Question about Standard (CRT) Televisions

2 Answers

Green picture, adjusting the color controls doesn't help. Everything else OK. Help?

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  • Anonymous Mar 29, 2008

    Green screen and picture. Unable to adjust. Everything else is good.

  • Anonymous Jul 06, 2008

    the screen looks green.

  • collectiques Dec 29, 2008

    I too Have the 27U-S60 model with a slightly green tinge in the picture. Notably the problem started immediately when I fired-up the set after a little old lady had the TV which was not in use for some time d/t being blind. I would like a set of schamatics for I have some technical experience as a licenses amatuer radio technician/operator. If I can isolate which transistor it is, I feel I can replace it without any problem. Please assist with schamatics and/or voltage charts, etc. e-mail me at: collectiques4u@hotmail.com.

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Hi,

Most problems of this nature indicate trouble with the color driver.

Most TVs have three (3) color drives for red, blue and green. it would appear that your particular unit developed a fault with the green drive. Normally these are transistors (but there are IC versions). Further, they are often on a squarish small PCB right at the rear of the neck of the CRT. Often also, they are with a heatsink.

Corrective measure would require replacement. Doing this would require that you be familiar with electronic components and circuitry, use of a DVM and a soldering iron. Should you be uncomfortable doing this, you may then need the services of a professional TV technician.

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Posted on Feb 04, 2008

The 1.5k resistor in the load circuit of the green output transistor is open. This is on a small pc board plugged into the CRT. -- Al

Posted on Feb 10, 2008

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1 Answer

I just need to adjust the resolution on this TV. NO ONE at RCA could seem to help me. Thank you.


hi,
did u mean to adjust the picture setting then go for the following
1 press menu on the remote
2. using down arrow select picture quality and press ok. available options in picture quality and its use is listed below. you can use it according to your preference.

Basic Picture Control- Displays the five slider controls for adjusting

the way the picture looks.

Contrast Adjusts the difference between the light and dark areas

of the picture.

Color Adjusts- the richness of the color

Tint Adjusts the balance between the red and green levels

Black Level Adjusts the brightness of the picture

.

Sharpness Adjusts the crispness of edges in the picture.


When exiting this menu, the Save Personal Picture Preset choice list will

appear. You can choose either Yes or No. If you save the settings as a

Personal Picture Preset, the TV will store the settings so you can reselect

them easily if someone changes the settings.

Picture Presets Displays- a choice list that lets you select one of three

preset picture settings: Bright Lighting, Normal Lighting, Soft Lighting

or Personal Picture Preset. Choose the setting that is best for your

viewing environment.

Auto Color Displays- a choice list that lets you turn on the feature that

automatically corrects the color of the picture. (This is especially useful

for tracking realistic flesh tone colors as you switch from channel to

channel.) Choose On or Off, depending on your preference.

Color Warmth Displays- a choice list that lets you set one of three

automatic color adjustments: Cool for a more blue palette of picture

colors; Normal; and Warm for a more red palette of picture colors. The

warm setting corresponds to the National Television Standards

Committee (NTSC) standard of 6500?K.

Video Noise Reduction Displays- a choice list that lets you turn on the

feature that automatically reduces noise from the picture. Audiovariable

enables the TV to automatically adjust noise reduction level;

off turns off noise reduction feature; on-fixed sets a fixed level of noise

reduction.

Dec 21, 2010 | RCA G36705 36" TV

1 Answer

Samsung txh1970 tv screen has green tint


I encountered the same problem with a color computer monitor several years ago. Everything went green. The repair techies told me that's a sign that the power supply is going bad. You will not be able to adjust the color. You will have to either fix it or replace it. Hope this isn't a common problem with this model Samsung TV.

Dec 01, 2008 | Samsung TXH1970 TV

1 Answer

Sony KV-32FV27 ...no Green?


HI

You have defective RGB Circuit, Check the green Gun Cathode path, maybe you have open resistor or open driver transistor. or open Variable resistor.

Thanks!

Nov 28, 2008 | Sony KV-32FV27 32" TV

1 Answer

Zenith Model SY2551S 1996 27" - Green Tint


The core problem with the green tint is the aging of the picture tube, and can be compensated a bit by using either the green drive control usually located on a printed circuit board on the neck of the picture tube or on the main chassis. There will be 3 main controls which will adjust the red and blue as well. If these controls are not present then you will need to get into the service menu and adjust it from there. Don't adjust anything else as you can make the set much worse. Also remember that in order to make these internal adjustments while watching a black and white picture (turn the color all the way down) you will have your hands and arms near live circuits that could shock you and cause injury to yourself as well as break parts inside the set when you pull back after being zapped (voice of experience here) Of course if you can do all this by the service menu then you won't even have to remove the back of the TV.

Sep 08, 2008 | Zenith C27A24T 27" TV

1 Answer

Greenish color whole screen


THERE IS APROBLEM IN VIDEO SECTION.OR CRT TUBE .REPLACED CRT BASE AND GREEN CATODE TRANSITOR OR WHOLE BASE IT WILL WORK OK

May 20, 2008 | Memorex MT201224 20" TV

1 Answer

Green tint I can't seem to fix


Hopefully someone on here has a manual and can tell you exactly where the tint controls are. Also need to try adjusting the color level, turn it clear down so you have a black and white picture.
Is the picture still green over the screen with the color control
set clear down to black and white? If it does, you might
have an issue with the green gun going out or problem in the
circuitry to it.


By the way, the best way to adjust the picture settings on a
tv are to first turn the color control clear down, then adjust
brightness and contrast for best black and white picture, then
bring up the color level to where it should be and adjust the
tint for best red/green ratio.

May 20, 2008 | Mitsubishi CS-27205 TV

1 Answer

Red picture


sounds like u may have a picture tube problem/CRT, would be high price repair

Oct 27, 2007 | Zenith A25B33W 25" TV

1 Answer

Blurry Images


Hello paulaspec,

You have a problem with the three factors, and they are screen voltage, focus voltage, and control (focus 2) voltage. Basically these voltages have to be adjusted since the components in this section have aged some. These controls are usually located in the television on the IHVT (Integrated High Voltage Transformer) or as it is also called the flyback transformer. these controls must be adjusted together, along with the color controls. Here is how the adjustment is done (You will need a schematic diagram, a DC volt meter, and a color bar generator to do these measurments):

 

1) turn color and tint fully counter clockwise until you have a black and white picture.

 

2) connect the color bar generator to the TV (ch 3) and turn it on, you should see bars in various shades of gray

 

3) adjust as best as possible the color and tint controls to obtain the color bars on the screen Red Green Blue.

 

4) measure the voltages on the focus, screen and control grids of the CRT and match them to the schematic digram measurements.

 

5) adjust the focus screen and control grids to match the ones on the schematic diagram

 

6) once this is done then you adjust the color controls once again to obtain the red green and blue bars on the TV screen.

 

This should help if the CRT (picture tube) electron guns are still good and if the flyback transformer voltage supply is working.

 

However if you do not have a background in electronics please take the TV to a shop for repairs.

 

I hope this helps,

Thank you,

Shuttle83

Oct 16, 2007 | Sony KV-20M20 20" TV

1 Answer

Color Turns Green


HI PLEASE ADJUST THE SCREEN CONTROL OF UR TELEVESION SET IT IS INSIDE THE TV..IF U KNOW THE SCREEN CONTROL IN THE SET THAN MAKE IT LITTLE ANTICLOCKWISE.AND THE SET WILL BE OK..

May 13, 2007 | Sharp 27H-S60 TV

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