Second, fix ASUS X450V notebook headset speaker without sound

Second, fix ASUS X450V notebook headset speaker without sound.

When the chip is disassembled, the resistance value of 27 pins is infinite, and the resistance value of the installed chip is 638, indicating that there is no problem with the board layer. Replace the fifth chip, change the installation method, heat and weld from the bottom, the quasi-voltage comes out, the sound is there, and the headphone sound is there!

Machine model: ASUS X450V

Main board version number: X450CC 2.3

Audio card model: ALC277

Malfunction: No sound from the speaker of the laptop headset.

Maintenance process:

A colleague sent an ASUS X450V notebook computer for repair, but there was no sound in the earphone speaker. Changing the sound card chip was invalid. Can enter the system, the sound card drive is normal, there is no exclamation mark, there is a horn icon in the lower right corner, the control panel can be tested, there is action without sound, and there is no response when plugging in headphones. Enter the PE test, hit the official driver, change the system and other failures.

Second, fix ASUS X450V notebook headset speaker without sound Figure 1

Second, fix ASUS X450V notebook headset speaker without sound Figure 2

Replace the sound card chip first, but the test is invalid. Open the bitmap and test the working conditions of the sound card.

Second, fix ASUS X450V notebook headset speaker without sound Figure 3

Second, fix ASUS X450V notebook headset speaker without sound Figure 4

Second, fix ASUS X450V notebook headset speaker without sound Figure 5

Test power supply, 1,25,38,39,46 power supply is normal, synchronous clock reset signal, 5.6.10.11 is also normal, remove the earphone interface, the problem is still the same.

Second, fix ASUS X450V notebook headset speaker without sound Figure 6

Check the data sheet, namely ALC272 and ALC882.

Second, fix ASUS X450V notebook headset speaker without sound Figure 7

Second, fix ASUS X450V notebook headset speaker without sound Figure 8

Measuring reference voltage, 27 feet, normal resistance but no voltage, problem found.

Second, fix ASUS X450V notebook headset speaker without sound Figure 9

There is no benchmark for the chip, and then the third sound card is changed, and the failure is still the same. After analyzing the data sheet and the bitmap, we know that the reference voltage comes from the power supply of 5V, and as long as there is 5V, there will be 2.5 or other voltages inside.

When the chip is disassembled, the resistance value of 27 pins is infinite, and the resistance value of the installed chip is 638, indicating that there is no problem with the board layer.

Second, fix ASUS X450V notebook headset speaker without sound Figure 11

Replace the fifth chip, change the installation method, heat and weld from the bottom, the quasi-voltage comes out, the sound is there, and the headphone sound is there!