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1
A
=> RGB
Image for the RGB (SCART) input
signal is not displayed.
Is the function corresponding to
selected signal input selected?
Yes
B
Which signal is not output,
main or sub signal?
Main
Has the signal arrived at IC5501
(RGBSW)?
Yes
Is a signal output from IC5501?
(pins 41, 43 and 45)
C
16
17
Yes
Has the signal arrived at IC4702?
(pins 27, 28 and 65)
19
20
Yes
Is the communication between
each IC (VDEC, ASIC) on the
MAIN BLOCK Assy and the
microcomputer normal?
Yes
D
Replace the MAIN BLOCK Assy.
Waveforms
Input signal: PAL Color-bar (SCART RGB terminal)
IC5501 - pin 45 (G out)
16
V: 500 mV/div H: 20 μS/div
E
IC4702 - pin 65 (GY)
19
V: 500 mV/div H: 20 μS/div
F
42
1
2
No
Select the corresponding signal
with the Input selector.
Sub
Is the screen of main side Tuner?
Yes
V
Go to
.
No
Check the circuits between JA7502 and IC5501.
If there was no problem, replace the MAIN BLOCK Assy.
Check around IC5501 and check the communications
No
between IC5501 and microcomputer. If there was
no problem, replace the MAIN BLOCK Assy.
18
No
Check the circuits between IC5501 and IC4702.
If there was no problem, replace the MAIN BLOCK Assy.
21
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.
IC5501 - pin 43 (B out)
17
18
V: 500 mV/div H: 20 μS/div
IC4702 - pin 27 (BCB)
20
21
V: 500 mV/div H: 20 μS/div
2
3
No
Specifications that does not
display in the sub-side.
IC5501 - pin 41 (R out)
V: 500 mV/div H: 20 μS/div
IC4702 - pin 28 (BCR)
V: 500 mV/div H: 20 μS/div
KRP-M01
3
4
4

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