LG Electronics RD-JT41 manual 31

LG RD-JT40/41 Service Manual

4. Power Supply Trouble Shooting Guide

			YES	CHECK SPS B/D.
	B + B-
				WHETHER POOR
INPUT	380VDC			SOLDER
LINE
0VACOR
220VAC	NO
			B + B-		YES	CHECK PFC B/D.
			54VDC			WHETHER POOR
						SOLDER
				NO
					YES		YES			YES	CHECK IC65
			B + B-			F65		Q65	DAMAGE
											R656,D65
			0VDC			OPEN		(D.S. SHORT)			BD65 ,R658
											R678
				NO		NO			NO
		CHECK				CHECK L65				YES	CHECK
		R663,R662,				L652		Q60	DAMAGE		R6 2,R609
		R66 ,R659,				WHETHER		(D.S. SHORT)			D6 0,IC60
		R660,ZD65				POOR SOLDER					R6 ,Q602
									NO
								CHECK
								POLARITY :
								B+ PGND,
								B + B-,
								C659

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