10 cases of typical faults of notebook computers

Fault Case 1: COMPAQ 1800 can not enter the OS when it’s start up, just alarms and it sounds like “Didi”.  In this case, open the memory slot, replacing memory, troubleshooting. Fault Case 2: SONY GR250 boot in DOS mode, there are blue color cross-stripes.  After entering Windows2000 System failure remains the same, external CRT and LCD monitors display the same phenomenon.  And often crash.  At this case, unplug the graphics board and re-inserted (this model graphics board and the board is separate from the slot through the cellular connection), forced the board pressed uniform, troubleshooting.  This phenomenon is caused by poor contact Huaping cards, laptops for this phenomenon is usually needed to do the display chip BGA soldering. Fault Case 3: When the COMPAQ N800V is running for some time, the system automatically re-starting again, touch the bottom of the laptop, it’s hot.  Open the machine inside and power-examination, CPU fan is turning, but it’s slower than usual, it’s high temperature if you touch the U radiator when your laptop enter the Operation System, and the fan is still very slow.  Slow fan speed can not be promptly put the heat emitted, leading to CPU temperature is too high and repeated re-starting.  Replace the CPU fan troubleshooting. Failure Case 4: Press the SONY GRX700 power switch but nothing happens, insert the power adapter, the battery charge indicator light do not response.  Disassemble and measuring DC-DC voltage and they are normal, the boot voltage is 3V, To-ground voltage is 0V.  This case can be judged as BIOS protection fault, it need to unplug the BIOS backup battery, shorted connect the two pins for 1 ~ 3 seconds.  And then install the backup battery, start testing, troubleshooting. Failure Case 5: SONY GR100 boot normally, the screen backlight is flashing after a period of time running. It may be caused by  LCD screen backlight high-pressure plate performance instability. Just to replace a backlight Inverter, troubleshooting. Failure Case 6: Lenovo E200C boot, and then crash after the icon appears.  Disassemble and replace the BIOS chip, or to re-brush and write the new procedures.  Such failures are mostly caused by damage of BIOS, the host can not be completed self-test. Failure Case 7: COMPAQ X1000 can not enter the system, re-formatted the hard disk to install the new system but still can not enter the system.  With the FORMAT command to format the hard disk that there was no bad sectors.  After replacing a hard disk installation system and troubleshooting. Failure Case 8: SONY 505LS boot and found half the liquid crystal display can show, the next half is black.  Like this is very clear that after the replacement of liquid crystal displays troubleshooting.  Such failure of LCD is quite difficult to repair them, needs some professional equipment can. Failure Case 9: IBM A21 can not charge the battery, single-plug power adapter can not boot.  With the battery can be a normal boot.  Disassemble components detected in the power adapter into mouth Sealing-off, repair welding after troubleshooting. Failure Case 10: IBM R32 no boot after the LCD display, but the power and hard disk light is working correctly.  External display shows normal.  Suspected of LCD data lines damaged, replace the LCD data lines remain after the failure.  Replacement of LCD monitors, troubleshooting.  Such failures are mostly LCD damage.  If you are unsure, you can replace the LCD monitor to detect liquid crystal display good or bad. Related: Sony VAIO VGP-BPS8 battery, Hp mini 1000 battery, Dell Inspiron 6400 battery

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