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General information

 

Job Number

 

0108-27

 

 

 

 

Equipment type

 

Televsion - 19 inch

 

 

 

Maker + Model #

 

Seleco 19SM422

 

 

 

Made in

 

Italy

 

 

 

 

Comments

 

 

 

 

 

 

Symptoms observed

 

BAD

1

On turning on from stand by, a large spark sound is heard from inside, and the TV shuts off

 

 

 

 

 

 

GOOD

1

Powers up to stand by mode

 

 

 

 

 

 

  Repair notes

 

Full repair description and observations

 

1

When opened, it was noted that the spark came from the Focus part of the CRT base on the RGB plate.

 

 

2

To ensure that the sperking is not due damage/dirt in the CRT base, it was desoldered out and inspected. The focus spark gap  (at the CRT base) was wipe-cleaned. No obvious abnormalities were observed in the CRT base and was inserted back. On switching on, the fault persisted and a spark was formed oround the crt base.

 

 

3

The Focus anode was removed from the CRT palte and insulated for safety purposes. On switching on, the spark was first seen around the G2 connection, and then around the CRT plate.

 

 

4

The G2 wire was removed from the RGB plate and  insulated. On switching on, the spark was now seen from the LOPTX body (on the main board) to the surrounding earth barrier, in a form of a ‘cloudy’ spark. It was obvious that the LOPTX was faulty.

 

 

5

The HR equivalent was found from the HR diemens internet site – which resulted to be an HR 7169. Mireland did not have, but Mapp (the HR agent) did.

 

 

6

The LOPTX was replaced, with obvious measure of discharging the EHT capacitor for reasons of safety.

 

 

7

On switching on, no sparks were formed, and a raster was developed.

 

 

 

Repair summary

LINE OUTPUT TRANSFORMER FAULTY

 

 

 

 




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