Panasonic SCXH70 Service Manual page 39

Problems
1) TV does not have any
display. Set FL display
shows U702/U703
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
13) Hot-Plug Signal
14) TDMS Output swing amplitude
control resistor
15) Host Interface External Input
Clock from LSI (IC8001) to
Up-Con IC (IC3901) - OSC27M
16) Video Data Lines from LSI
(IC8001) to Up-Con (IC3901)
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
39
Checking components
LB3906, R3902, R3903, Q3901,
D3901
R3901
LB8702
RX3707, RX3708, IC3901
(Pin 92 to 95, Pin 87 to 90)
LB3902
C3902, C3928, C3925
RX3707, RX3708
R8402, RX8402
* Check for solder short and/or
component missing/damaged
as well as signal condition.