Panasonic SA-PT750PL Service Manual page 123

Problems
2) When switching the
video output mode from
480P to 720p/1080i, TV
display becomes blank
3) Color Problem. TV
screen is White/Blue/ Purple
4) HDMI got no audio output
Checking Points
1) Supply for Up-Con
(IC3901)
- Pin 9, 124
2) GND for Up-Con
- Pin 7, 125
3) Check for capacitor short
to GND
1) Check digital video data
line from LSI (IC8001) to
Up-Converter (IC3901),
VOUT0-VOUT7.
1) Audio data lines
2) Check setting of the set
in Setup Menu whether the
HDMI Audio output is
turned ON
121
Checking Components
LB3902
C3902, C3928, C3925
RX3707, RX3708
R8402, RX8402
* Check for solder short
and/or component
missing/damaged as well as
signal condition.
SA-PT750PL