Sharp LC-32LE600E Service Manual page 29

<Backlight BLOCK: LC-40/46LE600E/RU/S>
Is either of fluorescence LEDs off?
Are all fluorescent LEDs on?
Is 3.3V supplied to pins(1) of CN7603(Driver_sub_PCB) when
the power switch is turned off?
Is UR13V supplied from pins(1) of connector
CN7604(Driver_sub_PCB) when the power switch is turned on?
Is the STB_ON/OFF signal supplied from pin(8) of CN7605 (LB)?
Is each control signal of CN7605 (LB) normally function?
Pin(7) OFL (PWM light control signal input)
Pin(6) ERR (Error output)
Is [LAMP_ERROR] indicated with [5] in a process mode?
Is BL_ON output to pin(2) of CN7603(Driver_sub_PCB) when
the power switch is turned on?
<40LE600E/RU/S>
Is VLED(187V) supplied to pins(1-5) of CN7606(LA1) and pins(1-
5) of CN7007(LA2) when the power switch is turned on?
<46LE600E/RU/S>
Is VLED(209V) supplied to pins(1-5) of CN7606(LA1), pins(1-5)
of CN7007(LA2), pins(1-3) of CN7608(LA3) when the power
switch is turned on?
Check if the peripheral circuits are short-circuited or parts are
faulty.
IC7508, IC7601-7607, Q7601-7613, etc ⋅ ⋅ ⋅
The backlight does not light
NO
YES
YES
YES
YES
YES
YES
YES
YES
LC-32/40/46LE600E/RU/S (1st Edition)
YES Check each fluorescent LED, and change defective parts.
(RUNTKA595WJ01, RUNTKA596WJ01, RUNTKA598WJ01
,etc.)
NO Check each fluorescent LED, and change defective parts.
(RUNTKA595WJ01, RUNTKA596WJ01, RUNTKA598WJ01
,etc.)
NO Check if the peripheral circuits are short-circuited or parts are
faulty.(U7801, U7802, etc ⋅ ⋅ ⋅)
Refer to "No power supply (Front LED does not light up)" and
"No power-up even if turned on (Front LED light up)"
NO Check if the peripheral circuits are short-circuited or parts are
faulty.
(T7102, D7507, C7514,7515,7516, PC7105, PC7106,
IC7505etc ⋅ ⋅ ⋅)
Refer to "No power supply (Front LED does not light up)" and
"No power-up even if turned on (Front LED light up)"
NO Check the STB signal line on the MAIN_UNIT side (pin(2) of
P9602(LB), pin(D23) of IC3303(VCT_P), etc...)
and the peripheral circuits.
NO Check each control circuit.
NO [LAMP_ERROR] is returned to the default value in a process
mode.
Check the peripheral circuits (IC7054, etc ⋅ ⋅ ⋅)
NO
NO <40LE600E/RU/S>
Check if the peripheral circuits are short-circuited or parts are
faulty.
T7102, D7516, D7517, C7528, L7501, D7525etc ⋅ ⋅ ⋅
NO <46LE600E/RU/S>
Check if the peripheral circuits are short-circuited or parts are
faulty.
T7103, D7516, D7517, D7518, C7528, C7538, L7501, C7525,
C7526 etc ⋅ ⋅ ⋅
Refer to "No power supply (Front LED does not light up)" and
"No power-up even if turned on (Front LED light up)"
5 – 4
YES
YES
YES