MiTAC 8050D There is trouble with the sound from speaker or completely no sound

8050D N/B Maintenance

8.10 Audio Failure

There is trouble with the sound from speaker or completely no sound

Audio Failure

1.Check if speaker cables are connected properly.

2. Make sure all the drivers are installed		Board-level
		Secret
			Document
properly.		Troubl shooting
		MiTac		Check following parts and signals:
OK?				Parts:		Signals:
	Confidential			J705		14M_CODEC
Test	Yes			U18	D715	ROUT+
		Correct it.		U17	Q711	ROUT-
				U524	Q713	SBSPKR
No				U726	Q23	CARDSPK#
				U715	D17	PC_BEEP
				U712	D19	AVDD
				U19	D22	ACRST#
Try another known good speaker,		Replace		U725	U18	ACSDOUT
CD-ROM.				J3		ACSDIN0
		Motherboard		J7		ACBITCLK
				J719		MIC_VREF
				L741		2464_VREF
Re-test	Yes	Replace the
OK?		faulty parts.

No

AMP_LEFT

AMP_RIGHT

SUB_LEFT

SUB_RIGHT

AMP_SHUTDOWN ROUT+

ROUT-

LOUT+

LOUT-

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