GENERAL INFORMATION
DIAGNOSIS
TROUBLESHOOTING
Image for the composite or S or TV 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.
Is the Component Signal is
connect to jack?
(Input 1, Input 4)
Disconnect Component and
cofirm again.
Yes
Which signal is not output,
main or sub signal?
Yes
No
Is the HDMI Input is set to
disable? (Input 1)
No Set the HDMI Input set to
disable and confirm again.
Has the signal arrived
at IC4801?
Check the contact between
the jack and IC4801.
Yes
Yes
No
Is a signal output from
IC4801?
(pin 47) (pin 49)
Check around IC4801 and
check the communications
between IC4801 and the
microcomputer.
Main signal
Is a signal output from
IC4801?
(pin 42) (pin 45)
Has the signal arrived at
IC6601?
(pin 1) (pin 2)
No
Sub signal
No
Has the signal arrived at
IC6003?
(pin 148) (pin 158)
Check the communications
between IC4804 and IC6003.
Yes
Yes
No
Check the communications
between IC4801 and IC6601.
• For check the communication with the microcomputer,
refer to the section 6.3 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 MR
MAIN 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 MR MAIN
Assy is replaced?
The panel is defective.
Yes
No
Finishing troubleshooting
Yes
TV signal is not displayed
on the screen.
No
Is the Input selector set to
TV?
No
Set the Input selector to TV.
Yes
Is a signal output normally
from the FE to IC4801?
(pin 57)
Check around the FE and
check the communications
between FE and IC4801 and
the microcomputer.
Yes
Yes
MR MAIN ASSY
No
41