REPAIRING RECEIVER TELEVISION

REPAIRING RECEIVER TELEVISION SYSTEMBy Sarbini, S.Pd (SMK Muh 3 Yogyakarta)

Teknologi dan Rekayasa

TELEVISION TROUBLESHOOTING

EASY TRICK , ACCURACY IN REPAIRING

SYMTOM FUNCTION : see clearly the symptoms of damage to the display / CRT and then decide on the speaker location

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GEJALA KERUSAKAN TV

1. OFF TOTAL

CHECK : Power (input / output regulator ) Output

voltage: 115V, 24V, 12V, and 5V

2. TV, LED INDICATORS OFF, SOUND GOOD, VIBRATION SWITCHING TRANSFORMER

CHECK : Horisontal block (flyback trafo, horisontal

transistor and capacitor)

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3. ON LED INDICATOR, TV CAN’T

BE OPERATEDCHECK : Horizontal series. Regulator series (dioda voltage devider)

4. THERE IS’T RASTER,SOUND NORMAL (screen remains dark )

CHECK : Video amplifier series Light amplifier series High Voltage Series CRT

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5. ONE RASTER LINE HORISONTAL

CHECK : Vertikal series and oscilator. Vertikal deflection series

6. THE STRIP STRIP ON THE SCREEN AND IS NOT LOST

CHECK : Horizontal osilator series (dry ELCO) Components that have been eaten

accidentally age (the new TV models are rarely found)

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7. THE IMAGE HORISONTAL SHIFTCHECK :

Sinkronisasi seriesVideo buffer seriesAGC series (ELCO usually dry or

leak dioda )

8. THE IMAGE VERTIKAL SHIFT CHECK :

o Vertikal osilator (New series TV caused is leak ceramic capacitor)

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9. IMAGE NARROWSCHECK :

Catu daya output seriesHorisontal defleksion seriesDeflektion yoke

10. LAYER SHORT

CHECK :o Vsize and Vline Potensiometero Vertical defleksi series

(transistor).

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11. HORIZONTAL DILATION CHECK :

Potensio checker wide horizontal Power Supply series Voltage anoda CRT

12. CAPTURING VERTICAL SWEEP

CHECK : Vertikal deflection series Potensio checker vertikal Dry elco

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13. IMAGE CONTRAST LOW

CHECK : series of mixer until video amplifier

series

14. SHOW A FRWARD SLASH OR A NET PATTERN ON THE IMAGE

CHECK : The cause of interference from outside,

(near to the radio transmitter) Keep the antenna is the source of the interference frequency

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15. The TV IMAGES BLUE / RED / GREEN / Cyan / Yellow

CHECK :

RGB Matrics series (value increase resistor / transistor damaged), try to set the VR on the RGB or CRT.

Dry Soldering CRT

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TABEL OF TELEVISION TROUBLE

NO

TROUBLE TYPES CHECKING PARTS

1 Good picture, no sound Series of audio between the IF and the audio speaker

2 Image on the screen is still not clear but the color, sound normal

A series of video detector is broken.

3 Image on the screen rolled up to the middle horizontal axis direction; normal voice

Vertikal series, ussualy capacitor

4 Image on the screen and colour is not clear, sound normal

Video amplifier is broken,ussually transistor.

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TABEL OF TELEVISION TROUBLE

NO TROUBLE TYPES CHECKING PARTS

5 Image on the screen black and white; normal voice

Brace color damaged, usually transistor.

6 Image on the screen is broken; normal voice

Final amplifier is broken

7 Raster have pitted, missing images and sound sing (lost).

Series tuner have a damaged set of AGC does not work

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REPAIRING STEPS

Trouble of TV must be correct

Estimating the damaged block is based on trouble

Divide the block is broken, so that search easier trouble

To more easily in search of damage to the TV,

We must understand the symptoms of damage on each block.