Sharing: the third part of the computer motherboard failure codes

Above-mentioned,

0D, 1, Check whether the CPU speed matching the system clock. 2. Check the control chip programmed value meets the initial setup. Video channel testing, if it fails, the speaker will tweet.

NOP command has been processed, then test cmos stopping register. The first 64K RAM parity failure.

.... read more

Sharing: the second part of the computer motherboard failure codes

Above-mentioned, 

04, Make 8042 keyboard controller reset, verify TESTKBRD, keyboard  controller soft reset / power test .

      Programmable interval timer test in progress or failure.

05, If repeated manufacturing test 1-5 , 8042 available control state,... read more

Sharing: the first part of the computer motherboard failure codes

Usually, we repair computer motherboards, in addition to rely on our maintenance experience, 

we have a better way that using the fault diagnostic card. so we sharing some fault codes :

Generally code: 

FF,00,C0,D0,CF,F1     means cpu testing does not past.

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How to judge whether the north bridge damaged ?

Chipset is one of the most important components of computer motherboards, it has two kinds of model, south bridge and north bridge. Chipset is one of the most easily broken components, too. So, here we share some fast identifying method whether north bridge damaged. 

1, Direct measuring the capacitances on north bridge. If there is short circuit, then the north bridge was damaged. ....read more

Computer automatically boot when connected to AC power, why?

A new computer connected to AC power every time, did not press the power button, but it  automatically started, the system is normal, everything is ok. But why it automatically starts when connected to AC power every time?.... read more

Do you use reballing chip to repair computer ?

What's reballing chip ? First it is bga, in fact, the reballing chip is used chip, renew welding solder balls, sometimes it may be refurbished.... read more

How to solve gpu thermal defects of DELL 1400, 1420 , D620 ?

Computer maintenance engineers know some old laptop have graphics card failure. such as DELL 1400, 1420 , D620 ect , The graphics card often appears crash problem, In fact , .... read more

The computer automatically restarts, why?

The computer always restarts automatically, what's the reason?

Usually we may try to check the following several aspects: .... read more

Share repair data: some parameters of nvidia gpu

What's gpu ? It's full name is Graphic Processing Unit, gpu is one of the most important chips of motherboard. Usually there are two kinds of model gpu, nvidia gpu and ati gpu, amd has merged ati already, and ati gpu is called vpu, too. .... read more

Do you know how to use the two most important diagnostic tools ?

Now, the computer fault has been more and more complex, this is a challenge for every repair engineer, in addition to relying on the repair experience, we need some repair tool, too. 

The fault diagnostic card is very good tool, ....read more

A common problem - Lenovo B470 does not trigger

There is a Lenovo B470 notebook, CPU is I3, chipset is BD82HM65, discrete graphics, three generations of memory, BIOS chip is 25L3206. 

The notebook does not boot, ..... read more

Common causes of motherboard failure and repair methods

The motherboard is one of the most important computer parts, it is damaged easily, too. So, we often repair the motherboards. Here, we exclude software failures, summarizes some failures in hardware.

The causes of motherboard failures include three aspects:  read more

Do you know the meaning of gigabyte motherboard number ?

Gigabyte motherboard is one of the commonly used computer motherboard, the motherboard No. represents a certain meaning. Gigabyte motherboard usual use D,Q,S,and digit as a suffix, to show the quantity of high-end technology support. .... read more

How to remove bga chip with glue ?

If we repair motherboard, sometimes there are some bga chips with red glue, It will be a very trouble thing when you want to remove it. How to remove ? ..... read more

CMOS setup can not be saved after replace a new battery, why ?

http://www.htic-tool.com/index.php?main_page=news&c_id=2&chapter_id=5

How to detect three kinds of motherboard failure ?

http://www.htic-tool.com/index.php?main_page=news&c_id=2&chapter_id=4

How to maintain bga solder balls ?

http://www.htic-tool.com/index.php?main_page=news&c_id=2&chapter_id=3