Toshiba 2577DB: My TV is working (picture and sound), but there is thin bright white horizontal line across the picture about a quarter of the way down. It moves slightly up and down, so it is not burnt in.
When I go into service mode and press '9' for Self Check, the bottom line (labelled 'Block') shows V1 and QV01 in red (sometimes they are white and UV is red.
Is this a fault with the tube or can it be fixed?
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This is an easy repair if you've ever soldered and would not be too costly for a repair shop to do it for you. The problem is a bad Vertical Output IC (usually mounted on an aluminum heat sink with the part on it labeled LA78?? ) and 1 or 2 bad capacitors. Some times you can even fix the problem by re-soldering the contacts of the IC- To find the IC follow the 4 wires that come from the Yoke (which is a contained coil of wires slipped over the neck of the picture tube(s)) back to the board. 2 of the wires go to the horizontal o/p and 2 to the Vertical o/p the thinner gauge wires are for the vertical.
a bright thin line in centre is called horizontal line.
first of all do not keep tv on unless it is rectified.
If you want to put on tv keep brightness minimum to protect your screen for any demage.
your problem is in vertical section.
1 check vertical supply.
2 check parts in vertical section or loose contact.
3 yoke connrctor loose
4 ic defective
It is not serious problem can be rectified easily
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!