Question about JVC AV-27430 27" TV

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JVC AV27430 picture seems to have lost the red color

The picture is very dark and seems like there are no reds and I tried to adjust the focus and brightness at the back of the set and with the remote

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Hi, good day.

Pls check for loose contacts along the crt circuit and likewise, the possibility of a defective crt socket

mycho

Posted on Feb 15, 2009

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I have a JVC model AV27320 standard TV. The picture is dark and the tint is off. The colors you can see are blue and red. Tried adjusting tint and brightness from the menu and no significant change. ...


It is one of two things the picture tube is bad and the green emission is very low or the green gun is open, the second possibility is the video driver or output is shorted on the video board "plugged in the back of the picture tube"

Mar 03, 2011 | JVC Standard (CRT) Televisions

1 Answer

Picture seems sunk in and the color distorted with doubleing effe


Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.

This is a very common failure on these projection sets and a fairly simple DIY fix. All projeciton sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.

Common Symptoms include....
  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.
  • TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Here are some photos of convergence problems.

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Here is a quick test....

Using your original remote go-to the settings menu then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move RED and BLUE in all directions - up, down, left, and right. And you should be able to get the grid straight.

If you can't move them in all directions or cant move them far enough your convergence chips are bad and should be replaced. This is a common problem.

Note: If you TV has as flash focus or magic focus button only try pressing the button. If it fails to fix the convergence your need to fix it. See below for a fix

69189a5.pngCONVERGENCE SOLUTION

You will need to replace the convergence chips and possibly some convergence resistors and pico fuses.
This is a a fairly easy DIY job if you are handy and can follow directions. You can get complete repair kits from TvRepairKits.com or click here. They have put together DIY repair kits that include the OEM parts and step by step photo instructions for each repair. If you are not handy or can't follow directions we would suggest calling a shop.

Jun 01, 2010 | RCA HD52W58 52" TV

1 Answer

Hi. I have a JVC tv model AV27430, and the picture is often too dark to be able to see the show. I've adjusted the brightness from the Menu to no avail. A repair person said that there is a brightness...


What he was refering to is called the "FLYBACK"

It is a voltage regulation circuit that has 2 controls, 1 for brightness or "GAMMA" and one for focus.

WARNING:: TV'S HAVE HIGH VOLTAGE THAT CAN KILL YOU

To locate your flyback simply remove the back from your tv and look at the main tube, off the main tube will be a cord that looks like it comes from the top inside of the tube and goes down to a circuit board, that is the flyback, and if you look on it it should have 2 turn knobs or potentiometers , some manufactures glue these in place but the glue is easily removed. 1 of the 2 is the brightness, it's eisier to put a mirror up so you can see what your doing other than ask someone to tell you.

This is a picture of a flyback outside of the TV
http://www.fixya.com/uploads/images/767D93D.jpg

Sep 23, 2009 | JVC Standard (CRT) Televisions

1 Answer

Dark picture, mostly red colors


if you set is over 4 yrs old the tube is at fault,you may try to adjust the screen settings.

Mar 27, 2008 | Zenith B25A76R 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

Dark and red picture


First you can up the screen voltage, by finding the HV transformer. It has Screen and Focus control on it this it the Transformer that is in back of set and has an anode lead going to Picture tube. Come up on the screen control slowly and if the picture brightens with vertical lines then it's too high, The red problem is a small transistor that maybe located on the CRT board. It's probably shorted. There are about 3, each going to the different colors Red, Blue, Green.

Sep 13, 2007 | RCA F35317 35" TV

3 Answers

Picture color


have JVC AV-32F702 TV. It's picture color is very red. unable to adjust colors through menu. Channel numbers are also in red now instead of normal green. any suggestion? please check red color cathode circuit 1 check red output from ic to red cathode ckt 2 check voltage on r output ckt& ic or tr. 3 check loose contact in red cathode ckt 4 check crt base for loose. 5 loose connector 6 chroma ic thanks

Sep 09, 2007 | JVC AV-32F702 32" TV

1 Answer

Brightness of picture


If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.

Aug 21, 2007 | JVC AV-27D104 27" TV

1 Answer

Error with red color


i've never had to fix this problem before, but give this a try, it might work. remove the front bottom panel of the tv, their should be 2 to 4 screws then the panel should come off. it might need a little prying & sometimes they use velcro to hold it in place along with the screws. now remove the small plastic or wodden panel, another 2 to 4 screws. now in the upper right side you will find the screen/focus block ( 6 controls). i think the top 3 are screen & the bottom 3 are focus. you will need to adjust the screen control., use a flashlight to read it. now the center is the green tube, i do not remember if the red is to the right of left. the screen control is like the master brightness, which sould help with the low sensor output. if you turn up the red too high you will get small red lines on dark picture/or in a dark room. good luck.

Dec 27, 2006 | Sony KP61XBR200 TV

2 Answers

Dark picture (HELP)


Open up the back of the set but be very carefull. Notice a large black block with a large red wire that runs up to the picture tube. on one side of that large block where the thick red wire is comming out of are two controls, one should be marked focus or F and one should be marked screen or S. With the set operating normally and not touching anything else, slowly turn the control marked screen or S clockwish till the picture gets bright enough. If you go too bright the set will shut down or you see small thin white lines so back down on the control. then touch up the focus and your good to go. good Luck.

Dec 01, 2006 | Toshiba 32A42 32" TV

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