Read Sharp LC-15L1E (serv.man8) Service Manual online
27
LC-15L1E
»
Wireless Center (TX) side fault-finding flowchart with no link
NO
NO
NO
NO
NG
NO
NO
NO
NO
NO
Go to the
step A.
9
.
OK
YES
NO
Replace
the cable.
YES
YES
OK
YES
OK
YES
Check the microcomputer operation using terminal software.
A. No display
YES
No link
YES
YES
OK
YES
OK
2
Is normal +3.3V output available
at pin (4) of IC5906?
C. MPEG setup OK is not
displayed.
1
Is normal +1.5V available at
both ends of L6000, and
+3.3V at both ends of L6001?
D. No display after APOLL2
startup
1
Check IC6701 periphery.
3
Go to the step E.
2
.
E. All displays are normal.
3
Replacement of UNT6700
did not help recover normal
operation.
4
Check the peripheries of
pins (40)-(43) of IC5704.
5
Check CN5200 peripheries.
1
Using a spectrum analyzer
or the like, check that output
signal has RF waveform.
2
Check that the cable
connecting CN5200 and
UNT6700 has no
interference or damage.
2
Is normal +3.3V available at
each of the following pins of
IC6701?
(1), (8), (31), (37), (44), (54),
(67), (73), (80), (90), (103),
(109), (116), (126), (133) and
(139)
3
Is output signal waveform normal
at pin (13) of IC5704?
4
Is normal +3.3V output available
at pin (4) of IC5706?
6
Check IC5704 and Q5705
peripheries.
7
Check IC5902 periphery.
8
Is normal +1.5V available at
TP5902?
9
Is normal +3.3V available at
TP5900?
0
Is normal +5.0V output available
at pin (4) of IC5907?
q
Check IC6500 periphery.
IC5704 failure
1
Is normal +9V available at pins
(1)-(3) of CN5002?
Check for connector
damage or cable
disconnection.
Check IC5906
periphery.
Check L6000
and L6001.
Not serviceable
Check FL5701
periphery.
Check IC5706
periphery.
Check Q5904
periphery.
Check Q5902
periphery.
Check IC6501 and
Q5903 peripheries.
Go to the step B.
1
.
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