Daewoo 20Q2, 21Q2, 21Q1, 14T2, 21Q4, 14Q2, 20Q1, 14Q1, 21T2, 20Q3 No Soundpicture OK, Abnormal Normal

5. NO SOUND(PICTURE OK)

CHECK AUDIO SIGNAL

AT PIN15 OF I501

				ABNORMAL
			CHECK MUTE VOLTAGE
			AT PIN20 OF I701
			*MUTE : HIGH
						ABNORMAL
				NORMAL
			CHECK SIF SIGNAL		CHECK /REPLACE
			AT PIN1 OF I501		R619, C602, Q604
					D605, Q606, I701
						ABNORMAL
				NORMAL
			CHECK / REPLACE I501		CHECK SIGNAL WAVEFORM
					AT PIN6 OF I501
					[REFER TO WAVEFORM		]		ABNORMAL
						NORMAL
			CHECK AUDIO SIGNAL		CHECK / REPLACE			CHECK / REPLACE
			AT PIN3(TDA7056)		Q501, R602, R603			TUNER, SAW FILTER
	NORMAL		[AT PIN 1&9(TDA1519B)]		Q605 & PERI. COMP			Q101, Q102 & PERI. COMP
	ABNORMAL			NORMAL
CHECK / REPLACE		OK	CHECK VOLTAGE Vcc(+15Vdc)
			AT PIN2(TDA7056)
D813, C821			[AT PIN7(TDA1519B)]
	NG
CHECK POWER			CHECK AUDIO OUTPUT SIGNAL
			AT PIN6 & 8(TDA7056)
PART CIRCUITS
			[AT PIN4 & 6(TDA1519B)
						ABNORMAL
				NORMAL
			CHECK / REPLACE		CHECK / REPLACE
			SP01(TDA7056)		I601(TDA7056)
			[SP01 & SP02(TDA1519B)]		[I601(TDA1519B]

OK

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