Troubleshooting Table - Sharp TU-GD10U-T Service Manual

TU-GD10U-T
TU-45GAD/T
LC-45GX6U/D/T
TROUBLE SHOOTING TABLE (TU-GD10U-T, TU-45GAD/T)
Is power cable properly connected to the main unit?
Is F701 normal?
Is F702 normal?
Is BU+5V line (Pin(5) of P1701) normal?
Reconnect the wire harness, FFC, etc. in the set, and repeat
the check.
Are MDR (gray) and DVI (white) connectors of the system
cable properly connected to the Display and the AVC system?
Is the power switch of the Display ON?
Is specified voltage available at S-Vcc+15V (pins (11) and
(12) of PA/P1752), UR+10V (pin (5) of PA/P1752) and
BS+10V (pins (7) and (8) of DP/P1781)?
Is specified voltage available at D+1.8VCV (pin (6) of
PB/P1701), D+3.3V (pins (8) and (9) of PF/P1701), D+5V
(pin (12) of DP/P1701) and UR+6V (pin (7) and pin (8) of
PF/P1702)?
YES
Is D_POW line normal? Are the pins
(4) of IC1701, IC1702, IC1703 and
IC1704 at "HI", and the pin (5) of
IC952 at "LOW"?
Check D_POW line (pin (3) of
PF/P1701).
Does OVP line pin (11) of PF/P1701
voltage fluctuate immediately after
the power is supplied?
NO
Reconnect the wire harness, FFC,
etc. in the set, and repeat the check.
No power supply (Front LED is not ON)
NO
YES
NO
YES
NO
YES
NO
YES
No power-up (Front LED does not change from red to blue)
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Connect the power cable properly, and turn on the power.
Replace F701, and turn on the power. If the fuse is still
blown, replace VZ701, D701, Q705 and Q706, and repeat
the check.
Replace F702, and turn on the power. If the fuse is still
blown, replace D704 and IC701, and repeat the check.
Is there any faulty part or short-circuit in BU+5V line?
YES
Remove the faulty part or short-circuit, and repeat the check.
Reconnect properly and turn on the power.
Set the power switch of the Display to ON, and turn on the
power.
Are PS_ON (pin (1) of PF/P1701) and EU_D_POWER (pin
(2) of PG/P1702) at "HI" (3V or higher)?
YES
Check PS_ON or EU_D_POWER line.
Is specified impedance available in S-Vcc+15V, UR+10V and
BS+10V lines? (Measure the resistance between each +B
line and GND.)
YES
Check the circuits in the faulty line.
Are MOS-FET (Q1701, Q1702, Q1703, Q1704 and Q1705)
and IC952 normal?
YES
Replace IC1701.
38
NO
Check IC902 and its peripheral
circuits.
NO
NO
NO
Replace faulty FET or IC.