Question about RCA 32V550T 32" TV

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Tuning problems My set is ok as long as you do not change the channel. When you change the channel the sreens goes black with white lines. I then have to shutdown and unplug the tv. after about 5 minutes the picture comes back when you turn the tv on again. This tv is only about 2 & a half years old.

Posted by roadmaster99 on

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Anonymous

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It is due to loose contact near 1 anrena or cable socket. 2 cable wire loose. 3 loose contact near tuner. 4 tuner b+ line or agc line loose. 5 horihontal hold tunning is not proper.or control loose. hope this will help. good luck.

Posted on Sep 29, 2007

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I am play vcr audio is ok but disply not in the screen vertical backgrond is black & full screen only two white line equali so main display problem so pls help this problem sir some body help me.

I think you are seeing the tuning screen for TV's to be tuned in. Look round the back of the VCR for a switch called TEST Signal. If it's ON set it to off.
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Picture goes in and out

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...
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Not a home repair take it to a repair store.
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