Daewoo DV-K580NZ-T service manual PB-C Signal N.G

TROUBLESHOOTING FLOW CHART

D. PB-C SIGNAL N.G.

Is color signal output		NO
from pin7 of IC 401?
	YES
		NO
Is color signal input into
pin 15 of IC 301?
	YES

Is +5V supplied at		NO
pin 1, 2 of IC 401?.
	YES
Check Q409,
Q414, Q415.

Check power circuit.

Clean head or change head.

Is color signal output from		NO	Is C-ROTARY input into		NO
pin 27 of IC 301?			pin 41 of IC 301?
	YES			YES

Check pin 15 of IC 601.

Change IC 301.

Is color signal input into		NO
pin 25 of IC 301?
	YES
		NO
Check oscillation of
pin 18, 19 of IC 301.
	YES
		NO
Is composite video signal
output from pin 3 of IC 301?
	YES
		NO
Is V composite signal input
into pin 4 of IC 301?
	YES

Is composite V-signal output NO from pin 34 of IC 301?

YES

TERMINAL OUT.

Is 5V supplied at		NO
pin 28 of IC 301?
	YES
Check X 301.
Check pin 35 Vcc of IC 301.
		YES
Is signal output from
pin 8 of IC 303?
	NO
		NO
Is signal input
into pin 4 of X301?
	YES
Is signal output		NO
into pin 1 of X303?
	YES
		NO
Is signal input
into pin 6 of IC 303?
	YES
		NO
Is B/W(H) signal input
into pin 4 of IC 303?
	YES
Change IC 301.
Change IC 301.

Check power.

Check X 302.

Check Q303.

Check PATTERN.

Check X303.

Check Q370, 371, 372, 373, 374, 375, 378.

Check pin100 of IC 601.

37