What are the fault repair methods for CMOS circuits?

Failures in the CMOS circuit can cause the motherboard to fail to boot, CMOS settings can not be saved, time is not accurate, or MOS settings can be saved after the screen is displayed on a black screen. The line between the button battery and the Southbridge chip, the voltage shortage of the Southbridge chip, and the fact that the 32.768 kHz real-time clock crystal does not vibrate or vibrate to standard values. Such

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1. Do not save CMOS settings for maintenance method.



1) Measure if there is more than 2.7 V in the jumper cap.



2) Check that the 32.768 kHz crystal oscillator is not vibrating.



3) If the above conditions are normal, you can first replace the resonant capacitor and the crystal oscillator.



4) Finally, replace the south bridge chip repair.



2. Time is wrong, time is fast or slow repair method.



1) Replace the 32.768 kHz real time clock crystal first.



2) It is not possible to replace the resonant capacitor after replacing the crystal oscillator.



3) Finally, replace the south bridge chip.



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3. Start the CMOS setup program and finish the black screen maintenance method.



1) First brush the BIOS data.



2) BIOS section write can not solve IO chip replacement.



3) Final replacement of Southbridge Flower Sheet, if the above repair is not repaired.



4. The main board does not start the maintenance method The third E-board start circuit measures the maintenance of the main board's standby state in a way that does not start the CMOS that depends on the main board start circuit The CMOS maintenance method is the third In accordance with the operating principle of the startup circuit of the motherboard in Chapter 7, the third step is to measure the standby state of the main board in the inspection and repair method of the startup circuit. On the motherboard



This article is from Allicdata Electronics Limited.