Sharp K7203 Rev A Troubleshooting Guide
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K7203 (REV. A) TROUBLESHOOTING GUIDE
SYMPTOM CAUSE COMMENTS
NO VIDEO D305, D103, IC1, C802, CRT
Q801, Q802, C508
DISTORTED VIDEO C403, C305, C307, IC301
INTERMITTENT VIDEO R101, C011, Q002
DEAD/NO POWER R101, Q002, D001, Q11, D312, T103
C802, D104, D503, C600, C601, T601
Q002, Q503, D312, T601, T501 BLOWS FUSE
SHUTS DOWN C101, Q002, D001, C012, R101, C117 C101 SHOULD BE 105 DEG. TEMP RATE
C102, U101, Q501, C511, VR001, T601
Q203, C011, U101, Q002 INTERMITTENT SHUTDOWN
BRIGHTNESS C319, C320, Q307, D305, VR102, IC U301
CONTRAST C316, Q306, D311, VR101, U301
NO VERT DEFLECTION R403, Q304, U401
SYNC PROBLEM Q309, C515, D307, C504, 506, IC U501 CHECK THAT SYNC IS GOING INTO
R510, VR501, PROPER IN PUT (+or -) SEP. SYNC
HORIZ LINE TOP C413 OR (+or-) COMP. SYNC
COLOR PROBLEMS U301, C807, Q801, Q803, Q805 RETRACE LINES C402
NO RED Q801, Q802, Q301, IC U301, CRT
PICTURE RED Q801, Q802, IC U301, CRT BLUE & GREEN MAY BE MISSING
NO BLUE Q805, Q806, Q303, IC U301, CRT
PICTURE BLUE Q805, Q806, IC U301, CRT RED & GREEN MAY BE MISSING
NO GREEN Q803, Q804, Q302, IC U301, CRT
PICTURE GREEN Q803, Q804, IC U301, CRT, C104 RED & BLUE MAY BE MISSING
WIDTH PROBLEM C600, D602, VR105, T601
PIN CUSHION C611, Q601, Q602, C612 ADJUST VR601 & VR602 IN CONJUNCTION
NOTE: ITEMS IN THE CAUSE COLUMN ARE LISTED FROM MOST COMMON
TO LEAST COMMON COMPONENTS
C.HEDRICK