High Pitched Noise
 

help.

i have a samsung 30" direct view that just recently starting emitting
this maddening high pitched noise. the sound is coming from inside the
unit, not from the speakers. and lucky me, it's no longer under warranty.

any input would be greatly appreciated.

rj

"Sounds" like a failing high voltage capacitor.

I think that sound often comes from the flyback.
This is NOT a user servicable part if you aren't a trained technician. There
is enough juice in these parts to kill.
YMMV

FROM : http://www.repairfaq.org/REPAIR/F_fl...ml#FLYTEST_005
3.1) What does the flyback (LOPT) transformer do?

The typical flyback or Line OutPut Transformer (LOPT) consists of two parts:

1. A special transformer which in conjunction with the horizontal output
transistor/deflection circuits boosts the B+ (120 V typical for a TV) of
the
low voltage power supply to the 20 to 30 KV for the CRT as well as
provide
various secondary lower voltages for other circuits.

A HV rectifier turns the high voltage pulses into DC and the CRT
capacitance
smooths it. The HV may be developed from a single winding with many many
turns of wire or a lower voltage winding and a diode-capacitor voltage
multiplier.

The various secondary voltages power the logic, tuner, video signal,
vertical deflection circuits, and CRT filaments. In fact, with many TV
designs, the only power not derived from the flyback is for the
keep-alive
circuitry needed to maintain channel memory and provide startup drive to
the horizontal deflection/high voltage system.

2. A voltage divider that provides the focus and screen supplies. The pots
are in this divider network - and these things fail resulting poor focus,
uncontrolled brightness, or fluctuating focus and/or brightness. A total
short could also result in failure of other components like the
horizontal
output transistor. The focus and screen are generally the top and bottom
knobs, respectively. In some TVs, the focus and screen divider and/or
controls are external to the flyback and susceptible to dust and problems
particularly on damp days.


"RJ" wrote in message
...
help.

i have a samsung 30" direct view that just recently starting emitting
this maddening high pitched noise. the sound is coming from inside the
unit, not from the speakers. and lucky me, it's no longer under warranty.

any input would be greatly appreciated.

rj

MTI wrote:
"Sounds" like a failing high voltage capacitor.


My power supply on my cheapo Samsung HDTV died three times. Let me
guess, do you have the TXM3096?

yup TXM3096 . so what did you finally do?

Michael J. Sherman wrote:

MTI wrote:

"Sounds" like a failing high voltage capacitor.


My power supply on my cheapo Samsung HDTV died three times. Let me
guess, do you have the TXM3096?

What did I do? I bought a Sony 34" widescreen. ;) Much better.

Samsung eventually replaced the TXM with a brand new TXN (the next year
model which fixed the power supply problem). But that was after four
service calls over just 11 months. I was really trying to just get a
refund. Terrible television, but at least all my issues were within the
one-year warranty.

The last tv repair guy that came to look at it said he could just do the
service in my house by replacing one part. I think it would be
relatively cheap to have someone service it if you can't work something
out with Samsung. It seems like the power supply issue is quite well
known, so you may be able to work something out even if you're just out
of warranty.



RJ wrote:

yup TXM3096 . so what did you finally do?

Michael J. Sherman wrote:

MTI wrote:

"Sounds" like a failing high voltage capacitor.


My power supply on my cheapo Samsung HDTV died three times. Let me
guess, do you have the TXM3096?

"RJ" wrote in message
...
help.

i have a samsung 30" direct view that just recently starting emitting
this maddening high pitched noise. the sound is coming from inside the
unit, not from the speakers. and lucky me, it's no longer under warranty.

any input would be greatly appreciated.

If the set is working properly otherwise, you are probably hearing a very
common problem in which some component is vibrating in resonance with a
harmonic of the horizontal output frequency. Could be a yoke, capacitor,
transformer, jumper, flyback or IHVT, or a circuit board. The fix could be
as simple as adding a bit of sealer or tightening a screw or as complicated
as replacing a component that requires a great deal of alignment (like a
yoke). You could also be hearing the switching power supply oscillating at
a higher than normal frequency due to a defect causing a higher than normal
current demand. Again, this could be as simple as resoldering a bad joint
or could involve some tricky troubleshooting.

Best to get it checked out ASAP in case there is a load somewhere. You may
do more damage if you keep running it and may make it harder to find the
problem if the set crashes completely.

Leonard Caillouet

RJ wrote:
yup TXM3096 . so what did you finally do?

Michael J. Sherman wrote:

MTI wrote:

"Sounds" like a failing high voltage capacitor.


My power supply on my cheapo Samsung HDTV died three times. Let me
guess, do you have the TXM3096?

If you purchased the TV with a credit card, you may have unknowingly
doubled the warranty for up to 2 years. If you're over the 1 year
Samsung warranty, you still may be under warranty by your credit card
company. Check with them for help getting it fixed.

--
David G.