After replacing caps transformer starts to buzz

[820uF]

After replacing caps transformer starts to buzz when display is not lid up.
For example if display goes to standby mode it starts to buzz on powerboard.
Is there any general fix for that ?

[Pentium4]

Re: After replacing caps transformer starts to buzz

What caps did you replace? Sometimes small caps can cause buzzing if you don't replace them

[820uF]

Re: After replacing caps transformer starts to buzz

35v 470uF
maby try biger voltage ones there?

[820uF]

Re: After replacing caps transformer starts to buzz

pic of transformer:

[selldoor]

Re: After replacing caps transformer starts to buzz

You could try removing the old solder and resoldering it with new leaded
solder. You could also try varnish or superglue on the windings.

[ben7]

Re: After replacing caps transformer starts to buzz

What brand are the replacement capacitors?

Also, have you replaced the big high voltage filter capacitor yet?

[820uF]

Re: After replacing caps transformer starts to buzz

LG - W1942S
Pics of power board:
http://imgur.com/a/IdW5I
C207 one leg copper is loose from board but works fine.

haven't replaced big high voltage filter capacitor. Seems all flat from top - no need to raplace.



all soldered legs tested with beep function - all good. Also tested loose copper track from various distant points.

[selldoor]

Re: After replacing caps transformer starts to buzz

Testing the transformer legs with a beep function means nothing!.
Remove the old solder and resolder them with leaded solder.