PDP-4271HD
87
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Flowchart of Failure Analysis for The Video System
Is the function correspondeing to
selected signal input selected?
Select the corresponding signal
with the Input selector.
No video from composite or S-VIDEO
No
Disconnect component and
confirm again.
No
Check the circuit between IC4701 and
IC5101 and replace broken parts.
No
The panel is defective.
No
Check the circuit between IC4701 and
IC7001 and replace broken parts.
No
Check around IC4701 and check the
communications between IC4701
and microcomuputer. If there was
no ploblem replace MAIN Assy.
No
Check around the IC that is found to
have failure in communication and
the microcomputer. If there was no
ploblem replace MAIN Assy
No
No
Replace the TANSHI Assy.
Replace the MAIN Assy.
NG
Check the flexible cable between
CN8802 and CN4004.
Check the flexible cable between
CN8803 and CN4005.
No
Replace or reconnect flexible cable.
NG
Yes
Yes
Image for the composite or s-video
signal is not displayed.
⇒
COMP/S1
Is the compornent cable is
connect to jack? (Input2, Input4)
Has the signal arrived at IC4701?
(pin 85, 91, 60)
Yes
Which signal is not output,
main or sub signal?
Is a signal output from IC4701?
(pin 47, 49)
Yes
Has the signal arrived at IC5101?
(pin 148, 158)
Yes
Has the symptom been settled
when the MAIN Assy is replaced?
Yes
Yes
Is the communication between
each IC on the MAIN Assy and the
microcomputer normal?
Yes
Has the signal arrived at IC7001?
(pin 3)
Yes
MAIN
SUB
1
4
8
Is a signal output from IC4701?
5
6
3
7
1
IC4701 - pin 85, 91, 60
V: 500 mV/div H: 20
µ
sec/div
2
IC4701 - pin 57
V: 500 mV/div H: 20
µ
sec/div
3
IC4701 - pin 47 (s-video)
V: 500 mV/div H: 20
µ
sec/div
4
4
IC4701 - pin 49 (composite)
V: 500 mV/div H: 20
µ
sec/div
IC4701 - pin 49 (s-video)
V: 500 mV/div H: 20
µ
sec/div
5
IC4701 - pin 45 (composite)
V: 500 mV/div H: 20
µ
sec/div
6
IC7001 - pin 3 (composite)
V: 500 mV/div H: 20
µ
sec/div
7
7
IC5101 - pin 148 (composite)
V: 500 mV/div H: 20
µ
sec/div
IC5101 - pin 148 (s-video)
V: 500 mV/div H: 20
µ
sec/div
8
IC5101 - pin 158 (s-video)
V: 500 mV/div H: 20
µ
sec/div
Waveforms
Input signal: Color-bar
Содержание PDP-4270HD
Страница 20: ...PDP 4271HD 20 1 2 3 4 1 2 3 4 C D F A B E 2 6 PANEL CHASSIS SECTION 1 2 3 6 4 5 8 8 8 8 8 8 9 13 7 10 12 11 14 ...
Страница 55: ...PDP 4271HD 55 5 6 7 8 5 6 7 8 C D F A B E ...
Страница 189: ...PDP 4271HD 189 5 6 7 8 5 6 7 8 C D F A B E Block Diagram R2S11002AFT MAIN ASSY IC4701 AV SW ...
Страница 190: ...PDP 4271HD 190 1 2 3 4 1 2 3 4 C D F A B E Block Diagram R2S11001FT MAIN ASSY IC4901 Component SW IC ...