Sony KV-L34MN11

[TKL]

Need help on this TV model Sony KV-L34MN11. When power ON a start sound can
be heard "Tun", then no audio, no video, relay on power board continuously
'click' sound. How can i start to find the trouble?

Teo

 

[Peta]

If it were mine I would firstly check to find out if the power supply relay is
in good condtion Next disconnect the Line output transistor. If the same problem
still exists isolate the power supply from the rest of the TV. Connect a 75 watt
globe as a load. If there is no change then the problem is probably in the power
supply section. If the power supply now is running ie the globe lights up and
stays on then the problem is that a severe load is being place on the main power
line when you switch the set on which is enough to shut the set down. This is
usually associated with the line output stage, possibly a new line output
transformer is needed. Before replacing the lopt check the vertical output and
sound ICs for shorts and any zener diodes. Check any diodes in the secondary of
the line output transformer. It is never ending until you come to the faulty
part When you do and you then replace it and the TV starts it is a great feeling
that you have made a $5000.00 peice of rubbish come to life.

All the best Peta**

 

[Jerry Greenberg]

The power supply performance must be verified. Then look for any
shorted circuits in the main part of the set, especialy in the scan
sections. It is very common that the HOT, and flyback assy fail
causing this type of fault. If these are failed, you will also have to
find the cause, or they shall most likely fail again when the power
has been re-applied.

These types of faults can be difficult for the home hobbiest to
service. You may find it more feasable to give the set out to an
authorised service center to repair. You may end up spending a lot on
parts, and still have re-damage or no results. It is best to have the
service manual, training, test tools, and proper setup to service
these sets. There are also many safety issues when servicing a TV set.

Jerry Greenberg
http://www.zoom-one.com

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"TKL" <kunlong@singnet.com.sg> wrote in message news:<c0qml2$n9h$1@mawar.singnet.com.sg>...

Need help on this TV model Sony KV-L34MN11. When power ON a start sound can
be heard "Tun", then no audio, no video, relay on power board continuously
'click' sound. How can i start to find the trouble?

Teo