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General information

 

Job Number

 

0009-29

 

 

 

 

Equipment type

 

TV Colour 24 inch

 

 

 

Maker + Model #

 

Grundig CUC 2410

 

 

 

Made in

 

Germany

 

 

 

 

Comments

 

 

Recommended by Cousin Rita !

 

 

 

Symptoms observed

 

BAD

1

Yellowish / Green Picture, little Red

 

 

 

GOOD

1

Sound and Raster OK

 

 

 

 

2

Good tuning

 

 

 

 

3

Good IR, sound and picture controls

 

 

 

 

 

Repair notes

 

Full repair description and observations

 

1

It was obvious that the blue section is not operating. While testing for some dry joints, on the RGB board, and CRT plate, the Blue appeared a normal coulored picture appeared. The TV was let to operate for 3 days, and the picture never turned to yellow again. It was delivered back to the client

 

 

2

After 1 day, the client phoned that the picture is becoming yellowish again. This time inspection and servicing was done at the client house itself. It was noted that there was no 150V on the collecter of the Blue Video driver, but on cheking further more, the picture came again normal. On tempering the CRT plate sometimes, the yellow picture forms again and turns normally later with obvious location of the dry joint.

 

 

3

It was an obvious sign of a dry joint, but there was no clue on which part of the circuit it is. Hence most all components forming part in the blue section of the RGB plate was desoldered and soldered again. The problem was fixed

 

 

4

Also I replaced the Video amplifier of the blue stage with the green one so that if the video amp is the faulty component, now it lies in the green section, and if it fails, a violet picture will result this time.

 

 

5

After few days, the client complained that the picture has turned VIOLET!!! I went again to her house and repalced all the 3 video amplifiers. I wanted the GF759 transistors but the Grundig parts department (Mirald) gave me the BF881 as a replacement.

 

 

6

The TV was fixed permanently this time.

 

 

 

 

Repair summary

BLUE VIDEO AMPLIFIER FAILING (OPEN CIRCUIT) AT RANDOM INSTANCES.

 

 

 

Precautions, fouls and advises

 

1

When a problem seems to fix by itself, almost always, it will re occur. Hence one must check many times before handing the repaired item to the client to avoid disappointful surprizes.

 

 

2

When going to make repair service at the location of a client be sure to take all neessary tools and parts with you. In this occasion I forgot to take the solder!

 

 

 

 

 




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