Ремонт: Ноутбуков, Компьютеров
https://vlab.su/

Hp Omni 120 (DAOWJ7MB6E0) no video and no response.
https://vlab.su/viewtopic.php?f=53&t=51171		 Страница 1 из 1
andromedax [ 26 сен 2016, 12:34 ]
Заголовок сообщения:  Hp Omni 120 (DAOWJ7MB6E0) no video and no response.
Hp Omni 120 DAOWJ7MB6E0

Hi,

I am trying to repair a hybrid desktop/notebook without image.

The computer stars to function as soon as 19v. connector is plugged.
The power consumption from 19v. adapter is 1500 milliamps.
It has an Intel core ix and has two bios chips, that I already have re-progarammed.

There seems that there is not schematic for this board, and is very difficult to follow voltages an signals.

Both bios chips has pulses in its pin 1 to select device, but seems that it hangs during POST.

There is no beeps booting without ram memories.

All pwm voltages seems good, cmos battery is also good, and cpu/ chipset gets a normal temperature.

Does anyone knows if this mobo has to beep without memory?

What do you think?
andromedax [ 27 сен 2016, 22:06 ]
Заголовок сообщения:  Re: Hp Omni 120 (DAOWJ7MB6E0) no video and no response.
I have made a mistake with the motherboard model number, the correct model is DA0WJ5MB6F0 rev. F :-(
andromedax [ 30 сен 2016, 20:08 ]
Заголовок сообщения:  Re: Hp Omni 120 (DAOWJ7MB6E0) no video and no response.
Цитата:
All pwm voltages seems good,


motherboard: DA0WJ5MB6F0 rev. F (Hp Omni 120 AIO)

Not all voltages are present, +VGFX_CORE is missing due to pwm circuit (NCP5911 and associate mosfet) is not working.

This NCP5911 chip, is controlled by a NCP6131 pwm chip, (IMVP7 1-, 2-, 3-Phase CPU Controller + 1-Phase GPU Controller) but is not clear, (seeing in other schematics with same chips) how this voltage is controlled. (which signal)

A capture from FOXCONN CHICAGO_HR_HPC schematic, is attached showing part of this circuit.

Thanks for some feedback.

Вложение:
+VGFX_CORE.jpg
Страница 1 из 1 Часовой пояс: UTC + 4 часа
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group
http://www.phpbb.com/