Our 8 yr. old Sanyo tv, when first turned on, has the whole picture in a thin line across the screen, horizontally. After about a half hour, a normal picture covering the whole screen will appear. This has happened for two days now.
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This is a problem with the vertical circuit. Look for a small flat IC attached to a heat sink. It should have about 9-11 pins and be marked LA7838 or something similar. Try resoldering the pins first. If that does not resolve the problem, replace the IC. The IC will cost between $10-$20.
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!