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ASUS x450v notebook computer speaker no sound repair
Machine model: ASUS x450v
Motherboard version number: x450cc 2.3 sound card model: alc277
Fault phenomenon: no sound from laptop headphone speaker
Maintenance process: a ASUS x450v notebook computer was sent for repair by the colleague. The earphone speaker did not sound, and the sound card chip was invalid.Can enter the system, sound card drive is normal, there is no exclamation mark, the horn icon in the lower right corner is available, the control panel can be tested, there is no sound, there is no response when earphone is inserted.Enter the PE test, open the official drive, replace the system and other faults remain.
ASUS x450v notebook computer speaker no sound repair Figure 1
First replace the sound card chip, the test is invalid.Open Boardview to test the working conditions of sound card.
ASUS x450v notebook computer speaker no sound repair Figure 2
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ASUS x450v notebook computer speaker no sound repair Figure 4
Test VCC, 1, 25, 38, 39, 46,VCC is normal, and the reset signal of CLK is synchronized. 5.6.10.11 is also normal. If the headphone interface is removed, the problem is still the same.
ASUS x450v notebook computer speaker no sound repair Figure 5
Check out the reference data book, alc272 and alc882.
ASUS x450v notebook computer speaker no sound repair Figure 6
ASUS x450v notebook computer speaker no sound repair Figure 7
The measurement datum is VCC,27 pin and Diode value is normal, but there is no VCC. The problem is found.
ASUS x450v notebook computer speaker no sound repair figure 8
The chip has no benchmark, and the third sound card is still faulty.After analyzing the data book and Boardview, we know that the benchmark VCC comes from VCC 5v. As long as there is 5V, there will be 2.5 or other VCC inside.
ASUS x450v notebook computer speaker no sound repair Figure 9
ASUS x450v notebook computer speaker no sound repair Figure 10
The chip 27 pin diode value is OverLoad, and the installed chip diode value is 638, which indicates that PCB layer has no problem.
ASUS x450v notebook computer speaker no sound repair Figure 11
Replace the fifth chip, change the installation method, from the bottom of the heating and welding, quasi VCC came out, sound, headphone sound!
ASUS x450v notebook computer speaker no sound repair Figure 12
ASUS x450v notebook computer speaker no sound repair Figure 13
Plug in the earphone to detect, the sound is normal together, the problem is solved.
ASUS x450v notebook computer speaker no sound repair Figure 14
