Read Sharp LC-32LE600E (serv.man7) Service Manual online
LC-32/40/46LE600E/RU/S
5 – 3
<Backlight BLOCK: LC-32LE600E/RU/S>
The backlight does not light
Is either of fluorescence LEDs off?
YES
Check each fluorescent LED, and change defective parts.
(RUNTKA595WJ01, RUNTKA598WJ01,etc.)
(RUNTKA595WJ01, RUNTKA598WJ01,etc.)
NO
Are all fluorescent LEDs on?
NO
Check each fluorescent LED, and change defective parts.
(RUNTKA595WJ01, RUNTKA598WJ01,etc.)
(RUNTKA595WJ01, RUNTKA598WJ01,etc.)
YES
Is REG3.3V supplied to pin(1) of CN7603(Driver_sub_PCB)
when the power switch is turned on?
when the power switch is turned on?
NO
Check if the peripheral circuits are short-circuited or parts are
faulty. (U7701, U7702, etc
faulty. (U7701, U7702, etc
⋅ ⋅ ⋅)
YES
YES
Refer to "No power supply (Front LED does not light up)" and
"No power-up even if turned on (Front LED light up)"
"No power-up even if turned on (Front LED light up)"
Is UR13V supplied from pins(1-4) of connector CN7003 (PD)
when the power switch is turned on?
when the power switch is turned on?
NO
Check the peripheral circuits
(T7002, D7501, L7501, PC7001)
(T7002, D7501, L7501, PC7001)
YES
YES
Refer to "No power supply (Front LED does not light up)" and
"No power-up even if turned on (Front LED light up)"
"No power-up even if turned on (Front LED light up)"
Is the STB_ON/OFF signal supplied from pin(8) of CN7008 (LB)?
NO
Check the STB signal line on the MAIN_UNIT side (pin(2) of
P7602(LB), pin(D23) of IC3303(VCT_P), etc...)
and the peripheral circuits.
P7602(LB), pin(D23) of IC3303(VCT_P), etc...)
and the peripheral circuits.
YES
Is each control signal of CN7008(LB) normally function?
Pin(7) OFL (PWM light control signal input)
Pin(6) ERR (Error output)
Pin(7) OFL (PWM light control signal input)
Pin(6) ERR (Error output)
NO
Check each control circuit.
YES
Is [LAMP_ERROR] indicated with [5] in a process mode?
NO
[LAMP_ERROR] is returned to the default value in a process
mode.
mode.
YES
Is BL_ON output to pin(2) of CN7603 when the power switch is
turned on?
turned on?
NO
Check the peripheral circuits (IC7054, etc
⋅ ⋅ ⋅)
YES
Is 144V supplied to pins(2,4,6) of CN7007(LA2) and
pins(2,4,6,8,10,12) of CN7006(LA1) when the power switch is
turned on?
pins(2,4,6,8,10,12) of CN7006(LA1) when the power switch is
turned on?
NO
Check if the peripheral circuits are short-circuited or parts are
faulty.
IC7251,PC7004, PC7006, T7501, D7501, C7501, FA5511,etc
faulty.
IC7251,PC7004, PC7006, T7501, D7501, C7501, FA5511,etc
⋅ ⋅ ⋅
YES
YES
Refer to "No power supply (Front LED does not light up)" and
"No power-up even if turned on (Front LED light up)"
"No power-up even if turned on (Front LED light up)"
Check if the peripheral circuits are short-circuited or parts are
faulty.
U7651, U7502, U7601-7605, Q7501-7509, Q7601-7609
faulty.
U7651, U7502, U7601-7605, Q7501-7509, Q7601-7609
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