Question about JVC AV-36330 36" TV

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Brightness problem Changed a new board but the brihtness is low and colour seems to be too much whats the cause

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Adj. sub brightness preset/ or slowly adj. screen pot of e.h.t., before doing this bring all bri, col, con to minimum then adj the screen and sub brightness.

Posted on Jul 17, 2008

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Raster with many colour , sound OK ,low brightness


Degaussing problem. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Apr 24, 2015 | Standard (CRT) Televisions

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Lines on the screen


Hello
If the lines are thin and spreaded allover the screen from top to bottom, and are equally spaced around one inch of so apart, it will be a screen voltage rise problem. You just decrese both brightness, contrast and colour contols of your TV to zero position, and look into, where there is lines are visible on the screen or not. You should notice this in a drak room, so as to see is well, or close all the doors and windows to make the circumstance to a little bit dark.
If you can see these lines still, it is clear evidence of the above said fault. To rectify this fault you should open your TV. Open the back cover of the TV, and you will see a Line Output Transformer. It is otherwse known as LOT. It can be recoganiized easely as it its size. Normally it will look black in colour and a thick wire from it goes the picture tube's final anode, and look like it is stcked to it with the help of a rubber ******. Other two wires from it goes to the picture tube base board. These two wires are, one for focus and the other for screen.
There will be two controls on the lot, which can be varied, and seem to be integrated with LOT. Among, upper one is for focus adjustment, and lower one is for screen adjustment. Both will be marked as "Screen" and "Focus". You just find out the screen control. With the healp of a screw driver it can be adjusted.
Keep the TV on, Brightness, Contrast and colour to minimum, adjust this control to a little [ a very little movement should be done, otherwise the picture will be get blurred], to just eliminate the lines you see on the screen. Focus control and screen controls are interactable, that is adjusting one may effect the other. After eliminating these lines just up the brightness and contrast control to at about their mid position and press the menu button on the TV or remote control to get the menu screen. Look at the letterings, and if it seem to be out of focus only, just adjust the focus contorl to get well focused captions. The adjustments are hot, that is while the TV is operating. Take care. Ok.

Oct 26, 2010 | Mitsubishi CS-40503 TV

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My sony tv KV-19BMR1 color is my problem more blue?


Hello

Advance of any one colour, Red-Green or Blue, will be due to the some fault in the video output section in your Sony TV. When the related colour cathode of the picture tube gest improper voltages, say low voltage than normal it should get, then occures this problem. As you know, all colour TVs have three electron guns, otherwise called as cathodes, are there inside the neck of the picture tube. One emits blue, an other emits green and an other emits red. You are seeing the combinations of these three colours displayed in different ratios in your picture tube when a picture is being viewed. Keep this in mind and follow please.
All the above said three cathodes of the picture tube has some voltages applied to it to emit predetermined quantity of electrons from them, which determines the intensity of that colour. Now your TV displays blue in excess means, the blue cathode of the picture tube in your tv has a low voltage with respect to the other two have. Cathodes are negatively biased, that is as its voltage goes low it will emit more and more electrons, which will cause an abnormal excess colour of that cathode.
You just open your TVs back cover, without damaging any other components inside, after unplughint it from power wall socket. As you open the back cover, you will be first exposed to a small rectangular board, plunged into the neck of the picture tube, known as base card. It is pluged into it with the help of a socket, we call it as picture tube base socket, and it can be pluge out from it by applying a gentle pull backwards. Never make a right or left shake when you do this as it may damage the picture tubes pins or even break it.
Give power to the TV and keep switched it on and see the screen. Keep the colour control to zero position, and brightness to at about 30%, and contrast to 50%. At this condition, you shuld get a clear blacke and white picture. In your case now, you only get a picture with a blue shade. Locate the "blue cutoff control' if any fitted on the base card, [as latest sets have not], and it will be marked as "b-cut" usually. If it is there, with help of a plastic screw driver rate it just a little counter clokwise or clockwise, while observeing the picture, whethere it gets any change in colour or not. If there is no colour change, the colour output transistor related to blue cathode should me changed. It may be leaky.
If there is no color cut-off control is seen, you won't have this option. If so check the voltages of the three above said cathodes, and it can be taken with a multimeter set to 400VDC or above. it should be almost equal th each other, except a voltage difference of 3 to 4vDC is allowable. In your case the blue voltage will be more less than thi tolerence. You can take this voltage by touching the meter probe to pin number "3"_blue, pin number "4'_green and pin number "6"_red. Usually sont tubes have this kind of pin cofugurations. If the blue cathode voltage is seen abnormal with respect to the other two, replace video output transistor related to it. Thsi transistor also can be located in the base card describe earlier. Ok
If you have any doubts and difficulty, inform to Fixya, and they will gvie me alerts.
Keep every precations before opening the back cover. Keep children away from you and never allow them even stand beside you. Let an adult to be beside you while you do this work. Keep the TV pluged out from the wall power socket every time before you touch any of its inside components.
Be confident and patience. If you have some knowledge in electronics, you can do it by yoursef. If not, go for an experienced service personal. I thinks tha you yoursef will do and you can. Ok

Oct 22, 2010 | Sony Standard (CRT) Televisions

1 Answer

Some channels on my tv are dark and tinted orange, I used the menu button to display the menue and scrolled down to picture but I did not know how to select picture.


Hello
Adjust colour control to zero, and check for a pure black/white picture. Adjust contrast and brightness control to minimum and check whether the picture goes completly off or a slight picture prevails. If the picture goes out when you turn down brightness control to 1/3 position, that is about 20 points, your TVs screen voltage is very low, and it can be adjustable. If the picture does not go out and more brightness prevails, screen voltage is high. If the screen voltage is high, there will be some fine lines across the screen at about an inch apart; on the whole screen from top to bottom.
Screen voltage adjustment is critical for the clarity of the picture. If it is low, no proper colour will be dispayed. If it is high, it is harmful to both picture tube and your eyes.
Never try to adjust it without proper knowledge about it. The screen control can be located alongwith the LOT [Line Output Transformer], of your tv. There will have two adjustable controls there, one is for Focus, and the other is for Screen. Both are interactive, that is adjusting one will effect an other.

Oct 18, 2010 | Emerson TS2587D 25" TV

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Set shuts off expecially if a commercial comes on or the scene is a dark one. will restart but sometimes it takes three or four times. the longer the set is on the more it will happen


This may be caused by a faulty or a badly soldered low voltage regulator.

You need to find a test point for the low voltage named "B+" and check if it is stable when the brightness goes down (dark commercial, channel change, brightness change).

If the "B+" voltage is not constant, this means that the part that regulates it (a regulator IC or associated components) is probably faulty or may be loosely soldered to the circuit board (loose solder joints may often cause such problems since the loose contact on the pins of a component becomes even worse when a component heats up.

It is not a bad thing to have a detailed schematic of the set - it will save you time when you search for the test points and components which need to be inspected.

regards

Triarcuate

Oct 01, 2009 | Sony FD Trinitron WEGA KV-36HS420 36" TV

1 Answer

Brightness and coular


its a personal preferance the best way is select factory default settings as a start then turn all your colour off & get the best black & white picture you can take a flick around the channels so that you don't just set to one picture as the bbc don't do a test card anymore when your happy add colour to suit you taste most tvs have a memory for your personal taste select if applicable hope this helps

Jan 02, 2009 | Toshiba 36AF41 36" TV

1 Answer

KV-32FQ75E colour loss


Go to the Sony website and check out the correct antenna cable and scart lead configuration for your set up. I did and with a few simple connection changes it was like getting a new TV.

Jan 07, 2008 | Sony FD Trinitron WEGA KV-32FQ70 32" TV

1 Answer

Philips tv


you probably need a hotel master remote, i.e. the philips rc2573gr:

http://salestores.com/philipsr.html

Oct 17, 2007 | Philips 36PT41B TV

1 Answer

Picture Would Come In and Out, Now Not at All


It seems as though from your description it is just the brightness changing. The Cathode Ray Tube has three electron guns at the back end. These are for green, blue, and red. Each gun has a cathode and a grid. Nearly all control the brightness by having the grids tied to a variable voltage. And nearly all control the colour and luminance by an amplifier connected to each cathode. As you do not say the colours change the the amlifiers are OK. I would suggest the voltage to the grids ( or cathodes in some), is unstable due to a bad connection or a dry joint, or a faulty resistor in that part of the circuit. Very old sets without remote control used a potentiometer to vary the brightness. A voltmeter is all that is needed. When the picture goes off try holding the increase brightness for some time, to see if it reappears.

Oct 28, 2006 | Panasonic CT-36D32 36" TV

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