I had the same problem with the same model. The solution was to replace a capacitor, C622, which is located near a small blue rectangular plastic component. This component is a relay that is controlled by C622. I paid $2.39 for the part, $8.99 for S&H for a total of $11.38. This fixed my problem!
I have found with many televisions that a buzzing noise that changes with the brightness of the screen is usually caused by dust on one or more of the toroidal transformers. Take compressed air and blow it through the air vents at the back of your television or to do a better job you can open it and then blow it out.I hope it helps
The blue part which is buzzing is a relay made by OEG, part number SDT-SH-112DM. It is controlled by the capacitor at C622. I have replaced the capacitor with one of a slightly higher rating as recommended but still have the buzz. Unfortunately the relay is an obsolete part and is very hard to find, at least at reasonable cost. I've read that these coils rarely fail but it looks like modification of a similar relay may be the answer.
Copper wire coil under white plastic cover was the source of my set's buzzing. One application of nail polish to the loose windings of this coil three months ago solved problem AND led to clearer picture.
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This tv problems,have 2 possibilities problems.1 the CRT(Tv tube) itself is dead.This u can hear the CRT Video board connection buzzing noises at the CRT-(Tv tube) head.The CRT is dead,also have a little high volt sparks flashing on the video board components too.2 is the FBT-the Flyback Tranformer is dead.This is a highvoltage transformer,a big black block of plastic with a red wire with a cap hook to the CRT(Tv tube).This will make buzzing sound at the base of the FBT.If it is the FBT-it is repairable,if u still can find the FBT part for ur tv model.This part the FBT is a critical part for the analog tv to work.Require tools and also know basic soldering too a must.
C622 is the real problem. It is a 470 uf capacitor filtering the power
to the blue relay. Radio Shack sells it for $1.29 part number 272-1030.
make sure you observe polarity when you replace it. In other words,
the side marked minus goes on the negative side. Check the markings on
the old capacitor and replace it the same way with new one. The new
capacitor has a higher voltage rating which is even better.
Confirmation:Lee2fixit's solution also worked on a Sanyo 19" TV Model DS19580with 'buzzing relay'.Chassis carriessimilar relay (Type DG1U 12VDC II TV-5 8A 250V~ also by DEC) at location RL601and a 25VDC 470uF electrolytic cap at C622.After confirming the relay was sound and finding no obviously faultedcomponents tied to it, replaced the cap.Bingo, normal operation and a quiet relay.Will post a follow-up ONLY if the fix failsbefore the rest of the TV ..it's almost10 years old after all.Thank youLee2fixit and FixIt.com.
The SDT-SH-112DM is a SPST Form-1A relay. It was hard to find, so I went to Radio Shack and bought a similarly sized and rated relay that was a DPDT (also from OEG). broke off the NC pins, joined (soldered) the switch source lines & removed the unused NO pin so it would fit in the drill holes... works fine!
What are you using as a source? If its a cable/satallite box, double check that first. If its a video input or a scart input, swap out the cables. If it still there you could have an input problem or a filter capacitor going bad. Does the hum get louder with sound? If it does it is an input source and or cables. Good luck
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