Sharp PG-M20S (serv.man11) Service Manual ▷ View online
40
PG-M20S
PG-M20X
PG-M20X
Confirmation of Video Input
Make "Confirmation of Input
Signal Setting".
Signal Setting".
Is there video signal at the land
of C8070?
of C8070?
Is there signal at the terminal C2 of
P8001 (DVI connector)?
P8001 (DVI connector)?
No
Somewhere in the signal route is
defective. Check the capacitors and
resistors between the connector
and IC8013.
defective. Check the capacitors and
resistors between the connector
and IC8013.
The signal source or connector
is defective.
is defective.
Yes
Yes
Yes
No
Go to "Checking of Sync Signal".
IC8025 or IC8013 is defective.
Confirmation of Input Signal Setting
Is the input menu selected
correctly?
correctly?
Are the connectors connected
correctly?
correctly?
Yes
Select the input menu correctly.
No
2
Connect the connectors correctly.
No
1
End
»
PC I/F Unit-4/12
41
PG-M20S
PG-M20X
PG-M20X
Checking of Sync Signal
Is there the vertical sync signal at
pin (11) of IC8363?
pin (11) of IC8363?
Is there the horizontal sync signal
at pin (5) of IC8363?
at pin (5) of IC8363?
Is there the vertical sync signal at
TL8131?
TL8131?
Is the signal generator
(input source) appropriate?
(input source) appropriate?
Are both the vertical and horizontal
signals in appropriate timing?
signals in appropriate timing?
Is there the horizontal sync signal
at TL8130?
at TL8130?
The sync signal is normal.
End of checking.
End of checking.
Yes
No
Make confirmation of input signal
setting.
setting.
No
Yes
Yes
Yes
Yes
Yes
No
IC8330, IC8331 or its periphery
is defective.
is defective.
No
IC8363 is defective.
No
Set the signal source appropriately.
No
2
IC8330, IC8331 or its periphery
is defective.
is defective.
»
PC I/F Unit-5/12
42
PG-M20S
PG-M20X
PG-M20X
Checking of R, G and B Signals
Is the signal type set to RGB?
Set the process mode.
For checking the input signal,
set the signal generator to
gradation signal.
set the signal generator to
gradation signal.
Check TL8169, TL8170 and
TL8180 by oscilloscope.
(MSB bit after A/D conversion)
TL8180 by oscilloscope.
(MSB bit after A/D conversion)
Go to "Checking of GA4 and Its
Periphery".
Periphery".
Select R, G and B individually on
the pattern menu.
the pattern menu.
Does the signal come to C8062,
C8070 and C8078?
C8070 and C8078?
No
No
Set the signal type to RGB.
No
Yes
IC8013 and its periphery are
defective.
defective.
Are there the specified signals at
TL8169, TL8170 and TL8180?
TL8169, TL8170 and TL8180?
Yes
Yes
IC8025 and its periphery are
defective.
defective.
Go to "Confirmation of
Video Input".
Video Input".
»
PC I/F Unit-6/12
43
PG-M20S
PG-M20X
PG-M20X
Checking of GA4 and Its Periphery
Select R, G and B individually on
the pattern menu in process mode.
the pattern menu in process mode.
Is picture outputted appropriately
in R, G and B?
in R, G and B?
Check pins (72), (52) and (32) of
SC8001 by oscilloscope.
These signals are MSB of B/G/R.
SC8001 by oscilloscope.
These signals are MSB of B/G/R.
Check TL8106, TL8107, TL8108,
TL8109, TL81010 and TL81011
by oscilloscope.
TL8109, TL81010 and TL81011
by oscilloscope.
Do the signals selected on the
pattern menu match with those
checked by oscilloscope?
pattern menu match with those
checked by oscilloscope?
Do the signals selected on the
pattern menu match with those
checked by oscilloscope?
pattern menu match with those
checked by oscilloscope?
Is there the clock (32.5 MHz)
signal at TL8114?
signal at TL8114?
No
Checking of GA4 and its periphery
ends.
ends.
Yes
The DLP PWB is defective.
Yes
No
Yes
No
Is there the clock (32.5 MHz)
signal at TL8110?
signal at TL8110?
Does the clock signal come to pin
(78) of SC8001?
(78) of SC8001?
Yes
No
No
IC8025 is defective.
IC8025 is defective.
IC8029 is defective.
Yes
IC8029 is defective.
No
X8005 is defective.
Yes
»
PC I/F Unit-7/12
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