PDP-5050SX
143
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Image for the composite or S signal is not displayed
Image for the composite or
S signal is not displayed
No
Is the function corresponding
to selected signal input
selected?
No Select the corresponding
signal with the Input selector.
Has the signal arrived at
IC8002?
Check the communication
between the jack and
IC8002.
Yes
Which signal is not output,
main or subsignal?
Yes
No
Is a signal output from
IC8002?
(44) (47)
Check around IC8002 and
check the communications
between IC8002 and the
microcomputer.
Main signal
Is a signal output from
IC8002?
(56) (58)
Has the signal arrived at
IC6255?
(52) (59)
No
Subsignal
No
Has the signal arrived at
IC6107?
(52) (59)
Check the communications
between IC8002 and
IC6107.
Yes
Yes
No
Check the communications
between IC8002 and
IC6255.
• For check the communication with the microcomputer,
refer to the section 6.5 SERVICE FACTORY MODE.
• The encircled numbers denote measuring point in the
Waveforms for Troubleshooting.
• Diagnosis points
Note:
No
Is the communication
between each IC on the
MAIN BOARD Assy and
the microcomputer normal?
Check around the IC that is
found to have a failure in
communication and the
microcomputer.
Yes
No
Has the symptom been
settled when the MAIN
BOARD Assy is replaced?
The panel is defective.
Yes
No
Finishing troubleshooting
Yes
TV signal is not displayed
on the screen.
Yes
Is the Input selector set to
TV?
No
Set the Input selector to TV.
Is a signal output normally
from the FE
(U7501)? (18)
Check around the FE and
check the communications
between the FE and the
microcomputer.
Yes
No
Yes
Has the signal arrived at
IC8002?
(63)
Check the communications
between U7501 and
IC8002.
Yes
Yes
MAIN BOARD ASSY
AV BOARD ASSY
No
2
6
5
10
9
4
3
8
7
1
If no picture is displayed, press the POWER button to turn the power off then back on after a while.
When the red LED is flashing, the power has been Power down. Check how many times the LED is flashing.
(See the Power-down diagnosis on page 134.)
When the green LED is lit, follow the procedures below:
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