Sharp PG-C20XE (serv.man6) Service Manual ▷ View online
35
PG-C20XU
PG-C20XE
PG-C20XE
AN-Z7T
YES
YES
Checking the output line
Are there video input signals at
TP1401, TP1402 and TP1403?
TP1401, TP1402 and TP1403?
NO
Check Q8013, Q8014,
Q8015 and their
peripheral circuits.
Q8015 and their
peripheral circuits.
NO
Check IC8024 and
IC8025.
IC8025.
IC8023 defective. Replace the PC
interface.
interface.
NO
Check IC1405, IC1403 and their
peripheral circuits.
peripheral circuits.
NO
Check P8001 and SC1701 for solder
cracks.
cracks.
YES
YES
Are there video output signals at
pins (14), (16) and (18) of IC1405?
pins (14), (16) and (18) of IC1405?
Check IC1102, IC1202, IC1302 and
their peripheral circuits as well as
pins (35) and (36) and the 15.5V
power line.
their peripheral circuits as well as
pins (35) and (36) and the 15.5V
power line.
IC8023 defective.
Replace the PC
interface.
Replace the PC
interface.
IC8023 defective.
Replace the PC
interface.
Replace the PC
interface.
Check IC1402, IC1404 and their
peripheral circuits.
peripheral circuits.
Check SC1101, SC1202, SC1301
and their peripheral circuits.
and their peripheral circuits.
Check the R, G and B panels.
Are there input signals at SC1101,
SC1201 and SC1301?
SC1201 and SC1301?
Check IC1101, IC1201, IC1301,
IC1102, IC1202, IC1302, IC1401,
IC1403, IC1405 and their peripheral
circuits.
IC1102, IC1202, IC1302, IC1401,
IC1403, IC1405 and their peripheral
circuits.
NO
YES
Are there video input signals at pins
(45) of IC1101, IC1201, IC1301,
IC1102, IC1202 and IC1302?
(45) of IC1101, IC1201, IC1301,
IC1102, IC1202 and IC1302?
Check P8001 and SC1701 for solder
cracks, and go to "Checking the
digital signal processing circuit".
cracks, and go to "Checking the
digital signal processing circuit".
NO
NO
YES
YES
Are there clock input signals (MCLK) at
pins (54) and (55) of IC1102, IC1202
and IC1302?
pins (54) and (55) of IC1102, IC1202
and IC1302?
Are there output signals at pins (17),
(19), (21), (28), (30) and (32) of IC1101,
IC1201, IC1301, IC1102, IC1202 and
IC1302?
(19), (21), (28), (30) and (32) of IC1101,
IC1201, IC1301, IC1102, IC1202 and
IC1302?
Check P8001 and SC1701 for solder
cracks, and go to "Checking the
digital signal processing circuit".
cracks, and go to "Checking the
digital signal processing circuit".
NO
NO
NO
YES
Are signals going to the control signal
lines at pins (3) thru (21) of IC1103,
IC1203 and IC1303?
lines at pins (3) thru (21) of IC1103,
IC1203 and IC1303?
YES
YES
Are signals coming from the control signal
lines at pins (11) thru (17) of IC1402 and
IC1404?
lines at pins (11) thru (17) of IC1402 and
IC1404?
Are there digital input signals at pins
(1) thru (33) of IC8024?
(1) thru (33) of IC8024?
Are there video output signals at pins
(42), (44) and (46) of IC8024?
(42), (44) and (46) of IC8024?
36
PG-C20XU
PG-C20XE
PG-C20XE
AN-Z7T
YES
YES
YES
YES
NO
NO
Checking the RGB input
Feed the sync separation RGB
signal to INPUT1 terminal (pin
(15) of D-SUB).
signal to INPUT1 terminal (pin
(15) of D-SUB).
Go to "Checking the sync signal".
Do R, G and B colors appear?
Does an image appears?
Is the contour as specified?
Are there disturbing vertical
stripes?
stripes?
Select INPUT1 (RGB) with the
set’s control or remote control
button.
set’s control or remote control
button.
NO
Go to "Checking the RGB input".
NO
Go to "Checking the input signal
setting input".
setting input".
IC8026 or peripheral circuit
defective.
End
YES
NO
Is the image disturbed? Does
NO SIGANL indication
appear?
NO SIGANL indication
appear?
1
2
37
PG-C20XU
PG-C20XE
PG-C20XE
AN-Z7T
YES
YES
Checking the input signal
setting
Is the input signal setting
as specified?
as specified?
Select the specified signal.
Is the connector properly
connected?
connected?
NO
Reconnect the connector.
End
NO
1
2
YES
YES
YES
YES
Checking the sync signal
Is there vertical sync signal
at TP8003?
at TP8003?
Is there horizontal sync
signal at pin (3) of IC3008
connection terminal PWB?
signal at pin (3) of IC3008
connection terminal PWB?
IC3008 or its peripheral
circuit defective. Or
SC3003 in poor contact.
circuit defective. Or
SC3003 in poor contact.
Is there horizontal sync
signal at pin (3) of IC3006
connection terminal PWB?
signal at pin (3) of IC3006
connection terminal PWB?
IC3006, IC3010 or their
peripheral circuit defective.
Or SC3003 in poor
contact.
peripheral circuit defective.
Or SC3003 in poor
contact.
Is there horizontal sync
signal at TP8002?
signal at TP8002?
NO
End
SC3001 or its peripheral
circuit defective.
circuit defective.
NO
NO
NO
38
PG-C20XU
PG-C20XE
PG-C20XE
AN-Z7T
YES
YES
YES
NO
NO
Checking the RGB signal
In order to check the input
signal, set the signal
generator to the gradation
signal.
signal, set the signal
generator to the gradation
signal.
Are there gradation signals
at pins (8), (10) and (12) of
IC8012?
at pins (8), (10) and (12) of
IC8012?
Are there gradation signals
at pins (16), (18) and (20)
of IC3002 connection
terminal PWB?
at pins (16), (18) and (20)
of IC3002 connection
terminal PWB?
IC3002 or its peripheral
circuit defective. Or
SC3003 in poor contact.
circuit defective. Or
SC3003 in poor contact.
Using the oscilloscope,
measure the lands (R, G
and B inputs of IC8026) of
C8204, C8208 and C8213.
Are there specified
measure the lands (R, G
and B inputs of IC8026) of
C8204, C8208 and C8213.
Are there specified
IC8026 or its peripheral
circuit defective.
circuit defective.
SC3001 or its peripheral
circuit defective.
circuit defective.
IC8012 or its peripheral
circuit defective.
circuit defective.
NO
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