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Re: Toshiba tv problem
This looks like a problem either with the powers supply to the video signal processor and with thr power supply to the horizontal section (lack of complete horizontal deflection. This was caused by the voltage and current spikes of the power coming back on rapidly. Now to fix this problem involves coming into contact with hazardous voltages, I would suggest that you not attempt this repair on your own if you do not have a background in electronics. Please take this set to a qualified electronics repair shop
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If those lines are slightly tilted (diagonal) you may be seeing the retrace of the horizontal sweep which isn't supposed to be visible.
At the loss of some brightness, adjusting the screen voltage on the flyback transformer (large, black block with a fat lead connecting to the forward side of the picture tube) may help but it is likely that there is a (possibly bipolar) electrolytic capacitor is failing.
This would be located near the flyback and is marked in some manner as bipolar and will be in the range of 10 - 30 uFd.
If you attempt this yourself, it will require a good deal of caution since there are potentially exposed high voltages in this area.
Some kind of insulated tool is recommended and the flyback will have two (rarely three) adjustment located on it; one will adjust focus, the other screen voltage.
If you are reluctant to try this yourself, it's OK, this kind of DIY isn't for everyone.
this symptom is caused by a poor regulation in the power supply circuit. too low dc supply voltage will result to insufficient deflection, both vertically and horizontally. black borders appear around the raster. receivers generally use regulator in the main power supply to set the dc supply voltage at the value that will allow the picture to fill the screen with a little overscan. defective regulator can result in a small raster. most modern receivers today are using ic (integrated cirduit) regulator. but if you are not inclined with this kind of job, better bring it to a qualified tv technician. good luck!