After the t.v. is on, picture is fine. When I change channels - either by the channel seleector or my numeric input, the picture goes black but the sound stays. I can turn the set off and back on and the picture and sound return with the new station.
This has just started after a 9 day vacation without the t.v. being used.
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I could be wrong, but it sounds like the TV hasn't gone through channel setup. You have to do this in order for the TV to "learn" the channels, assuming you are using cable. If you are using cable run channel search in the setup menu and see if that changes anything. Can you change channels by manually entering in the channel # and hitting enter?
Hello, This will require you opening the back cover of the television to test some component with the use of an ohmmeter. This may be a slight drift - like someone is messing with the fine tuning or such a substantial change in tuning frequency that the channels go by as though you are surfing.
Possible causes depend on tuner type:
1. Quartz tuner (10 button direct access digital synthesizer) - For a slight drift, a component is probably changing value, possibly the crystal in the reference oscillator. For gross changes - flipping through channels - it is more likely to be a digital control problem - the microcontroller is misdirecting the synthesizer to change frequency.
2. Varactor tuner (buttons but not direct channel access) - If only a single pushbutton selection is the problem, the the varactor tuning diode for that button is probably changing capacitance. If all channels in a band (Vl, Vh, U) are having a problem, it is more likely to be a drifting D/A or faulty AFT (Automatic Fine Tuning) circuit or power supply.
3. Turret or switch tuner (Knobs) - A component like a capacitor is changing value.
You will have to get in there with a heat gun or cold spray and track it down the old fashioned way. At least, the problem is almost certainly localized to the tuner box (and possibly the controller if applicable).
As noted, gradual slight changes in tuning are likely due to frequency determining components drifting.
Uncontrolled channel surfing is probably a logic problem. For the quartz tuner, this could still be marginal connections causing the microprocessor to misdirect the synthesizer to change channels.
For the latter case, particularly, the cause may still be bad connections resulting in loss of channel memory and/or erratic behavior. Take care...
Hello, it sounds like your inverter board is goin out on the set, when you change channels if you notice on almost any TV the screen goes dark and the new channel appears, it sounds like you are not getting enough power out of the inverter board to power up the backlight enough to come on. This is why the sound remains because everything else works fine and the sound is connected to the main board.
It is hooked up to Direct TV. When I change the channel on the TV to another input it looks fine but without a picture.
as you do not see tint in another channel means your color section is ok
it is due to video or luminance section.