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Piincaution

 
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Gilles_Gilles



Joined: 15 Oct 2006
Posts: 2
Location: Québec

PostPosted: Sun Oct 15, 2006 9:00 am    Post subject: Piincaution Reply with quote

Hello,
I have a Hitachi model TE-8706 with a Pincaution problem
the picture a round in corner
any idea what could cause that ?
Thanks
where I could find the service manual I know it's an old tv but not use very much and very clean picture if I can remove that pincaution problem


Last edited by Gilles_Gilles on Sun Nov 05, 2006 2:10 pm; edited 1 time in total
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HughIreland
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PostPosted: Tue Oct 17, 2006 2:46 am    Post subject: Pin cushion problem Reply with quote

Hi...
Don't know this model , sorry . I would look for a bad FET or Bipolar transistor that modulates the B+ line to HOT via Flyback . This modulation changes the width of horiz sweep lines .
Transistor will most likely be a TO 220 package with a small heatsink . That is the old way in a lot of monitors . Most TV will use a change in the base driving signal for the HOT called the E-W correction .This may be a loss of value in memory , service manual would be helpful ,but,I do not have one.

Good luck
Hugh Ireland
Hugh's electronics and computers
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Gilles_Gilles



Joined: 15 Oct 2006
Posts: 2
Location: Québec

PostPosted: Sun Nov 05, 2006 9:55 pm    Post subject: pincaution Reply with quote

Hi,
what could cause a pinaution problem on a hitachi
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