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5
=> COMP/S1
Image for the composite or S-video
signal is not displayed.
Is the function corresponding to
selected signal input selected?
Yes
Has the signal arrived at IC5101
(CVBS_SW)?
6
7
Yes
Which signal is not output,
main or sub signal?
MAIN
Is a signal output from IC5101
(CVBS_SW)? (pins 42, 45)
8
9
Yes
Has the signal arrived at IC4702
(VDEC)? (pins 22, 26)
10
11
Yes
Are the data output from IC4702
(VDEC)? (pins 93 to 97),
(pins 99 to 104), (pins 107 to 109)
Yes
Is the communication between
each IC (VDEC, ASIC) on the
MAIN BLOCK Assy and the
microcomputer normal?
Yes
Replace the MAIN BLOCK Assy.
Waveforms
Input signal: PAL Color-bar (S termial)
IC5101 - pins 87, 93 (Y)
6
7
V: 500 mV/div H: 20 μsec/div
IC4702 - pin 26 (Main C)
11
12
V: 500 mV/div H: 20 μsec/div
5
6
No
Select the corresponding signal
with the Input selector.
No
Check around the input terminals.
SUB
No
Check around IC5101 and check the communications
between IC5101 and microcomputer. If there was no
problem, replace the MAIN BLOCK Assy.
No
Check the circuits between IC5101 and IC4702.
If there was no problem, replace the MAIN BLOCK Assy.
Check around the IC4702 and check the communications
No
between IC4702 and microcomputer.
If there was no problem, replace the MAIN BLOCK Assy.
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.
IC5101 - pins 89, 95 (C)
IC5101 - pin 45 (Main Y)
8
V: 500 mV/div H: 20 μsec/div
V: 500 mV/div H: 20 μsec/div
IC5101 - pin 49 (Sub Y)
IC5101 - pin 47 (Sub C)
13
V: 500 mV/div H: 20 μsec/div
V: 500 mV/div H: 20 μsec/div
6
7
INPUT_1, 3 NG
Replace the MAIN BLOCK Assy.
INPUT_2 NG
Check the FFC (J203) between MAIN BLOCK and REAR_IO
Assys. If there was no problem, replace the REAR_IO Assy.
INPUT_5 NG
Check the FFC (J201) between MAIN BLOCK and FRONT_IO
Assys. If there was no problem, replace the FRONT_IO Assy.
Is the screen of main side Tuner?
No
Is a signal output from IC5101?
(pins 47, 49)
No
Has the signal arrived at IC4702?
(pins 69, 70)
No
Are the data output from IC4702?
(pins 79 to 86), (pins 88 to 90)
IC5101 - pin 42 (Main C)
9
V: 500 mV/div H: 20 μsec/div
IC4702 - pin 70 (Sub Y)
14
V: 500 mV/div H: 20 μsec/div
KRP-M01
7
8
No
Yes
Specifications that does not
display in the sub-side.
V
12
13
Yes
14
15
Yes
Yes
IC4702 - pin 22 (Main Y)
10
V: 500 mV/div H: 20 μsec/div
IC4702 - pin 69 (Sub C)
15
V: 500 mV/div H: 20 μsec/div
8
A
B
C
D
E
F
41

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