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CHAPTER 4.
LC-42AD5EB
TROUBLESHOOTING TABLE
[1] TROBLESHOOTING TABLE
Check AC input and output connector. Are they ok?
YES
Check F7001, BD7001, Z7801, L7801. Are they ok?
YES
Is there a voltage of 400V in both ends of C7800?
YES
Check voltage of Emitter (Q7902). Does it equal to 15V?
YES
Is BU5V (PA pin20 and pin21) output 5V?
Is UR5V (PA pin10-15) output 5V?
YES
Is P-CON1 (PB pin1) signal normaly?
YES
Is P-CON2 (PB pin2) signal normaly?
YES
Is UR37V (PA pin1) output 35V?
Is UR13V (PA pin4-6) output 13V?
Is S24V (PC pin1-3) output 24V?
YES
Is INV24V (LD pin1-5/LA pin1-5) output 24V?
Service Manual
Turn on AC source.
NO
Insert connectors correctly or change them.
Turn on again.
NO
Change F7001, BD7001, Z7801, L7801. Turn on again.
Does fuse open again?
Check BD7001, D7803, Q7801, Q7612, Q7602, Q7901,
IC7801, IC7604, IC7901, etc.
NO
Check IC7801, L7802, L7801, Q7801, Q7803, D7803, etc.
NO
Check IC7901, R7920, R7921, Q7901.
NO
Check IC7901, Q7901, D7951, R7950, R7951, R7961, L7951,
IC7952, etc.
NO
Check PB (pin1), Q7272, Q7240, Q7241, Q7311, etc.
NO
Check PB (pin2), Q7309, IC7304, Q7903, etc.
NO
Check C7270, C7272, D7271, D7272, Q7271, Q7270, D7274,
D7180, IC7150, L7150, D7240, Q7242, D7275, IC7241,
L7241, etc.
NO
Check IC7604, Q7612, Q7602, T7301, T7001, D7200, D7201,
R7201-3, L7200, etc.
4 – 1
LC-42AD5E/RU/S
YES
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