Text preview for : Sharp bulletin 66FW53H468.pdf part of Sharp Sharp_Bulletins_4 Sharp_Bulletins_4
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DA50 Chassis
Fl
Chart 1 - No 140v rail Before switching on ensure that the aerial is not connected
CTV not faulty CTV not faulty standby mode standby mode
Power Supply Starts
Neon illuminated
No
Plug or Internal fuse has failed Plug or Internal fuse has failed Check Bridge Rectifier,Q701, Q702, Check Bridge and D712 Q703 Rectifier,Q701, Q702, Q703 and D712
Yes
Power Supply Starts For A Few Seconds Only
Press CH+ button on main PWB
No
NICAM or OPC LED's illuminated
Yes
Power supply is working correctly Power supply is working correctly check data communication check data communication (see LED's Fault code table) (see LED's Fault code table)
No Change 140v
IC702 pin15 = 0v
Yes
line Drive Missing line Drive Missing go to chart 2 go to chart 2
Between 20 And 40 Volts
Remove R623
No
Check HT (D720 Cathode)
Short circuit on a supply other Short circuit on a supply other than the main HT than the main HT
Zero
Power supply in standby mode Power supply in standby mode check IC702 check IC702
Note:
Short Circuit
An avalanche diode has been added across C720
HT has increased HT has increased replace IC705 and check replace IC705 and check associated components associated components
No
Protection circuit operating Protection circuit operating Check IC1001 pin 95 Check IC1001 pin 95 (5v = Normal\zero= standby) (5v = Normal\zero= standby)
Power Supply not working Power Supply not working Replace R713 and R714 Replace R713 R714 check D712, Q702 and Q703 check D712, Q702 and Q703
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Sharp Electronics (UK) Ltd
DA50 Chassis
Fl
Chart 2 - 140v rail Present Before switching on ensure that the aerial is disconnected
Line Drive Fault Line Drive Fault Check Q607 (crow bar) Check Q607 (crow bar) and IC801 and IC801
Less Than1.8v
EHT Protection circuit operating EHT Protection circuit operating Check D617 and amplitude of the line fly-back pulse Check D617 and amplitude of the line fly-back pulse
More Than 1.8v
Check IC801 pin 12
NICAM or OPC LED's illuminated
Yes
RGB output Fault RGB output Fault Check IC801 Check IC801
Power supply is working correctly Power supply is working correctly check data communication check data communication (see LED's Fault code table) (see LED's Fault code table)
No
No
No LT supply to RGB output No LT supply to RGB output Q902 and associated Q902 and associated components components
Low
Check IC1801 pin 2 12v
Check Line drive IC801 pin 50
No
Check OSD
Yes
No Video No Video Check Video input selection Check Video stage selection and IF input and IF stage
Yes
Correct Waveform
Check IC801 pin 11
(see waveform)
Incorrect Waveform
Increase Screen control
No Vertical Scan
Vertical Output Fault Vertical Output Fault Ensure IC501 pin 12 = 5v Ensure IC501 pin 12 = Check IC501 +/- supply 5v Check IC501 +/- supply
Reduced Vertical Scan
Vertical Flyback fault Vertical Flyback fault Check R530,Q502,Q503,Q507 Check R530,Q502,Q503,Q507 and D507 and D507
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Sharp Electronics (UK) Ltd
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