CRT TV with Pincushion problem repaired. Model Lenco 6382.doc

5/22/2018 CRT TV with Pincushion problem repaired. Model Lenco 6382.doc

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CRT TV with Pincushion problem

repaired. Model: Lenco 6382

By Jestine Yongon April 4, 2014

A friend of mine brought this TV set to my shop for repair. e brought me this TV set

about t!o years ago and at that time, the main problem !as the po!er supply. Today, he

brought the same e"a#t set but !ith a different problem. ere is the story.

This is the information on the ba#$ of this TV set.

A fe! s#re!s off and this is !hat % found inside. %t is a &ery dusty TV set.
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'n#e % got it #leaned and eye s#anned the !hole board for bad parts, % #ould not find

any. % po!ered the de&i#e and here is !hat %

sa!.

%n my #ountry, !e #all it, (ast )est problem. it might be $no!n to others as pin #ushion

problem. *ifferent names for the same problem. +et the repair begins.

)hen % see a problem li$e that, % usually go dire#tly to the #oil that usually #auses su#h

problems.
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)hen % #leaned and #he#$ed it !ith the Blue ring meter, it ga&e me full light bar. That is

an indi#ation of a !or$ing #oil. % put it ba#$ on board and started loo$ing for parts that

is #onne#ted to this #oil !ith the hope to find the main #ause of this problem.

% found this '-(T and it !as !ritten on the bottom of it (/). That is the '-(T

gets &oltage from the #oil. )hen % #he#$ed for &oltage there % did not get any reading. %

started to tra#e the problem ba#$!ards to find !hy there !as no &oltage there. This

tra#ing led me to this area.
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You #an see the main #oil and the blan$ spa#e is !here the main diode is that supplies

the main '-(T. To my surprise, the diode #he#$ed fine !hen % tested it !ith my

multi meter. % ha&e #he#$ed all that area and % #ould not find anything !rong. Then, it

hit me, !hat if this diode is testing o$ but failing !hen under load. % de#ided to #hange

it.

'n#e % #hanged this diode, loo$ at the result.
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% $no! the pi#ture is not #lear but you #an see a full s#reen. That diode !as the main

#ause of this problem yet, it tested fine. The part number is By2. %t too$ me a !hile

to get it fi"ed but ission a##omplished.

This arti#le !as prepared for you by )aleed ishma!i, one of our aster Authors3 and

#urrently !or$ing in the Bethlehem area of alestine repairing ele#tri#al and ele#troni#

e5uipment.
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CRT TV with Pincushion problem repaired. Model Lenco 6382.doc