Loud hum when attempting to turn on my RCA F27628 27"TV
TV has been slow to turn on during the last few weeks. Occasionally will turn itself off. Tried to turn it on and a fairly loud hum (not sure of loaction), then a pop. The picture or sound did not come on.
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Re: Loud hum when attempting to turn on my RCA F27628...
Could be that the main b+ filter Capacitor went bad and blew up. Also could have been the horizontal output transistor shorted and the flyback poped. In eather case it would be recommended that you take this set into a repair shop unless your familar with HV circuits in tv sets. Good Luck
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I can't explain the timing of your problem and why it showed up after lamp replacement, but Samsung color wheel failures are usually associated with a rather loud hum. I would removed the back, jumper the lamp door switch and try to determine exactly where the hum is originating from. I think you'll find the color wheel is the culprit.
Three possibilities: the drum bearings may be worn causing hard turning, the motor bearings may be about worn out allowing the rotor to contact the stator inside the motor, and last, but maybe the most likely, the start capacitor, which is mounted near the motor, may be going bad causing weak starts at first, then no-start/loud humming finally. Take the belt off of the motor pulley and start the dryer--the motor should almost instantly be running full speed. You can test the motor bearings (when motor is OFF) by trying to push/pull the shaft in various directions sideways. Any obvious slop is a sign of worn bearings. Try turning the drum by hand to see if it turns fairly freely. Hope this helps!
Your color wheel needs to be changed. Mine just did the same thing. I changed mine, and the buzzing sound went away, however now my picture washes out with light or yellow colors. The darks look green and purple also.
Color wheels do go bad quite frequently, if you got 5 years out of the original, believe me, that's good.
The color wheel is attached be a bearing, like a fan and when the bearing starts to ware out the color wheel on the shaft starts to wobble and that's what you hear, they spin I believe around 3000rpm. Try contacting your servicer again, don't be mad, maybe he'll be kind enough just to charge you for the color wheel. I'm sorry, but that's the best advice I can give you..Good Luck...
I had this issue a few years ago and the power cable from one of the inner terminals had come loose. It was still touching but whenever the sub would really pound it would jump off the connection and then reconnect causing it to hum. It was the most annoying thing ever so I finally pulled off the amp plate (super easy) and you could clearly see the loose wire. I had to use a good soldering iron to put it back on since it's a pretty fat wire. If you're not under warranty anymore then pop the back off and see if that's the issue.
The color wheel is the most common problem in DLPs that cause noise.
To determine the cause:
Turn the set off.
If the noise goes away after about five seconds, then, the problem is the color wheel.
If the noise goes away one to two minutes after shut off, then, the problem is a fan.
You can find an Authorized Servicer in your area that can tell you the price of repair, by clicking on the Samsung link: