Sharp Aquos LC-45GD1E, Service Manual, Page: 49 / 281

49
TU-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE (TU-45GD1E)
No power supply (Front LED is not ON)
Is power cable properly connected to the main unit?
Is F701 normal?
Is F702 normal?
Reconnect the wire harness, FFC, etc. in the set, and repeat
the check.
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, D708, 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.
Remove the faulty part or short-circuit, and repeat the check.
Check IC902 and its peripheral
NO
NO
NO
Is there any faulty part or short-circuit in BU+5V line?
NO
NO
YES
YES
Is BU+5V line (PI/CN901) normal?
YES
YES
YES
No power-up (Front LED does not change from red to blue)
Are MDR (gray) and DVI (white) connectors of the system
cable properly connected to the Display and the AVC system?
Reconnect properly and turn on the power.
NO
Is the power switch of the Display ON?
Set the power switch of the Display to ON, and turn on the
power.
YES
NO
In the DC/DC-CONV-UNIT: Is specified voltage available at
S-Vcc+15V (pins (11) and (12) of P1752), UR+10V (pin (5) of
P1752) and CPU+10V (pins (7) and 8) of P1781)?
In the DC/DC-CONV-UNIT: Is specified voltage available at
D+1.8V (pin (6) of P1701), D+3.3V (pins (8) and (9) of
P1701), D+5V (pin (12) of P1701) and UR+6V (pins (6) and
(7) of P1702)?
Reconnect the wire harness, FFC,
etc. in the set, and repeat the check.
Are PS_ON (pin (1) of P1701) and EU_D_POWER (pin (2) of
P1702) at "H" (3V or higher)?
In the DC/DC-CONV-UNIT: Are REG-IC
(IC1701/02/03/04/05/06/07 and IC951) and IC952 normal?
Does the OVP line (pin (11) of
P1701) voltage fluctuate
immediately after the power is
supplied?
In DC/DC-CONV Unit:Is specified impedance available in S-
Vcc+15V, UR+10V, CPU+10V and BS+10V lines? (Measure
the resistance between each +B line and GND.)
Check PS_ON or EU_D_POWER line.
Check the circuits in the faulty line.
Check D_POW line (pin (3) of
P1701).
Is D_POW line (pin (3) of P1701)
normal? Is the pin (4) of
IC1701/2/3/4/5 at "Hi" and the pin (5)
of IC952 at "LOW"?
YES
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
NO
YES
Replace abnormal IC.