Sharp AQUOS LC-15L1E, Service Manual

Page: 27 / 148

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 microprocessor operation using terminal software.
A. No display
YES
No link
YES YES OK
YES OK
2
Is 3.3V output available at pin (4) of IC5906?
C. MPEG setup OK is not displayed.
1
Is 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 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 3.3V output available at pin (4) of IC5706?
6
Check IC5704 and Q5705 peripheries.
7
Check IC5902 periphery.
8
Is 1.5V available at TP5902?
9
Is 3.3V available at TP5900?
0
Is 5.0V output available at pin (4) of IC5907?
q
Check IC6500 periphery.
IC5704 failure
1
Is 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.