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5
=> COMP/PC1
Image for the component signal
is not displayed.
Is the function corresponding to
selected signal input selected?
Yes
Which signal is not output,
main or sub signal?
MAIN
Has the signal arrived at IC5501
(RGBSW)? (pins 86, 88, 90)
22
23
24
Yes
Is a signal output from IC5501
(RGBSW)? (pins 30, 32, 34)
25
26
27
Yes
Has the signal arrived at IC4801
(ADC)? (pins 43, 48, 54)
28
29
30
Yes
Is the communication between
each IC (ADC, ASIC) on the
MAIN BLOCK Assy and the
microcomputer normal?
Yes
Replace the MAIN BLOCK Assy.
Waveforms
Input signal: Color-bar (Component 720p/50 Hz)
IC5501 - pin 86 (Y)
22
23
V: 500 mV/div H: 10 μsec/div
IC5501 - pin 30 (Pr)
27
28
V: 500 mV/div H: 10 μsec/div
5
6
No
Select the corresponding signal
with the input selector.
SUB
Is the screen of main side Tuner?
Yes
No
Check around a JA8303.
No
Check around IC5501 and check the communications
between IC5501 and microcomputer.
If there was no problem, replace the MAIN BLOCK Assy.
No
Check the circuits between IC5501 and IC4801.
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.
IC5501 - pin 88 (Pb)
IC5501 - pin 90 (Pr)
24
V: 500 mV/div H: 10 μsec/div
V: 500 mV/div H: 10 μsec/div
IC4801 - pin 48 (Y)
IC4801 - pin 43 (Pb)
29
V: 500 mV/div H: 10 μsec/div
V: 500 mV/div H: 10 μsec/div
6
7
No
Specifications that does not
display in the sub-side.
NG
Check the FFC (J203) between MAIN BLOCK and REAR_IO
Assys. If there was no problem, replace the REAR_IO Assy.
IC5501 - pin 34 (Y)
25
V: 500 mV/div H: 10 μsec/div
IC4801 - pin 54 (Pr)
30
V: 500 mV/div H: 10 μsec/div
KRP-M01
7
8
A
B
C
D
IC5501 - pin 32 (Pb)
26
V: 500 mV/div H: 10 μsec/div
E
F
43
8

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