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PHILIPS TV MODEL 28PT4523/05

 
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jfk84
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PostPosted: Tue Jan 10, 2006 10:39 pm    Post subject: PHILIPS TV MODEL 28PT4523/05 Reply with quote
Philips tv model 28pt4523/05, chassis MD1.2E ?
Line output transistor short circuit.
Replaced and worked for 4 hours and went s/c again.
Any idea what is causing this ???
No schematics need a helping hand ...
Thanks in advance .
jfk : Confused
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PostPosted: Wed Jan 11, 2006 12:36 am    Post subject: Re: PHILIPS TV MODEL 28PT4523/05 Reply with quote
jfk84 wrote:
Philips tv model 28pt4523/05, chassis MD1.2E ?
Line output transistor short circuit.
Replaced and worked for 4 hours and went s/c again.
Any idea what is causing this ???
No schematics need a helping hand ...
Thanks in advance .
jfk : Confused


Hello,
First off all it is important to replace the Output transistor by the same type.
Second : You will have to check on the solder joints of the connector of the deflection coil (I mean the big coil around the tube )
It is also possible that the blue disc capicitor 1.5 nf 2000 Volts ( very close to the line output transistor ) has a crack and sometimes goes short circuit.
I hope you can repair your tv now.
Greetings
Jeroen Hartman
TV/ Video/ Audio engineer
The Netherlands
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stevie



Joined: 12 Jan 2006
Posts: 3
PostPosted: Sat Jan 14, 2006 12:36 am    Post subject: Reply with quote
It,s always a good idea to resolder the line driver transformer pins after output transistor replacement, I have been caught out on this one before.
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