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标题: Acer Aspire M3970 CPU Core no voltage [打印本页]

作者: vusalcrm 时间: 2020-4-17 04:39
标题: Acer Aspire M3970 CPU Core no voltage
本帖最后由 vusalcrm 于 2020-4-17 05:00 编辑

Acer Aspire M3970
Motherboard code: IPISB-VR REV 1.01
PCH - HM67
There was a trigger when I examined the motherboard. but the voltage was cut off. maintenance on the motherboard in another service.
I examined the bios chip is broken. BIOS programmer - chip read error message. i bios chip replace.

there was a result. this time the motherboard started normally.
RAM +1.5v/ PCH +1.05v/ +1.8v - OK
CPU Core and GFX Core voltage - 0V
this time I started to examine the cpu circuit . CPU PWM - NCP6151

main voltage and enable signal normal. VRM_PWRGD - 0V (this is normal . because the circuit is not working)
this motherboard has 4 phase main coil. one coil GFX Core (intel hd graphic)
there is also an Buck MOSFET Drivers for core voltages (NCP5901)

later i realized that the Enable signal is too low ( +236mV) . this signal is normally +5V
DRVON - generates its signal in CPU PWM. I measured CPU PWM DRVON signal

this signal is low due to another reason. i remove PR330. (2.2ohm)
I started the motherboard and the result is good. DRVON signal +5.0V OK

There is no problem in its CPU PWM then.
I applied a method.
Buck MOSFET Drivers (NCP5901) - I cut the activ signals . Remove PR212 (0 ohm)
if no result, I would apply this method for the other PU15, PU16, PU17, PU18, PU19 and PU20(GFX)
I first applied this method PU14

Motherboard has started. DRVON enable signal is active (+5V). Motherboard gave beep signal 4 times. cpu on motherboard was broken
I wasn't sure the CPU was running because the motherboard was not working normally.
Replace CPU and worked

CPU Core +1.04V and GFX Core Voltage +0.4V

Replace NCP5901

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2020-4-17 04:36 上传

This is signal DRVON Enable

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2020-4-17 04:37 上传

This is signal CPU Core

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Final Stage

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2020-4-17 04:37 上传

Work BIOS
IPISB-VR REV 1.01 BIOS (4MB)

ipisb-vr rev1.01 HM67 4MB.zip

1.83 MB, 下载次数: 17, 下载积分: 下载分 -2 分, 下载 1 次

ipisb-vr rev1.01 HM67 4MB.rar

作者: wpyjp 时间: 2020-4-17 11:17
外国兄弟,支持支持

作者: 被罰站的樹 时间: 2020-4-17 11:48
NB ,一整篇我都是翻译着在看

作者: 艾尔玛 时间: 2020-4-17 13:04
搞英文看不懂哦。。

作者: 雨天扔伞 时间: 2020-4-17 13:31
老外拿775老板子在练手？？

作者: rongshan 时间: 2020-4-17 13:42
国外同行帖子水准挺高

作者: ?For、 时间: 2020-4-17 14:04
The technology is really good, I hope to share more maintenance experience.

作者: Linshengqiang 时间: 2020-4-17 17:17
全是E文果真是老外搞机

作者: H55 时间: 2020-4-18 01:11
修得还行！where you from? Boy !

作者: 维修积体 时间: 2020-4-18 01:31

雨天扔伞发表于 2020-4-17 13:31
老外拿775老板子在练手？？

PCH-HM67 1151

补充内容 (2020-4-18 20:06):
錯 1155

作者: vusalcrm 时间: 2020-4-18 03:22

H55 发表于 2020-4-18 01:11
修得还行！where you from? Boy !

i live Azerbaijan

作者: 13644455541 时间: 2020-4-18 19:38
国际友人吗？啥都没明白

作者: 冯本本 时间: 2020-4-18 19:39
全是英文果真是老外搞机

作者: 87252a 时间: 2020-4-18 22:48
来个翻译翻译

作者: 黄叶168 时间: 2020-4-18 23:24
The signal will be cut off if you remove the pr212，then the pu14 would be disabled，can it generated the voltage？

作者: 科迈电脑维修 时间: 2020-4-18 23:25

雨天扔伞发表于 2020-04-17 13:31
老外拿775老板子在练手？？

不是775.应该是115x

作者: vusalcrm 时间: 2020-4-19 03:42
LGA 1155 Socket

作者: xtwx 时间: 2020-4-19 08:38
阿塞拜疆的坛友

作者: liupinganxinkej 时间: 2020-4-19 08:55
外国兄弟,支持支持

作者: HelloKitty2018 时间: 2020-4-19 10:45
全整因为牛逼。

作者: HelloKitty2018 时间: 2020-4-19 10:45
全整，英语牛逼

作者: 无名而为 时间: 2020-4-19 14:58
国际友人厉害了

作者: suyajuncn 时间: 2020-4-19 17:31

老外拿775老板子在练手？？

作者: vusalcrm 时间: 2020-4-19 19:27

suyajuncn 发表于 2020-4-19 17:31
老外拿775老板子在练手？？

CPU support 2gen and 3gen (i7)
LGA1155 socket

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