Daewoo 20T1, 21Q2, 21Q1, 14T2, 21Q4, 14Q2, 20Q1 No External A/VRF OK, No ON-SCREEN Displaypicture OK

6. NO EXTERNAL A/V(RF OK)

CHECK EXTERNA AUDIO

& VIDEO SIGNAL

AT PIN2 & 17 OF I501

RESPECTIVELY

	ABNORMAL			NORMAL
CHECK RCA JACK		OK	CHECK WAVEFORM
			AT PIN7 & 8 OF I501
	ABNORMAL
CHECK / REPLACE I701		OK	CHECK / REPLACE I501

OK

7. NO ON-SCREEN DISPLAY(PICTURE OK)

CHECK HORI. & VER. SYNC

AT PIN46 & 45

OF I701 RESPECTIVELY

NORMAL

ABNORMAL

CHECK / REPLACE

OK

CHECK OSD R/G/B SIGNAL

Q301, Q302(VER. SYNC)

& BLANKING SIGNAL

D401, R414(HORI. SYNC)

AT PIN 47, 48, 49 & 50 OF I701

ABNORMAL

NORMAL

CHECK WAVEFORM

CHECK OSD IN/PUT WAVEFORM

AT PIN23, 24, 25, 26

AT PIN 38, 39 OF I701

OF I501

ABNORMAL

NORMAL

CHECK / REPLACE

OK

CHECK / REPLACE

CHECK / REPLACE

PERI. COMP

I501

I701 & PERI. COMP

OK

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