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NotTaR of Television Sets : My TV has the shakes
Copyright ©
1994-2007, Samuel M. Goldwasser. All Rights Reserved. Reproduction of this document in whole or in part is permitted if both of the following conditions are satisfied: 1. This notice is included in its entirety at the beginning. 2. There is no charge except to cover the costs of copying.
I may be contacted via the Sci.Electronics.Repair FAQ (www.repairfaq.org) Email Links Page.
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You turn on your TV and 5-10 seconds later, the display is shaking or
vibrating for a second or so. It used to only occur when first turned on,
but now, the problem occurs 3 times in 30 seconds. Of course, many
variations on this general theme are possible.
Some possibilities:
- External interference - did you change anything or move your A/V setup
recently? Do you have a computer monitor nearby?
- Defective circuitry in TV - power supply regulation, deflection,
or bad internal connections are possible.
- Defective video cable (unlikely) - wiggle the cables to be see if
you can induce the problem.
- Loose trim magnets of other magnetic components on or near deflection yoke.
This is somewhat rare but if the adhesive comes apart, the magnetic fields
from the deflection current can cause the parts to vibrate which will
result in a jitter or movement of the picture. There may even be audible
crackling or snapping sounds associated with this vibration.
Note that many of the sources of electromagnetic interference that are
problems with computer monitors like transformers and power lines will
not cause noticeable shaking, wiggling, or jiggling on a TV because the
power line and vertical scan are at almost exactly the same frequency
and any such movement would be very slow.