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Sound's like your tv just died on you. It will probably cost more to fix it then to replace it.
Buzzing is a common defect among plasma TVs regardless of brand. The buzzing you are hearing is probably a sign of a defective board or power supply or something similar. Either way, you'll need to fix it or get a new television set.
I know plasma television's are cheaper for larger sized sets but I never recommend plasma's to any of my customer's unless they are buying it for a large sized darker room (such as an in-house theater)
If you want a good, bright, clear picture I would stick with an LCD. If you want a higher end you could go with an LED. They both offer less glare than the plasma plus they are better to use with HD devices such as blu-rays & viideo game systems.
i have a mitsubishi i bought a bulb from this dealer and i enstalled it now i believe that the picture isn't bright enough or is it just me? could a bulb not be bright enough that it gives a draker picture
Good Day, cantseewhat;
It sounds like your TV has a problem. It could be and most likely be CRT Coolant on the circuit boards. If you handy, then clean PCB's with acetone on areas which fluid appear. If not handy call aN Authorized Sevice Center and have them give you a written estimate B4 repairs. Cost $450.00 to 650.00 depending on your location. Good Luck, big IRISH.
It looks like you are having a high voltage problem where one or more of the HV components are failing. The picture starting off small and the growing as the TV heats up is a sign of this (high voltage) problem. The problem experienced when a bright scene occurs is due to poor high voltage regulation. I would suggest that you take this set to a qualified TV repair shop due to the fact that the section I am talking about deals with voltages that can be fatal.
I hope this helps,
I did some reading on the net, try to "calibrate the screen". Try set the input to 1080i, then run the thx optimiser to give you a starting point, then try a bluray with a bright image.
Keep replaying the same chapter and try raising and lowering different settings. you may find that your brightness is set way too high and after dropping it from 90 to 29, you may find that detail will have crept into the image. Try giving the colours a boost as well.
The detail in HD is very subtle, and having a properly calibrated screen will make all the difference. So to answer your question: set your input to 1080i, make sure your HDMI is outputing RGB and start tweaking that screen!
I don't know your model of set very well. I will comment in general. I am assuming your set is using three CRT's for its projection system.
This is normaly a voltage regulation fault. As the CRT's pulls more current, the HV is dropping. A lower anode voltage means lower cathold current. What this does is lower the mass of the electron beam that is hitting the front phosphor in the tubes. Because of the lower electron mass, the deflection yoke has an easier time to pull or deflect the beam for scanning. And, thus the picture appears to increase in size.
If you look at low cost CRT TV sets, it is very common that the raster changes size a little with contrast and brightness change. This is because they use less quality of HV regulation.
Check the main power supply to see if it is stable with wide variation of picture contrast. Also, if you have an HV probe, check to see if the HV at the anodes of the CRT's is stable with changes in the picture contrast and brightness.
If the main power supply is stable, and the anode voltages are changing, then I would try the HV multiplier and flyback assembly.
This can also get a little complicated to troubleshoot. There is some regulation feedback reference from the HV drive that goes back to the HV generator circuit. There may be a fault in this area as well. Where this gets interesting to troubleshoot is where the horizontal scan drive is also the HV drive, as like most common CRT sets.
Some sets use scan compensation to also help for stability. They will control the gain of the scan amplifiers to help stabilize the scanning to make up the error difference in the HV regulation.