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General information

 

Job Number

 

0203-44

 

 

 

 

Equipment type

 

Television

 

 

 

Maker + Model #

 

Grundig CUC-720

 

 

 

Made in

 

Germany

 

 

 

 

Comments

 

Our own old television.

 

 

 

 

Symptoms observed

 

 

BAD

1

Shivering of picture when cold (until TV warms up after about 15-20 mins)

 

 

 

 

 

 

GOOD

1

 Good raster, sound, tuning and microprocessor functions, etc

 

 

 

 

Repair notes

 

Full repair description and observations

 

1

After seeking advice I was told that this is a fault due to a leeky capacitor in the tuner section.

 

 

2

 The tuner board was removed from the television and after removing its cover, 4 electrolytic capacitors were found in one of the two compartments of the tuner.

 

 

3

 3 of these capacitors were small in capacitance (1 - 2.2 uF) while the other had a larger value (470uF/10V).

 

 

4

The small capacitors had a good capacitance value, while the big one had a low capacitance which increased a little in value when warmed with the hands! Very interersting!! When heated up by soldering iron or flame, the value rose very near to the stated value.   

 

 

5

First I replaced the 3 small capacitors, but the fault was not corrected.

 

 

6

However on replacing the large capacitor, as expected, the fault was repaired and there was no more picture shivering.

 

 

Repair summary

470uF /19V TUNER CAPACITOR LOW CAPACITANCE

 

 




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