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  Fifth 10 Faults By Observing Symptoms

Introduction to Fifth 10 Faults By Observing Symptoms

1. GHOST IMAGE

If an image emerges very close to the picture, it is termed to be Ghost image.

A.  The reason for the defect is Reflected signal. Erect the antenna correctly.

B.  Low quality Booster, feeder wire and tuner.

2. VENETIAN LINES; SOUND OK

If black and white lines emerge on the picture, it is termed as Venetian lines. This type of effect hides the picture and therefore termed as Venetian blind effect.

REASON:

It is because of the co-channel interference. If two dissimilar TV stations being broadcast in similar channel, this fault takes place in a TV receiver. Any channel should be made to receive correctly through adjusting the antenna system.

3. ONLY PLAIN RASTER; NO PROGRAM SOUND

If only a plain light emerge out without snow, it is termed as Plain raster.

REASONS:

A. Lack of availability of AGC and B+ voltages to the tuner.

B. Disconnected IF cable to the VIF stage from the tuner.

C. Defective tuner.

D. Defective transistors, biasing resistors, diodes, IFTs and capacitors in Video IF preamplifier, Video IF amplifier and Video detector.

E. Defective SAW filter.

F. If IC is employed, calculate pin voltages.

G. Dry soldering; copper print cut.

H. Replace the VIF IC, if needed.

I. Defective video driver amplifier transistor and the biasing resistors of it

4. NEGATIVE PICTURE; SOUND OK

If black parts of picture become visible white, and white parts become visible black (such as a negative film of still photo), this type of effect is termed as Negative picture.

A. Polarity reversed video detector diode.

B. Extreme AGC bias and defective capacitor in AGC section.

C. Nonexistence of composite video signal from video amplifier to the AGC stage.

D. Lack of availability of fly back pulses from LOT to the AGC stage.

E. Dry soldering; copper print cut

5. OVER LOADING

After the connection of antenna or cable wire if the screen becomes dark, this type of effect is termed as overloading.

REASONS for this type of effect:

A. Defective transistor or capacitors in AGC stage

B. If IC is employed, calculate pin voltages

C. At last replaces the IC, if needed.

6. PICTURE OK; NO SOUND REASONS

A. Test the speaker, connection of it, and speaker coupling capacitor.

B.  Test the supply voltage of the sound section.

C. Open earphone jack.

D.  Defective output transistors, biasing resistors and sound IF stage.

E.  Dry soldering; copper print out

F.  Open volume control

G.  If IC is employed, calculate the pin voltages.

H.  At last replace the IC, if needed.

7. LOW VOLUME; PICTURE OK

A. Low B+ to the audio output stage

B. Defective speaker

C. Misaligned sound IFTs and coils

D. Defective Volume control

E. Defective capacitors

F. Dry soldering; copper print out

G. If IC is employed, calculate the pin voltages

H. At last replace the IC, if needed.

8. DISTORTED AUDIO; PICTURE OK

A. Defective speaker and the coupling capacitor of it

B. Defective audio output transistors, biasing resistors.

C. Misaligned sound IFTs and coils.

D. Dry soldering; copper print cut.

E. If IC is employed, calculate the pin voltages and al last replace the IC if required.

9. HUM AUDIO; PICTURE OK

A. Defective capacitors and diodes where the supply is engaged for audio section.

B. Second B+ Filter capacitor (in the sound section) might be defective.

10. SOUND BARS IN PICTURE

If bar emerges when sound heard, this type of effect is termed as sound bars in picture. Not proper adjustment of sound trap, Coils and IFTs.

11. NOISYAUDIO (BUZZ IN SOUND); PICTURE OK.

Not proper adjustment of sound trap, coils and IFTs.

PRECAUTIONS TO BE TAKEN WHILE HANDLING THE PICTURE TUBE

A. The picture tube's neck is prepared of thin glass. Do not over tight the screw in the yoke.

B. The CRT's pins may get broken when fixing and removing CRT board. Thus, handle with care.

C. A shield wire should be positioned over the aquatic coating of the picture tube and it must be earthed. If not it will give shock to us.

D. Before disconnecting the last anode point, it must be discharged first with heavily insulated screw drives.

E. Because picture tube is evacuated, if not handled properly, it may get implosion and the result the tube fragments might fly in all directions and may cause critical injury to the close persons. Thus, it should be handled with care.

Let us make out the defects coming out in the picture tube and how to replace the old picture tube with a new one.

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