Re: MacBook pro 820-315 CPU Vcore, no shime no picture, no brain. Help Guys.
Hello everyone.
Who are good skills to fix macbook pro 13" 820-3115?
In last few weeks got few macbook with the same problem, they don't have brain.
Some one can explain going communication between PCH-CPU-SMC-BIOS.
I'm not good enough with CPU.
I hope so some master takes time to explain detailed how it's working.
Watched Louis on youtube, but hes just showing how to fixing and no detailed explanation.
If some one makes good post it will hell for...
nerkkka
Member
Last Activity: 07-13-2020, 10:15 AM
Joined: 06-30-2018
Location: Linconlshire
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Re: MacBook pro 820-315 CPU Vcore, no shime no picture, no brain. Help Guys.
Thanks for your big help. I will try what you have said, if can't fix this boards then I have more boards for spares
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Re: MacBook pro 820-315 CPU Vcore, no shime no picture, no brain. Help Guys.
No any beep, just starts and runs. I don't have a lot of experience with CPU vcores. If all rails are working, then I thing dead CPU. What resistance should be on CPU vcore and on the AXG?Leave a comment:
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Re: MacBook pro 820-315 CPU Vcore, no shime no picture, no brain. Help Guys.
What you know about PPVCORE_S0_AXG? Because it is missed. Have checked on working board and there was around 0.5V. I have few boards with the same issue, that's way I would like to figure out and fix these boards.Leave a comment:
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Re: MacBook pro 820-315 CPU Vcore, no shime no picture, no brain. Help Guys.
Hi. Thanks for a fast replay.
I have tried bios chip from another board, also tied reset SMC and PRAM. CPU_RESET_L is present 1.05V.
What else can be wrong with this board? If dead CPU then will put them to spares.
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MacBook pro 820-315 CPU Vcore, no shime no picture, no brain. Help Guys.
Hi. All the time I found answers in the google, but this time I can't find anything. I have macbook pro logic board 820-3115-b. The problem with this board is: Fan spin in full speed, no image no chime. Have troubleshooted all rails is pressend except no voltage on PPVCORE_S0_AXG_R. Have replaced U7400 three times plus mosfet at the same time, replased SMC. No idea what can be wrong with this board.
U7400
Pin 13; 1.42V
Pin 45; 5.04V
Pin 4; 0.05V
Pin 24; 3.3V
pin 12; CPUIMVP_AXG_PGOOD voltage 0.19V,
pin 13; CPUIMVP_AXG_PWM2... -
Re: MacBook Pro 13" 820-3115 - No LCD_IG_PWR_EN
Chears mate
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Re: MacBook Pro 13" 820-3115 - No LCD_IG_PWR_EN
Any one can replay to my question?
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MacBook Pro 13" 820-3115 - No LCD_IG_PWR_EN
Hello guys, Have problem with display, the external display works fine, mac's lcd totaly black. All voltages is present except on u9000 pin 1 which is gate, pp3v3_s5 is present. Any idea what can be? I think about u1800, if this IC broken then I have some problems
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820-00875 Schematic and Boarview
Here you go boardview and schematics
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Last edited by nerkkka; 07-05-2018, 10:07 AM. -
Re: New Members - please post your introductions here
Hello everyone. I'm Nerijus from UK and started learn to repair macbook's, Hope to get more experience, may I help if I can.Leave a comment:
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