Read Sharp LC-40LU700E (serv.man9) Service Manual online
LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
6 – 2
<POWER BLOCK: 40/46/52 inch models>
No power supply (Front LED does not light up) and no power-up even if turned on (Front LED light up).
Is the wire harness in the unit properly connected?
NO
Reconnect and recheck the wire harness.
YES
Are F7001 and F7002 normal?
NO
<40 inch models>
Are L7001, L7002, L7003, D7101, D7103, VA7002, VA7001,
VA7003 etc... faulty?
Check if the peripheral circuits are short-circuited.
Are L7001, L7002, L7003, D7101, D7103, VA7002, VA7001,
VA7003 etc... faulty?
Check if the peripheral circuits are short-circuited.
YES
<46 inch models>
Are L7001, L7002, L7003, L7004, D7101, VA7002, VA7001,
VA7003 etc... faulty?
Check if the peripheral circuits are short-circuited.
Are L7001, L7002, L7003, L7004, D7101, VA7002, VA7001,
VA7003 etc... faulty?
Check if the peripheral circuits are short-circuited.
Is F7102 normal?
NO
Are TH7102, C7130, etc... faulty?
YES
Is BU+5V supplied from pin(11) of connector CN7501 when the
power switch is turned off?
power switch is turned off?
NO
Check the peripheral circuits (IC7102, T7101, C7510, PC7102,
PC7101, etc
PC7101, etc
⋅ ⋅ ⋅)
YES
Is the PS_ON signal sent to pin(10) of connector CN7501 when
the power switch is turned on?
the power switch is turned on?
NO
Check pin(59) of IC2002(UCON) on MAIN PWB.
YES
Is the AC_DET signal sent to pin(9) of connector CN7501 when
the power switch is turned on?
the power switch is turned on?
NO
Check the peripheral circuits such as PS_ON circuits of Q7503,
PC7103, Q7118, Q7114 and PC7104,Q7501,Q7502.
PC7103, Q7118, Q7114 and PC7104,Q7501,Q7502.
YES
Is a DC voltage of approx. 400V applied to both ends of C7144?
NO
<40 inch models>
Does the PFC circuit normally work?
(Check IC7104, L7105, TH7101, RL7101, IC7200, Q7109,
Q7110 etc... and the peripheral circuits.)
Does the PFC circuit normally work?
(Check IC7104, L7105, TH7101, RL7101, IC7200, Q7109,
Q7110 etc... and the peripheral circuits.)
YES
<46/52 inch models>
Does the PFC circuit normally work?
(Check IC7104, L7105, TH7101, RL7101, IC7101, Q7108,
Q7109 etc... and the peripheral circuits.)
Does the PFC circuit normally work?
(Check IC7104, L7105, TH7101, RL7101, IC7101, Q7108,
Q7109 etc... and the peripheral circuits.)
Is UR13V supplied from pins(1-4) of connector CN7501 when the
power switch is turned on?
power switch is turned on?
NO
Check the peripheral circuits (T7102, D7507, C7514,7515,7516,
PC7105, PC7106, IC7503etc...)
PC7105, PC7106, IC7503etc...)
YES
Is PNL12V supplied from pins(1-2) of connector CN7503 when
the power switch is turned on?
the power switch is turned on?
NO
Check the peripheral circuits (IC7502, etc
⋅ ⋅ ⋅)
YES
<40 inch models>
Is VLED supplied to pins(1-5) of CN7606 and pins(1-5) of
CN7607 when the power switch is turned on?
Is VLED supplied to pins(1-5) of CN7606 and pins(1-5) of
CN7607 when the power switch is turned on?
NO
<40 inch models>
Check the peripheral circuits, T7102, D7516, D7517, C7528,
L7501etc
Check the peripheral circuits, T7102, D7516, D7517, C7528,
L7501etc
⋅ ⋅ ⋅.
<46/52 inch models>
Is VLED supplied to pins(1-5) of CN7606, pins(1-5) of
CN7607,pins(1-3) of CN7608 when the power switch is turned
on?
Is VLED supplied to pins(1-5) of CN7606, pins(1-5) of
CN7607,pins(1-3) of CN7608 when the power switch is turned
on?
NO
<46/52 inch models>
Check the peripheral circuits, T7102, D7516, D7517, D7518,
C7528, C7538, L7501etc
Check the peripheral circuits, T7102, D7516, D7517, D7518,
C7528, C7538, L7501etc
⋅ ⋅ ⋅.
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