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1
A
[4] VIDEO SYSTEM
Flowchart of Failure Analysis for The Video System
=> ATV
Analog tuner signal is not
displayed on the screen.
Is the input selector set to TV?
B
(Analog)
Yes
Is a signal input to IC5101
(CVBS_SW)?
(pin 57)
Yes
Is a HS signal input to IC6811
(IFUCOM)?
(pin 3)
Yes
C
Which signal is not output,
main or sub signal?
MAIN
Is a signal output from IC5101
(CVBS_SW)? (pin 45)
Yes
Has the signal arrived at IC4702
(VDEC)? (pin 22)
D
Yes
Are the data output from IC4702
(VDEC)? (pins 93 to 97, 99 to 104,
107 to 109)
Yes
Is the communication between
each IC (VDEC, ASIC) on the
MAIN BLOCK Assy and the
microcomputer normal?
Yes
E
An abnormality occurs in the ASIC
ARIA or its peripheral circuits.
Replace the MAIN BLOCK Assy.
Waveforms
Input signal: PAL Color-bar (Analog tuner)
IC5101 - pin 57 (in)
1
V: 500 mV/div H: 10 μsec/div
F
40
1
2
No
Set the Input selector to TV.
(Analog)
No
Has the signal arrived at emitter
of Q5304?
1
Yes
Check around the Q5304.
Replace the Q5304, then check again.
No
Has the signal arrived at pin 6 of
Q5307?
2
Yes
Check around the Q5307 (Sync separation).
Repair the failure points, then check again.
SUB
No
Check around IC5101 and check the communications
between IC5101 and microcomputer. If there was no
3
problem, replace the MAIN BLOCK Assy.
No
Check the circuits between IC5101 and IC4702.
If there was no problem, replace the MAIN BLOCK Assy.
4
Check around IC4702 and check the communications
No
between IC4702 and microcomputer. If there was no
problem, replace the MAIN BLOCK Assy.
5
Check around the IC that is found to have failure in
No
communication and the microcomputer. If there was
no problem, replace the MAIN BLOCK Assy.
IC6811 - pin 3
2
3
V: 1 V/div H: 10 μsec/div
2
3
No
Replace the U5301 (TUNER).
No
Replace the U5301 (TUNER).
No
Is a signal output from IC5101?
(pin 49)
No
Has the signal arrived at IC4702?
(pin 70)
No
Are the data output from IC4702?
(pins 79 to 86, 88 to 90)
IC5101 - pins 45, 49 (out)
IC4702 - pins 22, 70
4
V: 500 mV/div H: 10 μsec/div
V: 500 mV/div H: 10 μsec/div
KRP-M01
3
4
3
Yes
4
Yes
5
Yes
IC4702 - pins 93, 79 (656 out)
5
V: 1 V/div H: 2 μsec/div
4

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