Read Sharp LC-32P50E (serv.man9) Service Manual online
LC-26P50E
LC-32P50E
LC-37P50E
LC-32P50E
LC-37P50E
45
TROUBLE SHOOTING TABLE
(Continued)
NO
The backlight does not light.
Do all fluorescent lamps fail to light?
Check the fluorescent lamps that do not
light.
YES
Replace the fluorescent lamps that do not
light.
Replace the blown fuse(F703) or R1765
and turn on the power. If the backlight still
fails to light, check the area that has
shorted out.
YES
YES
Mainly check T7501, T7502 and their
peripheral circuits as well as Z7501and its
peripherals.
In POWER UNIT:
Check the fuse of the circuit for
INVERTER-UNIT.
Has the F703 2.0A in the POWER-UNIT
blown? Is the value for R1765 1½ correct?
YES
In the POWER-UNIT: Is approximately 380
VDC output to CN702? Check that the
RC701operates properly.
YES
NO
Check the connections of INV-PN7501and
POWER-CN702.
In the INVERTER-UNIT: Is the power
supplied between pins 1and 2 of
CONNECTOR-PN7501? (Pins 1 and 2 on
the measuring point PN7501; 380 VDC)
NO
Is each control signal sent to
CONNECTOR-CN1704 and CN1703 in
the POWER UNIT? (VCC 2(14V), OFL1,
INVáOSC)
NO
NO
Check the OFL1and INVáOSC-LINE of
CONNECTOR-P4101 in the MAIN-UNIT
and UR14V-LINE in the POWER-UNIT.
In the INVERTER-UNIT: Is each control
signal sent to PN7503? (VCC 2(14V)_
1Pin , OFL1_6Pin, INV-OSC_3Pin
RETURN_2Pin)
YES
YES
Replace the Z2501(INV-CTL)(STR-
H2013).
NO
In the INVERTER-UNIT: Is the control
signal of Z2501(INV-CTL)(STR-H2013)
output correctly? (PDRV1/V2(22)(20)Pin)
Check the photocoupler (PC 7501-22) and
the output transformer (T7503-25). Also
check the lamp connector connection.
YES
Click on the first or last page to see other LC-32P50E (serv.man9) service manuals if exist.