LG 563N, CB563G-NA TROUBLESHOOTING GUIDE

TROUBLESHOOTING GUIDE

1. NO POWER

	NO POWER
	(POWER INDICATOR OFF)
	CHECK		NO	TROUBLE IN FUSE
	FUSE OK?
				(F901)
	(F901)
		YES
	CHECK
	C908 VOLTAGE?		NO	TROUBLE IN D900
	(AC120V: 160VDC,
	AC220V: 304VDC)
		YES
	CHECK
	IC901 PIN 6		NO	TROUBLE IN
	WAVEFORM
	(SQUARE WAVE			IC901
	COMES OUT?)
		YES
	CHECK		NO	TROUBLE IN
	D941, D942, D951,
				D941, D942, D951,
	D961, D962, D971
				D961, D962, D971
	VOLTAGE?
		YES
	TROUBLE IN
	Q903,	Q952,
	Q951, Q942, Q941
			- 11 -

2. NO CHARACTER

	NO CHARACTER
	CHECK	NO	TROUBLE IN
	IC302
			P302 5V LINE
	PIN 9 (5V) ?
	YES
	CHECK	NO	TROUBLE IN
			PC SIGNAL,
	IC302 PIN 5, 6, 7 ?
			P301 SIGNAL CABLE
	YES
	CHECK	NO	TROUBLE IN
	IC302 PIN 18, 19, 20 ?		IC302
	YES
	CHECK	NO	TROUBLE IN
	IC303 PIN 4 (80V)
			P303 12V LINE/
	PIN 8 (12V) ?
			80V LINE
	YES
	CHECK	NO
	IC303		TROUBLE IN IC303
	PIN 1, 2, 3 ?
	YES
	CHECK	NO	TROUBLE IN
			R331~R333,
	R, G, B CATHODE
			L311~L313
	VOLTAGE?
			D307~D312
	YES
	TROUBLE IN
	CRT SOCKET
		- 12 -

3. NO RASTER

	NO VIDEO
	(POWER INDICATOR ON)
	CHECK	ORANGE	DPM MODE
	POWER INDICATOR
	GREEN or ORANGE?		(NO H and/or V SYNC)
	GREEN
	CHECK	NO	TROUBLE IN
	D712 ANODE
			D712
	(-157V)?
	YES
	CHECK	NO	TROUBLE IN
	G1 VOLTAGE?		Q799
	(-55 ~ -15V)
	YES
	CHECK	NO	TROUBLE IN
	CDT HEAT
			D941, Q942, Q941
	VOLTAGE? (6.3V)
	YES
	TROUBLE IN
	CDT
		- 13 -