LC-32SD1EA (serv.man6). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 2

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LC-32SD1EA/RUA, LC-32ST1EA/RUA
5 – 2
Backlight failure to light up
                       
Do all the fluorescent tubes light up?
NO
Check the individual fluorescent 
tubes for light-up failure
YES
Replace any defective fluorescent
tubes with new ones.
YES
Is the power supplied to the inverter 
unit?
NO
Check the connection between
power unit and inverter unit.
YES
Is the fuse in the inverter unit circuit 
functioning?
NO
Replace the blown-out fuse on the 
inverter unit.
Turn on the power again. 
If the fuse gets blown out again, 
check the short-circuited
YES
Check drive trans and their peripheral
circuits as well as drive FET and their
peripheral circuits.
YES
Is the VCC power supplied to the
inverter control IC on the inverter 
unit?
NO
Check the circuit connected with the
VCC terminal on the inverter control
IC.
YES
Are there control signals (INV-ON, 
OFL, OSC) at CN7502 on the
inverter unit?
NO
Check pins (5), (7) and (8) of IC1710
(main PWB).
YES
Is the specified control signal inputted 
at INV-CTL-IC on the inverter unit?
NO
Check the line between CN7502 and
INV-CTL-IC.
YES
Are the DRIVE-FET at the primary 
side of DRIVE-TRANS functioning?
NO
Replace INV-CTL-IC or check its
peripheral circuits.
YES
Is the secondary circuit of DRIVE-
TRANS functioning?
NO
Replace the DRIVE-TRANS for
the fluorescent tubes, or check their
peripheral circuits.

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