After not having turned on the set for a few days, I turned it on today to first see blurriness down the left hand side of the screen. This seemed to resolve itself after a short period of time. However, with a few hours (2 or less) the picture started to degrade, beginning with discoloration and blurriness and vertical white lines across the screen. The color seemed to cycle through red, white and greenish tints and gets worse. When the TV is turned on now, there's a "rainbow" along with a thin green line across the middle of the tv. When the set is shut off, there's a circular area slightly to the right of center with red/green around black. Wondering what this could entail, as this is an HD CRT TV. Thanks in advance!
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Re: Sudden color/picture distortion
You have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.
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No.The tv video board have dead components,that the board where it is connected to the CRT-(tv picture tube).Troubleshooting that video board and changes parts should fix ur tv problems.Hope ur tv problems,it is not the video board main big IC colors processor inverter.This big IC is a pain to change and probally not in the market anymore.Troubleshoot test all the capacitors around that big IC colors processor inverter alot of times just those few capacitors are dead only.
Color wheel would be cause of hum noise and distorted picture on screen. Please note that color wheel is not user level repair and requires expertise because it is located in light engine, the most sensitive and expensive part of dlp tv. If you are good with electronics stuff fix then have service manual copy in hand to start inspecting color wheel.
is the blurry all around the picture have different color like a smear of red, blue or yellow? if it is i think the posistor of your tv is not working. it is the one who activate the degaussing coil around the picture tube the prevent color miss-landing upon opening your tv set.
This could be a defect in the degausing circuit, but to confirm, please supply the make and model and a mre detailed description of the colors on the screen. You can try unplugging the set for 10 minutes and then turn on the set. That may reset the circuit enough to confirm the problem. Please update this with the results of that experiment and we'll continue from there.
You either have a bad CRT or a Shorted Red Output IC/Transistor. One other possibility is if
someone turned the Screen Control down if it is accessible from the back of the set.
Hope this helps,
I too had the same problem where my HT30744 TV would lose its color or picture would get blurry. My mom's HT32744 would have the same problem too. They both are refurbished models bought at Value City Dept store.If I gave the cabinet a good hit it would mostly fix the color, but it could also make the picture go fuzzy too, a clear sign of just a loose connection somewhere. So after my wife telling me she was sick of this almost 2 year problem and she was going to buy a new TV on the weekend, I figured I had nothing to lose. So I took the rear cabinet off, unseated the card mounted on the picture tube, applied a little dielectric grease on the connector on the card and reseated the card, removed, re-greased and reattached the card. I have had no problem with either my or mom's which I did the same to since! This is an easy fix that anyone can do. The hardest part is moving the TV and reassembling the rear cabinet. Do not pull the cabinet back out more than you have to, to ease the reassembly of it.
I believe your set has a loose conection that needs to be resoldered ,every time you hit it reacts and that is good,you need to use a wooden or rubber handle to tap in the main board,around the tuner and in different areas until it reacts,be attentive when it does so you can flip the board and resoldered the area that made it react,once the problem is corrected you need to resoldered any other overheated areas and there should be a few in your set,check the grounds in the tuner(where the coax goes in the inside,is a silver box),the horizontal driver transformer and output transformer.Be careful while you do this and stay away from the thick red wire going to the back of the picture tube specially when the set is on.
Let Us know how it goes or if you need more information.
Your deflection yoke (a coil around the neck of the picture tube) must have gotten turned.
Your can turn the picture upside down by rotating this coil.
If your set is in warranty, you should return it. When this "yoke" is adjusted the color is affected too. If you try this yourself you'd void the warranty and mess up your color.
The keyword for me here is blurred "at first,a bad bulb will only give you a dark picture being defective or with too many hours,The bulb is not consider a part ,is an accessory to the manufacture and is part of the market strategy.The problem in your set might be an slow charging capacitor in the power supply or in the ballast board,the ballast board is in charge of the supply volts to the lamp,if you are familiar with tv service you can check these circuits but if you are not too familair be safe and call for assistance from a servicer.Let Us know if you need more information.