Read Sharp PG-B10S (serv.man17) Service Manual online
37
PG-B10S
TROUBLESHOOTING
YES
YES
NO
Checking the basic
operation
Does the power LED light
up or flash in red or green?
up or flash in red or green?
Go to "Checking the
power unit".
power unit".
Go to "Checking the lamp
light-up".
light-up".
NO
Does the set function with
its keys or the remote
controller?
its keys or the remote
controller?
Go to "Checking the
microprocessor circuits".
microprocessor circuits".
NO
Go to "Checking the RGB
signals".
signals".
Go to "Checking the RGB
isignals".
isignals".
Go to "Checking the
video signals".
video signals".
End
NO
Is the cooling fan running
with the lamp on?
with the lamp on?
Is the user menu
displayed?
displayed?
YES
YES
38
PG-B10S
YES
YES
YES
YES
Checking the power unit
Are the P701, P711 and
P741 connectors tightly
connected?
P741 connectors tightly
connected?
Reconnect the P701,
P711 and P741
connectors tightly.
P711 and P741
connectors tightly.
Replace the bimetal switch.
Replace F701.
NO
NO
NO
Check IC721, R738, R739
and their peripheral ICs for
damages. Replace any of
them as required.
and their peripheral ICs for
damages. Replace any of
them as required.
NO
Is the bimetal switch in
good condition?
good condition?
Is there AC voltage (100-
240V) applied across
C701?
240V) applied across
C701?
Disconnect the P741
connector. Is there 6V
output at pins (11) and
(12)?
connector. Is there 6V
output at pins (11) and
(12)?
Check the main PWB for
short-circuit.
short-circuit.
39
PG-B10S
YES
YES
YES
YES
YES
NO
Checking the
microprocessor circuits
Is there about DC3.3V
applied between pins (3)
and (5) of IC1703?
applied between pins (3)
and (5) of IC1703?
Check IC1703 and its
peripheral circuits, or IC1702
and its peripheral circuits.
peripheral circuits, or IC1702
and its peripheral circuits.
Is the lamp cover or filter
cover tightly closed? Or is
the P2006(LF) jack tight
in position?
cover tightly closed? Or is
the P2006(LF) jack tight
in position?
Check IC2002 and its
peripheral circuits.
peripheral circuits.
Check IC8202, IC8203,
IC2601 and their
peripheral circuits.
IC2601 and their
peripheral circuits.
Check IC1704 and its
peripheral circuits.
peripheral circuits.
NO
Is there about DC2.5V
applied between pins (5)
and (8) of IC1704?
applied between pins (5)
and (8) of IC1704?
NO
Check IC8009 and its
peripheral circuits.
peripheral circuits.
NO
Check the fan for unusual
run. Or check IC8003 and
its peripheral circuits.
run. Or check IC8003 and
its peripheral circuits.
NO
Is there about DC2.5V
applied between pins (3)
and (4) of IC8009?
applied between pins (3)
and (4) of IC8009?
Is there about DC3V
applied at pin (21) of
IC2002? Check the D0 thru
D7 signals with an
oscilloscope: Are there
pulse signals?
applied at pin (21) of
IC2002? Check the D0 thru
D7 signals with an
oscilloscope: Are there
pulse signals?
Close the lamp cover or
filter cover tightly. Or
insert the P2006(LF) jack.
filter cover tightly. Or
insert the P2006(LF) jack.
YES
Check IC8010, IC8011 and
their peripheral circuits.
their peripheral circuits.
NO
Is there 133-MHz clock
output at pin (6) of IC8010?
Is there 75-MHz clock
output at pin (6) of IC8011?
output at pin (6) of IC8010?
Is there 75-MHz clock
output at pin (6) of IC8011?
40
PG-B10S
YES
YES
YES
YES
NO
Checking the lamp
light-up
Insert the P741 and P742
harnesses tightly. Or
replace the harnesses as
required.
harnesses tightly. Or
replace the harnesses as
required.
Go to "Checking the
power unit".
power unit".
Is high-pressure noise
heard?
heard?
Replace the lamp.
NO
Go to "Checking the
microprocessor circuits".
microprocessor circuits".
NO
YES
Is there DC350-400V
voltage applied between
the P712 pins?
voltage applied between
the P712 pins?
NO
Is the lamp tight in the
socket?
socket?
Insert the lamp tightly in
the socket.
the socket.
Are the P741 and P742
harnesses tightly
connected on both the
power and ballast units?
Or are the harnesses in
good condition?
harnesses tightly
connected on both the
power and ballast units?
Or are the harnesses in
good condition?
Are there 3V (High level)
voltage and over-1V
voltage applied at pins (6)
and (3), respectively, of
P741 on the power unit?
voltage and over-1V
voltage applied at pins (6)
and (3), respectively, of
P741 on the power unit?
NO
Replace the ballast.