Hey thanks for the help but I don't have any idea where the purity knobs are located. Is there somewhere on the internet I can get all the info I need preferably free of charge? I really appreciate your help, Thanks!!!
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 500 times.
This is a projection TV, what do you mean purity knobs. What is the problem with your TV set? Sounds like you got some wrong info here? I will be on live tonight if you want to discuss your TV problem.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
You need to turn down the voltage on all 3 crt's. You have a red one, a blue one and a green one. Slowly adjust the knob down until you don't see the shadow any more. Then adjust your color in the user menu.
The LED monitor should light up as Green when the membrane is producing the proper water quality (80%+ TDS rejection). If the LED light stays Red this indicates the RO membrane is bad, all the filters (including membrane) should be changed and system sanitized. The batteries in the TDS monitor should be changed yearly also. Don't have a lot of faith in that indicator light. The best way to test for TDS rejection is with a digital TDS meter which indicates the amount of rejection. Compare the incoming water to the product water of the RO. RJ
This is typically referred to as a color purity problem and can be caused by two main things. The first cause can be stray magnetic fields which can 'magnetize' the TV screen either by something magnetic begint oo close to the screen or having turned the direction of the TV while it is turned on. If this is a purity issue caused by magnetic fields, it can usually be cirrected by powering off the TV for about 1/2 hour and turning it back on. All tube TVs have build in 'degaussing' circuits to cure just this issue.
If this doesn't fix it the other cause is a shifted shadow mask inside the picture tube itself and cannot be corrected.
You most likely have lost red lamp function. This can be caused by a number of issues. None are going to be an easy fix. You can isolate the problem quickly if you are a tech, by doing a red/green gun driver board swap. Pretty much the only thing you can try to do yourself, is take the front panel off the TV, then adjust the color bias knobs usually located somewhere behind the panel. One will control the red, one for blue, and one for green. Mark them before you play with them, so you can return them to the factory settings if needed.
Is it a reddish tint or the picture is just red? Did it just happened, or you are just noticing a gradual change?
Reddish tint: Blue and/or green CRTs are getting weaker. More likely the green CRT. Unplug the unit and somehow remove the back cover, etc. to get a direct view of the CRTs. Use a flashlight to inspect each CRT through its lens. CRTs with excessive wear will show a definite "burn" mark where the picture forms. Compare the center CRT (green) with the other ones. Normal wear in all three tubes is expected. What is important is to notice the difference. A significant wear in one means it has to be replaced, but usually all three have to be replaced in order to get the right purity. This is a major overhaul, and unless the TV has a sentimental value, it's not worth it.
Picture just red: Green and blue CRTs not firing. This is easily observed by running the TV with the back cover removed. Probably a loose connection, but you will need the manual to trace it. You could gently tap the chassis while the TV is running and see if this restores the blue and green CRTs.