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andromedax
[ТС]
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Заголовок сообщения: Macbook Pro 13" A1708 (820-00840-A) No image Добавлено: 16 май 2019, 20:36 |
Начинающий |
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Зарегистрирован: 01 май 2015, 00:34 Наличности на руках: 3.60
Сообщения: 262 Откуда: Alicante, Spain
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Hi, another weird problem with a macbook.
I'm trying to repair this Macbook Pro 13" A1708, (820-00840-A) it has no image, but backligth is working ok.
All voltages are good, but has no vcore. L7410, L7420 and L7430 have voltage (cpu vcore) but only for half a second.
The weird thing is that cpu gets hot, and fan spins. (also osx pendrive install usb, blinks as it were booting from it)
Someone experienced something like this?
Could be a damaged cpu or bios corrupted?
Thanks in advance.
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Shooter75
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Заголовок сообщения: Re: Macbook Pro 13" A1708 (820-00840-A) No image Добавлено: 17 май 2019, 15:39 |
Инженер |
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Зарегистрирован: 23 фев 2011, 12:57 Наличности на руках: 2,195.34
Сообщения: 2200 Откуда: Chisinau, Moldova
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Do You understand "video-source"? Video-drain is antipod of. Wow - Any external/internal display. Without any V-D, vcore don't appear. 1. Verify AUX ch at eDP on MB. 2. If no detection packets appears - GT2.eDP channel is damaged. 3. And measure eDP-mux(TB-host), if it has it's power when You connecting external display. 4. If You have same situation with AUX ch at TB-host, - Your GT2 is damaged. You can backup Your original EFI and try any from 00840 with cleared ME. This will not to be stable, but You can detect efi-crashes.
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andromedax
[ТС]
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Заголовок сообщения: Re: Macbook Pro 13" A1708 (820-00840-A) No image Добавлено: 17 май 2019, 19:37 |
Начинающий |
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Зарегистрирован: 01 май 2015, 00:34 Наличности на руках: 3.60
Сообщения: 262 Откуда: Alicante, Spain
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Shooter75Цитата: Do You understand "video-source"? Yea, it is clear for me now. I'm going to test the communication with lcd panel and will post the results. Thanks again.
[size=85] Posted after 3 hours 27 minutes 32 seconds:[/size] Цитата: Verify AUX ch at eDP on MB. Hi, I have measured EDP_INT_AUX_N signal and EDP_INT_AUX_N, and both have a burst of pulses in the boot process. Probably these pulses don't get its destination to lcd, so I'm going to order the flex cable and test again. I have also measured pwm circuits for PPVCCGT_S0G voltage, and only get pulses for a moment at pin 1 of coil L7410. Pin 1 of L7420 and L7430 has nothing. If the new flex video cable doesn't solve the problem, I will investigate if there is a problem with phase 2 and phase 3 of PPVCCGT_S0G pwm circuit. Thanks and hope to have good news soon.
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Страница 1 из 1 [ Сообщений: 7 ] |
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