Sharp SGH-T519 manual Speaker Part, Yes

Flow Chart of Troubleshooting

10-1-6. Speaker Part

There is no sound from speaker

①

Is the connector			NO
				Reconnect HDC401
HDC401 O.K?
	YES		yes
Are there any signal at				Check & Replace
L405, L406?				L402, L403, HDC401
	NO		NO			NO
Are there any signal at
				R442 is high?				Check UCP201
R437, R438?
	YES					NO	②
				The voltage at
								Check & replace L404
				L404 >3.7V??
								③
					YES
								Check & replace U401
		The type of sound from the speaker
YES			is Melody, Mp3?			NO

Are there any signal

at the pin #15, 16 of UCD401?

NO NO

					Are there any signal
			at the pin #5,6,7 of UCD401?
	NO
					YES
Check UCP201
				The frequency at R433
	NO		⑤		is 13MHz?
					YES
	Check U101,
	R124, C140
					C453 = 3.3V?
	NO	⑥
					YES
	Check Q401
	NO				C445 & C446 = 1.8V?
			⑦
	Check U302				⑧
					Replace UCD401

		Are there any signal
YES	YES	at the pin #3,9 of U402?		NO
Pin #2 of UCD401
is Low?
	YES
Check UCP201			④
		NO
			Check and replace
			U402 & R427

Replace UCD401

10-13

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