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  Defects

Introduction to Defects

A. Not sufficient brightness ever after the brightness control is at maximum.

B. Not sufficient black level even after the contrast control is at maximum.

C. Dim light appears because of weak cathode emission.

D. Blue arcing in the picture tube.

E. No light due to opened filament.

The New picture tube to be purchased should be similar model like that of the old one. Proper Care should be taken when checking the biasing voltage of old CRT that should be appropriate to the new CRT. If not, we should arrange for the biasing voltages to the new CRT.

PROCEDURE OF FIXINGA NEW PICTURE TUBE

A. Very first, discharge the final anode point and they disconnect it.

B. CRT board and yoke should be separated from the old CRT.

C. Unscrew the four nuts that are fixed on the cabinet using tubular spanner.

D. eliminate the earth wire

E. Put the new CRT and tight the four nuts on the cabinet by using tubular spanner.

F. Shield wire should be very tightly tied in the external aquatic coating and earthed.

G. CRT and Yoke board should be placed one by one.

H. Last anode point should be connected correctly. Now if we switch on the TV receiver, enough brightness and contrast can be acquired in the picture.

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