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66FW-54H (serv.man42). Fault finding flow charts for the DA100 (50Hz) chassis - Sharp TV Technical Bulletin (repair manual). Page 3

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NICAM or OPC
LED's illuminated
No
Reduced Vertical Scan
Increase
Screen control
Yes
Power supply is working correctly
check data communication
(see LED's Fault code table)
Power supply is working correctly
check data communication
(see LED's Fault code table)
No Video
Check Video input selection
 and IF stage
No Video
Check Video input selection
 and IF stage
Correct
Waveform
Yes
Line Drive Fault
Check Q607 (crow bar)
and IC801
Line Drive Fault
Check Q607 (crow bar)
and IC801
EHT Protection circuit operating
Check D617 and amplitude of the line fly-back pulse
EHT Protection circuit operating
Check D617 and amplitude of the line fly-back pulse
Less Than1.8v
More Than 1.8v
Chart 2 -  140v rail Present
Before switching on ensure that the aerial is disconnected
Vertical Output Fault
Ensure IC501 pin 12 = 5v
Check IC501 +/- supply
Vertical Output Fault
Ensure IC501 pin 12 = 5v
Check IC501 +/- supply
Vertical Flyback fault
Check R530,Q502,Q503,Q507
and D507
Vertical Flyback fault
Check R530,Q502,Q503,Q507
and D507
Yes
Check
 Line drive
IC801 pin 50
Check
OSD
Check
 IC801 pin 12
Check
IC801 pin 11
(see waveform)
Incorrect
Waveform
No Vertical Scan
No
No
Check
IC1801 pin 2
12v
No LT supply to RGB output
Q902 and associated
components
No LT supply to RGB output
Q902 and associated
components
Low
RGB output Fault
Check IC801
RGB output Fault
Check IC801
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DA50 Chassis
Fl
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66FW-54H (serv.man34) Upgrade of defective opto-coupler Technical Bulletin 3 591.94 KB
66FW-54H (serv.man33) Remote control battery cover has part number Technical Bulletin 1 39.79 KB
66FW-54H (serv.man35) Set resets whilst being watched or switches on from stand-by on its own Technical Bulletin 2 123.72 KB
66FW-54H (serv.man36) Intermittent loss of remote control response set locks up with picture and sound operational Technical Bulletin 1 10.67 KB
66FW-54H (serv.man37) Set takes more than 30 seconds to give a picture Technical Bulletin 1 11.4 KB
66FW-54H (serv.man38) CRT, Megatext, EPROM and part number table Technical Bulletin 2 24.02 KB
66FW-54H (serv.man39) Amendments and additions to the Technical Bulletin 1 38.23 KB
66FW-54H (serv.man40) Details of power factor correction circuit additions. Standard EN61000-3-2 (Harmonic noise on the supply) instructions Technical Bulletin 5 376.27 KB
66FW-54H (serv.man41) Alternative megatext IC Technical Bulletin 1 136.41 KB
66FW-54H (serv.man43) Purity error due to incorrect operation of the degauss circuit Technical Bulletin 1 74.82 KB
66FW-54H (serv.man44) Parts changes and additions to the DA100 (50Hz) chassis Technical Bulletin 3 55.13 KB
66FW-54H (serv.man45) Yellow bulletin summary. Important information Technical Bulletin 3 490.47 KB
66FW-54H (serv.man46) Opto coupler soldering temperature. Technical Bulletin 1 54.39 KB
66FW-54H (serv.man47) Part numbers for larger scale circuit diagrams. Technical Bulletin 1 38.22 KB
66FW-54H (serv.man48) Service counter reset Technical Bulletin 1 21.67 KB
66FW-54H (serv.man49) Removal of PIN code for the post code setting Technical Bulletin 1 20.62 KB
66FW-54H (serv.man15) Faults in the East West Circuit Technical Bulletin 2 149.53 KB
66FW-54H (serv.man25) Simplified procedure for the G2 and Grey Scale adjustments Technical Bulletin 1 11.72 KB
66FW-54H (serv.man17) NVM programming Jig (revision-9) Technical Bulletin 3 98.4 KB
66FW-54H (serv.man18) Selection of NVM blanking jig Technical Bulletin 1 10.39 KB
66FW-54H (serv.man19) Horizontal stage faults Technical Bulletin 2 340.61 KB
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66FW-54H (serv.man16) Set shuts down at start-up Technical Bulletin 1 6.05 KB
66FW-54H (serv.man26) Set will trip (re-boot) once the picture appears Technical Bulletin 1 11.86 KB
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