Loud buzzing sound from CRT TV.?

Question

I have a 20" Sanyo CRT tv. Picture is excellent and the sound from the speaker is great also. However, when I turn on the TV there is a very loud buzzing sound, which drowns out the tv sound and makes watching it unbearable. Is it a bad relay or something? Any ideas will be greatly appreciated.

Answer 1

Turn down your volume control completely and listen...if the Buzz is gone you need to check every Audio Cable that connects your TV to your Video SOURCE...

If it's still buzzes with the volume low or off, then it's not the High Voltage, it's the VERTICAL YOKE.
The glue on the yoke is drying out and the wire coils are vibrating the entire assembly...

A good TV tech can look at the yoke and determine if it's a removable yoke or one that is permanently cemented onto the picture tube....

Hope for the removable one, because those are cheaper to fix.

Answer 2

Well, assuming it isn't an OLD day's set, which used transformers to step up the voltage for the CRT, ..CRT tecknology hasn't really changed much in the past decades, so i'd still go with the high voltage for the Tube. I haven't opened one up for a while now that everything has been changing form analogue to digital so can be all that precise as I might have been with an older set.

Answer 3

Say if the buzz is high pitch or low pitch , without knowing that then there are a number of possibilities , the vert yoke windings come near the bottom of the list ! I wait to see your Edit
Cheers Pete

Answer 4

Well, if it isn't coming from the speakers then it is probably coming from the high-voltage section. If you are lucky it is just arcing from dust or foreign object. If not then one of the components in the HV PS section is breaking down.

If you feel competent to do it, open the thing up (unplugged) and carefully vacuum out all the dust. Even better, ask a shop to do it for you. That way they can check the HV also.