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LG RD-JT40/41 Service Manual
31
4. Power Supply Trouble Shooting Guide
LINE
INPUT
0VACOR
220VAC
B + B-
380VDC
YES CHECK SPS B/D.
WHETHER POOR
SOLDER
NO
B + B-
54VDC
CHECK PFC B/D.
WHETHER POOR
SOLDER
NO
B + B-
0VDC
F65
OPEN
Q65 DAMAGE
(D.S. SHORT)
YES
NO
CHECK
R6 2,R609
D6 0,IC60
R6 ,Q602
CHECK IC65
R656,D65
BD65 ,R658
R678
NO
YES
CHECK L65
L652
WHETHER
POOR SOLDER
Q60 DAMAGE
(D.S. SHORT)
YES
NO
CHECK
POLARITY :
B+ PGND,
B + B-,
C659
YES
YES
NO
CHECK
R663,R662,
R66 ,R659,
R660,ZD65