Sony Trinitron KV-PF21 Operating Instructions Manual page 20

Troubleshooting (continued)
Symptom
Lines moving across the
TV screen.
1
The indicator on your
TV flashes red a number
of times between
3-second intervals.
TV cabinet creaks.
A "boom" sound is heard
when the TV is turned on.
20
Additional Information
Solutions
• Use the fine tuning (FINE) function.
(page 10)
• Contact your nearest Sony service
center. (page 17)
—
—
Possible cause
• There is interference from
external sources, e.g.,
heavy machineries, nearby
broadcast station.
• Your TV may need service.
• Changes in room
temperature sometimes
make the TV cabinet
expand or contract,
making a noise. This does
not indicate a malfunction.
• The TV's demagnetizing
function is working. This
does not indicate a
malfunction.