Sharp AQUOS LC-37HV4E, Руководство по обслуживанию

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24
LC-37HV4E
Noise appears on the moving image when the QS drive is turned ON.
Is OSTEMP.AD on the 3rd page
of the process adjustment
mode set to 255?
Are the audio unit and the
inverter 4 unit connected
properly by the harness?
YES
Are the inverter 3 unit and the
inverter 4 unit connected
properly by the board-to-board?
YES
NO
Check IC4701, IC4901 and
the circuits around them.
NO
Check IC4701, IC4901 and
the circuits around them.
NO
Connect securely or replace
the board-to-board.
Are the main unit and the
inverter 3 unit connected
properly by the harness?
YES
NO
Connect properly or replace
the harness.
Is the input voltage at pin (2) of
IC2004 (micro-processor) 5V?
YES
Failure of thermistor of TH3801.
YES
NO
Failure of pin (2) of IC2004
(micro-processor).
The backlight does not light up.
Is any of the fuses of
F7501- F7504, F7551-
F7553, F7611-F7614 and
F7641-F7643 burned out?
Check the inverter circuit
downstream from the
burned-out fuse.
YES
YES
NO
Is a control signal
appearing at pin (2)
(OFL1) and pin (3) (OFL2)
of P7506 and P7616?
Is power supplied to each
unit?
Check the opposite
inverter circuit of the pair.
Check the wire connected between the inverter 1 and 3 units, the board-
to-board between the inverter 1 and 2 units and the board-to-board
between the inverter 3 and 4 units.
Check for 15V output in the power
unit.
Check the connection of the
high-voltage (pin 2) wire on the
side of the burned-out fuse and
check the connection of the high-
voltage (pin 2) wire of the
opposite fluorescent lamp of the
pair.
NO
NO
Are the main unit and the inverter
1 and 3 units connected properly
by the harness.
YES
YES
Check the circuits around IC4501
in the main unit and check the
operation of Q7704 and Q7705.
TROUBLE SHOOTING TABLE (Continued)