LC-30AD1E (serv.man8). troubleshooting table - Sharp TV Service Manual (repair manual). Page 3

Noise is caused to the moving picture when 
the QS drive is set to ON.

Is OSTEMP.AD on the 3rd page of the 
process adjustment mode set to 255?

Is the harness connected correctly 
between the Power PWB and Inverter 
PWB?

Is the input voltage on pin (2) of 
IC2004 (microprocessor) 5V?

TH2001 thermistor 
is faulty.

Check IC4701 and 
IC4901 and the peripheral 
circuitry.

Connect the harness 
correctly or replace it.

Pin (2) of IC2004 
(microprocessor) is faulty.

Check the connection of the high-voltage 
(pin (2)) wire on the side of the blown 
fuse and check that of the counterpart 
high-voltage (pin (2)) wire of the 
fluorescent lamp on the opposite side.

The backlight does not go on.

Is any of the fuses of 
F6551-F6556 
blown?

Is the control signal applied to 
pin (8) (OFL1) and pin (9) 
(OFL2) of P6564?

Is the cord connected correctly 
between the LCD Control PWB and 
Inverter PWB and Power PWB?

Check the peripheral circuitry of 
IC4501 of the LCD Control PWB 
and check the operation of 
Q7701 and Q7702.

Is power supplied to 
Inverter PWB?

Check the Lamp error detection circuit on the Inverter-GND 
PWB.

Check the 15V output on the 
Power PWB.

Check the inverter 
circuit downstream 
from the blown fuse.