Mitsubishi Electric LT-2220 Service Manual page 42

MODELS: LT-2220 / LT-2240 / LT-3020 / LT-3040 / LT-3050
2-1-1 (P*)
Is the digital video signal available at pin 14(G_7)
of IC4A1, and control signals of 3Vp-p available at
pins 27(HS : R4H6) and 28(VS : R4H5) and
31(CLK : R4H3) and 30(DE : R4H4) of IC4A1 ?
14 of IC4A1
(MSB of Green)
27 of IC4A1
(f=48KHz)
28 of IC4A1
(f=60Hz)
31 of IC4A1
(f=70MHz)
30 of IC4A1
(f=48KHz)
LCD-module or IC4A1(PWB-MAIN) are out of
order.
Problem is in IC2A3 or IC400
(and peripheral circuits). Are the
specified voltages available at the
connectors below?
CN Pin No. Voltage
Name
AD3.3V J190
D1.9V L400
YES
IC2A3 or IC400 (and peripheral circuits) are out
of order.(PWB-MAIN)
2-1-2 (P*)
H
V
YES
NO
When the shown voltage is in
problem, PWB including the power
supply circuit(and peripheral
circuits) is the following.
Voltage with
6 3.3Vdc
- 1.9Vdc
NO
3Vp-p
3Vp-p
3Vp-p
3Vp-p
3Vp-p
PWB including
problem the circuit in
problem
AD3.3V SET(SUB)
D1.9V MAIN
IC300 or IC4A0 (and
peripheral circuits) are
out of order. (PWB-
MAIN)