迅维网

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.

1.jpg
登录/注册后看高清大图


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

5.jpg
登录/注册后看高清大图

2.jpg
登录/注册后看高清大图


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)

4.jpg
登录/注册后看高清大图


3.jpg
登录/注册后看高清大图


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

6.jpg
登录/注册后看高清大图


13.jpg
登录/注册后看高清大图


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

7.jpg
登录/注册后看高清大图


8.jpg
登录/注册后看高清大图


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


This is signal DRVON Enable


This is signal CPU Core


Final Stage


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

                               
登录/注册后看高清大图

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




欢迎光临 迅维网 (https://www.chinafix.com/) Powered by Discuz! X3.4