Panasonic SA-PT875GA, Service Manual

Page: 52 / 165

52
Problems Checking Points Checking components
13) Hot-Plug Signal
14) TDMS Output swing amplitude
control resistor
LB3906, R3902, R3903, Q3901,
D3901
R3901
15) Host Interface External Input
Clock from LSI (IC8001) to
Up-Con IC (IC3901) - OSC27M LB8702
16) Video Data Lines from LSI
(IC8001) to Up-Con (IC3901) RX3707, RX3708, IC3901
(Pin 92 to 95, Pin 87 to 90)
1) Supply for Up-Con (IC3901)
- Pin 9,124
2) GND for Up-Con
- Pin 7,125
3) Check for capacitor short to
GND LB3902
1) Check digital video data line
from LSI(IC8001) to Up-Converter
(IC3901), VOUT0-VOUT7. RX3707, RX3708
C3902, C3928, C3925
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
1) Audio data lines
2) Check setting of the set in
Setup Menu whether the HDMI
Audio output is turned On
R8402, RX8402
* Check for solder short and/or
component missing/damaged
as well as signal condition.
4) HDMI got no audio output