T70 1029 problem C333

NonesensE

Hi, sorry for writing in English, I'm from Germany.

I have a problem with my T70 board. At startup, everything is fine. After a moment, Windows 10 shows power surge on USB port every 4 seconds. And bluetooth is not recognised. After a few minutes the system gets unresponsive. At the end, I get a bluescreen, saying: DPC Watchdog Violation

I removed everything, even the screen and the cage. Only motherboard, RAM and keyboard. The problem persists.

Then I measured the 3.3V line at the display port. From 3.3V to GND. Across C333. I measured 140 ohms when cold, even less when warm. Probably the capacitor C333 is broken.

I could solder a new capacitor in place. What is the capacity of C333?

I would like to avoid shipping to China but I don't want to lose warranty. What should I do?

HOPE

QUOTE:

NonesensE 发表于 2017-7-21 03:00
Hi, sorry for writing in English, I'm from Germany.

I have a problem with my T70 board. At startu ...

Sorry for the issue. I will report to the developers and try to give you the solve method without shipping back.

laugh3

这位国际友人的料机有点尴尬

dacheng79

Guten tag

dacheng79

QUOTE:

HOPE 发表于 2017-7-21 05:12
Sorry for the issue. I will report to the developers and try to give you the solve method without  ...

A nice man.

a450795033

入门级英语学渣表示只能看个大概…

cship2001

So glad to see there is someone who is still using the old IBM type and 4：3 screen in foreigners！

sinfire

Hope的宝贝都漂洋过海到全世界啦！

jun527679962

我竟然大概看得懂这堆鸡肠.好厉害.

cookbook

其他人有没有出现过这个问题

jack-wu1982

Sound good! t70 has been sold for foreigners,

horihons - X62-15,2181

chrome直接帮我翻译了，我表示看懂了，把译文直接贴过来：

QUOTE:

嗨，抱歉用英文写作，我来自德国。

我的T70板有问题。在启动时，一切都很好。过了一会儿，Windows 10会每4秒显示USB端口的电源浪涌。蓝牙无法识别。几分钟后，系统无响应。最后，我得到一个蓝屏，说：DPC看门狗违规

我删除了一切，甚至屏幕和笼子。只有主板，RAM和键盘。问题依然存在

然后我在显示端口测量3.3V线。从3.3V到GND。跨越C333。冷时测量140欧姆，加热时更少。电容C333可能损坏。

我可以焊接一个新的电容器到位。C333的容量是多少？

我想避免运送到中国，但我不想失去保修。

song_1118 - T50-3

==========
       估计是C333坏了，不管具体作用，理论上换一个一样的上去应该是可行的------问题在于手艺。

think300

It looks like a problem with one of usb port, maybe short circuit or overload with usb power supply. Remove BIOS battery, usb devices and try again.

fish66887799

在线测电容的电阻有用么，能说明电容坏了么，建议用示波器测，更能说明问题。

NonesensE

QUOTE:

HOPE 发表于 2017-7-21 05:12
Sorry for the issue. I will report to the developers and try to give you the solve method without  ...

This is great, thank you!

NonesensE

QUOTE:

think300 发表于 2017-7-21 10:48
It looks like a problem with one of usb port, maybe short circuit or overload with usb power supply. ...

I already did this. All USB ports work fine except the one at the display connector where the bluetooth module is connected. The bluetooth module uses USB with a 3.3V power line. From the display connector, pins 18, 20, 22 and 24 go to the bluetooth module connector at the display cable. 20 and 22 are the data pins, 24 is ground and 18 is +3.3V. Pin 18 is coupled to ground via C333.

As the resistance from pin 18 to ground is too low, either C333 is broken or the voltage regulator is faulty. I think, C333 is more probable.

Google translation / 谷歌翻译:

我已经这样做了 除了连接蓝牙模块的显示器连接器，所有USB端口均可正常工作。 蓝牙模块使用带3.3V电源线的USB。 从显示器连接器上，18,20,22和24针将在显示屏电缆上进入蓝牙模块连接器。 20和22是数据引脚，24是接地的，18是+ 3.3V。 引脚18通过C333耦合到地。

由于从引脚18到地的电阻太低，C333被破坏或电压调节器故障。 我认为，C333更有可能。

NonesensE

QUOTE:

fish66887799 发表于 2017-7-21 11:20
在线测电容的电阻有用么，能说明电容坏了么，建议用示波器测，更能说明问题。

On-line resistance measurement would be nice, but is not so easy. If there is anything I should test with an oscilloscope, please specify. Then I will perform the measurement.

Google translation / 谷歌翻译:

在线电阻测量会很好，但不是那么容易。 如果有什么我应该用示波器测试，请指定。 然后我将执行测量。

zcarrt

直接给他换个新的吧

fish66887799

QUOTE:

zcarrt 发表于 2017-7-22 08:18
直接给他换个新的吧

要是通病，换也没用。

刘易斯

If it's just due to the capacitor, i think the problem could be easily solved by "HOPE". Good luck.

likehuan2005

欢迎你，德国的朋友！

HOPE

QUOTE:

NonesensE 发表于 2017-7-21 03:00
Hi, sorry for writing in English, I'm from Germany.

I have a problem with my T70 board. At startu ...

I contacted with the developers and the replied me saying the issue maynot be the C333, and maybe one resistance is dropped. they will make a new BIOS which  will bapass the current watch for you to test.

NonesensE

QUOTE:

HOPE 发表于 2017-7-26 09:45
I contacted with the developers and the replied me saying the issue maynot be the C333, and maybe  ...

Okay, thank you!

HOPE

QUOTE:

NonesensE 发表于 2017-7-27 01:50
Okay, thank you!

try to flash the bios, using ka.bat to upgrade. for any issues please post here, thanks.

tiefengfang

Hope老大，你上面贴出来的 170728 的 T70 BIOS 与 170717 有区别吗？其他人的 T70 能不能刷？

davidtam

QUOTE:

fish66887799 发表于 2017-7-21 11:20
在线测电容的电阻有用么，能说明电容坏了么，建议用示波器测，更能说明问题。

电容应该用电桥在线测才准

NonesensE

QUOTE:

HOPE 发表于 2017-7-29 13:00
try to flash the bios, using ka.bat to upgrade. for any issues please post here, thanks.

Before I tried to flash the new BIOS, I noticed that the problem is worse now. Windows and Windows installers won't start anymore. I tried Windows 10 and Windows 8, I tried two different USB sticks, I tried installing Windows on another machine and then plugging the SSD into the T70. The result was always the same.

This is the same for both the 170717 and the 170728 BIOS. Starting stops at the beginning of the loading screen:


Ubuntu is running fine, except that it doesn't recognise the bluetooth module.

After running for a few minutes, C333 was slightly warm, 30°C when the room temperature was 24°C.

Any further ideas? Otherwise I guess, I have to send it to you for diagnose and repair now.

HOPE

QUOTE:

NonesensE 发表于 2017-8-3 03:46
Before I tried to flash the new BIOS, I noticed that the problem is worse now. Windows and Windows ...

what's the type of SSD you installed on the T70?
try to install the original new Windows 10 on the T70, to see whether it can install successfully.

NonesensE

QUOTE:

HOPE 发表于 2017-8-3 10:01
what's the type of SSD you installed on the T70?
try to install the original new Windows 10 on th ...

I installed a 2.5" SATA SSD (Crucial M4).

I already tried to install Windows 10 again. The T70 does freeze when starting from a Windows installation USB drive. Like in the picture above. I tried this with two different USB drives, one USB 2.0 and one USB 3.0.

When I first posted here on July 21, I had this issue when the system was warm after a bluescreen. After cooldown for an hour, it worked again. Now, I have this issue always, even when the T70 is cool.