Sharp Aquos LC-32LE700S, Service Manual

Page: 48 / 164

LC
-
32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S
6 – 3
<Backlight BLOCK: 32 inch models>
The backlight does not light
Does a part of the LED lamp shine?
YES Check each LED lamp, and replace if defective.
RUNTKA595WJ01/02, RUNTKA598WJ01/02
NO
Is REG3.3V supplied to pin of IC7054 when the power switch is
turned on? NO Check if the peripheral circuits are short-circuited or parts are
faulty. (U7401, 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)"
Is UR13V supplied from pins(1-4) of connector CN7003 when the
power switch is turned on? NO Check the peripheral circuits
(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)"
Is the STB_ON/OFF signal supplied from pin(8) of CN7008? NO Check the STB signal line on the MAIN_UNIT side (P9602,
pin(49) of IC2002,IC2007,AH3 of IC3302, etc
⋅ ⋅ ⋅
)
and the peripheral circuits.
YES
Is each control signal of CN7008 normally function?
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.
YES
Is BL_ON supplied from pin of IC7054 when the power switch is
turned on? NO Check the peripheral circuits (IC7054, etc
⋅ ⋅ ⋅
)
YES
Is 144V supplied to pins(2,4,6) of CN7007 and
pins(2,4,6,8,10,12) of CN7006 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
⋅ ⋅ ⋅
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)"
Check if the peripheral circuits are short-circuited or parts are
faulty.
U7651, U7502, U7601-7605, Q7501-7509, Q7601-7609