V on both ends
SMBUS_SMC_BSA_SCL - 3.4V
SMBUS_SMC_BSA_SDA - 3.4V
BestLeave a comment:
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MBP A1286 820-2915 green light only, no start
Hi guys,
I have this 2011 MBP - the company I was working for, bought it at the time for a project and gave it to me after that. Later on, I gave it to my daughter which used it for normal internet browsing and office apps. At some point the, now famous, AMD GPU issue hit this laptop as well. I disabled the use of the AMD GPU following some information I found at the time (the one that, at the end, one moved AMD kext drivers to a backup location). So the laptop was using the CPU graphics and it was ok for the said daily usage. I even replaced the drive with an SSD one and it was operating...
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