Weak current College】 【notebook of various fault detection steps.

First, no power (power led not lit)
1. check the adapter or power port, make sure the main power supply to protect isolated circuit.
2. check the power on switch.
3. replace power supply Board (for the power plate separation of model) test.
4. maintenance of the motherboard.

Second, the power led is on but the system is not running, nothing is displayed on LCD
1. press the power switch and turn the power off for four seconds, and then restart the check start normally.
2, external CRT monitor is displayed properly.
3. replace the memory.
4, clearing the CMOS.
5. replace the memory, CPU.
6, maintenance motherboard

Fourth, the panic, the blackout
1. check the cooling system.
2. minimum system testing.
3. to reinstall your operating system.
4. maintenance of the motherboard.

5. video corruption
1. the external monitor to see properly.
2. Add the same video:
1) replace the memory test;
2) reinstalling the video driver;
3) detect the video chip is virtual welding;
4) video BGA or replace the motherboard.
3. Add normal:
1) reinsertion pingxian ends;
2) plus welding pingxian interface;
3) replace pingxian;
4) replace the LCD;
5) video BGA or replace the motherboard.

Six, anping
1. replace the LCD to judge whether the lamp is damaged.
2. damage to the tubes, replace the lamp.
3. lamp is not bad, check the pressure plate meets the basic working conditions.
4, are not met, check the signal source section; meet, replace the pressure plate.

7. no sound
1. check the volume adjustment is correct.
2. check the sound card driver is installed correctly.
3. check the speaker connection.
4. check the speaker damage.
5, inspection, replacement power amplifier, audio chip.
6. replace the motherboard.

8. keyboard problems
1, judging by test program
2. check the keyboard cable is unplugged
3. replace the keyboard test to determine if the keyboard is damaged
4, keyboard, maintenance, replacement keyboard
5. change keyboard failure persists, check the keyboard cable connector
6. replace the keyboard chip
7, maintenance, replacement motherboard

9. touch pad does not work
1. check whether there is an external mouse access and MOUSE test program detection properly.
2. check the touch pad cable is connected correctly.
3. replace the touch pad
4. check the keyboard control chip exists Xu Han
5, maintenance, replacement motherboard

10. USB port does not work
1, check the BIOS setting USB port is set to "ENABLED".
2. reinsert the USB device, check whether the connection is working properly.
3. check the USB port driver and USB device drivers are installed properly.
4. check and replace the USB port.
5. check for the existence of virtual welding South Bridge.
6, nanqiao BGA or replace the motherboard.

11. fan problems
1, with FAN test has detected correctly, when the fan is powered on.
2. test the fan wiring for good.
3. test the fan is good.
4. replace the fan controller chip.
5, bad motherboard

12. serial port device does not work
1, in the BIOS Setup, check the serial port is set to "ENABLED"
2, with SIO test program detection properly.
3. check the serial port device is properly connected.
4. If a serial mouse, check the BIOS settings to turn off the built-in touchpad; check the serial mouse driver is installed properly.
5. check the serial chip.
6. check the southbridge chip on the motherboard for the existence of a virtual cold welding and soldering.
7, repair and replace the motherboard.

13. parallel port device does not work
1, check the BIOS settings and port is set to "ENABLED".
2, with PIO test program detection properly.
3. check all the connections are correct.
4. check the external device is powered on.
5, check the printer mode settings are correct.
6. check the southbridge chip on the motherboard for the existence of a virtual cold welding and soldering.
7, repair and replace the motherboard.

14. battery identification in Windows is not working properly
1. confirm that the power management features in the operating system is started and set up correctly.
2, the battery charge three hours before use.
3. the battery charge and discharge twice and then try again.
4. replace the battery.
5. Inspection Board

13. driver problem symptoms
1. display does not function properly;
2. sound card does not work;
3, Modem, LAN does not work
4, you cannot use the QSB
5, some hardware because there is no load driver or drivers loaded is not correct and not normal use

14, operating system, the symptom of the problem
1. the system runs slow
2. the blue screen of death,
3, can not be normal shutdown
4, system errors