LC-40LU700E (serv.man9). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 4

LC-32/40/46LE700E/RU/S,LU700E/S,LX700E/RU,LC-52LE700E/RU/S

6 – 4

                                            
Does a part of the LED lamp shine?

YES

Check each LED lamp, and replace if defective.
RUNTKA595WJ01/02, RUNTKA596WJ01/02, 
RUNTKA598WJ01/02

NO

Is 3.3V supplied to pins(1) of CN7603 when the power switch is 
turned off? 

NO

Check if the peripheral circuits are short-circuited or parts are 
faulty.(IC7506, 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) of connector CN7604 when the 
power switch is turned on? 

NO

Check if the peripheral circuits are short-circuited or parts are 
faulty.
 (T7102, D7507, C7514,7515,7516, PC7105, PC7106, 
IC7505etc 

⋅ ⋅ ⋅) 

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 CN7605? 

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 CN7605 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 pins(2) of CN7603 when the power 
switch is turned on? 

NO

Check the peripheral circuits (IC7054, 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? 

NO

<40 inch models>
Check if the peripheral circuits are short-circuited or parts are 
faulty.
T7102, D7516, D7517, C7528, L7501, D7525etc 

⋅ ⋅ ⋅ 

<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? 

NO

<46/52 inch models>
Check if the peripheral circuits are short-circuited or parts are 
faulty.
T7102, D7516, D7517, D7518, C7528, C7538, L7501, D7518, 
C7525, C7526 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.
IC7508, IC7601-7607, Q7601-7613, etc 

⋅ ⋅ ⋅