Panasonic VL-SV74BX, Service Manual

Page: 31 / 99

Is the voltage of
CL230(Main Board) about
3.3V for LCD?
Check around Q230,
R230,R231,
of Main Board.
Replace the LCD unit.
Replace the Main Board.
END
NO
YES
NO
(from previous page)
Is the unit powered
ON ?
NO
YES
END
Replace the
fault parts.
Is the voltage of
CL233(Main Board) about
-6.8V for LCD?
Check around C239,D231,
C236,R235,Q231,D230,
R232,C232 and C231
of Main Board.
NO
YES
Is the unit powered
ON ?
NO
YES
END
Replace the
fault parts.
Is the voltage of
CL232(Main Board) about
15.3V for LCD?
Check around C240,D233,
R249,Q232,R241,C247,
C248,Q233,R246,Q234
and R243 of Main Board.
NO
YES
Is the unit powered
ON ?
NO
YES
END
Replace the
fault parts.
Is the voltage of
CL231(Main Board) about
10.4V for LCD?
Check around L230,
IC230,R256,C238,D232,
R237,R238,C241,C243
and C245 of Main Board.
NO
YES
Is the unit powered
ON ?
NO
YES
END
Replace the
fault parts.
Is the unit powered
ON ?
YES
END
Reference:
• Refer to LCD start up in [9.3 Signal Route] .
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