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lapmaniac
[ТС]
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Заголовок сообщения: Acer Aspire 5942G (COMPAL LA-5511p rev 2.0) Shutdown after 5 minutes Добавлено: 25 июл 2022, 12:39 |
Я тут случайно |
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Зарегистрирован: 25 июл 2022, 12:16 Наличности на руках: 2.00
Сообщения: 1 Откуда: Hellas
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Dear friends,
I would like to help me solving the problem i have. My favorite laptop Acer aspire 5942g motherboard is totaly destroyed from my bad luck attempt to reflow the BGA chip. So the original m/b is off now. Fortunately, i had bought another m/b with some problems and i decided to give a second chance. The new m/b has the problem that with no RAM, no CPU placed and giving power 19VDC, it lights the 3 blue lights. Then, when i pressed the POWER button, it goes on for 3-5 sec and then goes off. I 've found broken parts which i' ve replaced (PU7), a FET and a transistor, and then i clean the m/b well and put fresh thermopaste above the 3 main chips (CPU, BGA, VGA). I've measure +5VALW, +3VALW. After then, when i press the power button, it goes on and i have image through VGA cable. I connect then the HDD and it goes into windows. I was very glad but unfortunately, the laptop goes off after 5 minutes. I did that many times and the laptop goes off even into welcome screen BIOS settings after 5 minutes no matter what. Flash the BIOS with version 1.05, no luck. I took off the RAM, the CPU and starting measures. So far i have: No pressed power button: +3VALW, +5VALW, +0.9V to PL11. Total current is about 200mA After press the Power button: +3VALW, +5VALW, +1.5V, +1.8V +1.1V (no battery connected). Total current starts from 200mA and goes up to 2.3A. Screen in VGA monitor is OK.
A strange measure i get is the VGA_ON signal that has 3.3V without pressing the power button. Is that normal? Also, i get +1.0V to PL7 which is strange too. Looking the schematic, i noticed than the signal DGPU_PWR_EN is pressent with +3.3V. Is that normal too? What conditions must have to get this signal corectly?
I would apreciate any help. PS. A good boardview file would be very helpfull to find points for measuring.
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gs84
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Заголовок сообщения: Re: Acer Aspire 5942G (COMPAL LA-5511p rev 2.0) Shutdown after 5 minutes Добавлено: 14 авг 2022, 13:28 |
Инженер |
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Зарегистрирован: 17 авг 2011, 01:50 Наличности на руках: 0.50
Сообщения: 1351 Откуда: 乌克兰
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lapmaniac писал(а): Total current is about 200mA the consumption is too much before powers on While the laptop is up and running, have you checked all peripherals? Where did you take the bios dump to flash?
_________________ 兰克乌是松尔赫, 你操舰军斯罗俄
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Страница 1 из 1 [ Сообщений: 4 ] |
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Вы не можете начинать темы Вы не можете отвечать на сообщения Вы не можете редактировать свои сообщения Вы не можете удалять свои сообщения Вы не можете добавлять вложения
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