Question about Hitachi 42V715 Rear Projection Television

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Color problems at top and bottom of screen

The picture is great except for blue shading across the bottom 2-3 inches of the screen and yellow shading across the top 2-3 inches of the screen. I tried adjusting the picture color, sharpness, brightness, tint, etc. with no change. The set is nearly 2 years old (purchased Jan 2005). I can try replacing the lamp but wondering if this will really solve anything.

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  • Anonymous Sep 08, 2008

    Started with yellow circle in center of screen (42" TV). Now have yellow streaks throughout picture area. any ideas???

  • Anonymous Mar 23, 2009

    Same here. I bought an extended warranty m 2005. It covered the first one and it took more then two hours to replace the engine. This second time is a yellow circle, will call the warranty company again.

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Repair Kit for Hitachi convergence Chassis DP-14G
KIT10 Includes 2 pcs STK392-150 , 1 each of the following 1W axial lead fusible resistors:
http://www.eserviceinfo.com/
http://www.digitalhome.ca/forum/search.php
http://www.digitalhome.ca/forum/showpost.php?p=564268&postcount=220
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Posted on Dec 05, 2007

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1 Answer

Panasonic plasma tv th42px8ob 2 inche vertical line showing


do the proper isolation proceedure and try unhooking the Su from the SC board to see if you then get a normal picture all the way across the bottom half of the screen? I am assuming the Vertcal extends extends all the way from top to the bottom of the screen?

Aug 06, 2012 | Panasonic Televison & Video

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PT-47wx42 color problems


Hi,

This could be a heater-cathode (H-K) short in the CRT, a failure of a component in the chroma circuits or video output (driver board), or bad connections there or elsewhere. Don't panic - heater-cathode shorts in CRTs can often be worked around.
Note: before proceeding, it is a good idea to make sure that the screen is degaussed - else you could be attempting to track down problems with the wrong color!
Some simple tests can confirm or rule out other possibilities.

  • Compare the voltages for the video drive signals to the CRT on the little board on the neck of the CRT with the CRT both connected and unplugged. A schematic will help greatly in locating these signals.
    • If there is a significant difference especially on the bad color, then the CRT is a likely candidate. Try tapping the neck of the CRT GENTLY (with it plugged in and while viewing a picture) to see if it is an intermittent problem.
    • If there is no significant difference, you may have a bad driver or a problem in the chroma circuits.

  • Look for bad connection/cold solder joints, probably on the little board on the neck of the CRT. Use an insulated stick to gently prod the board and its components in an effort to induce/cure the problem. Look carefully for hairline cracks around the component leads.
  • You can swap components between two colors and/or test with an ohmmeter on that driver board to determine what is bad. The nice thing about color monitors and TVs is that there three copies of each of these components. Swapping and/or comparisons between these is an excellent diagnostic technique.
  • Another simple test: Disconnect the cathode for the full-on color from its drive. If it is still full-on, there is probably an H-K short in the CRT since the only way to get each color on the screen is via the cathode connection to the CRT neck board. If it is removed and there is still that color, the current must be taking another path inside the CRT.
  • Alternatively, interchange the outputs of the bad color with a good one by jumpering on the video driver board (on the CRT neck). If the bad color changes, then the problem is in the circuitry and not the CRT.
So you have to get a tech if the above method doesn't solve your problem and get it fixed..

Goodluck,
Please don't forget tor ate me as fixya..

Feb 09, 2008 | Panasonic PT-47WX42 47" Rear Projection...

2 Answers

I have some distored blue color across the screen


Projection sets have two very common problems.

The first common problem is convergence


These sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the picture to look normal. This is called convergence.

When its out of alignment the video will look 3-D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired. Convergence problems are very common on all Projection TV sets including Sony, Samsung,JVC,Philip Magnavox,Panasonic,Akai,Pioneer, Hitachi,Mitsubishi,Zenith and others.
You can get more information and a DIY convergenece repair kit with instructions from the link below.

Here are some of the most common problems with these sets...

*Screen Looks 3-D
*Colors wont align
*Screen may look distorted or warped
*No Audio/Video - TV Shuts down - May also make a constant chirping sound

Problem #2 - Another common problem is dull or washed out video.

Your set may have one or more of the following symptoms....

*Dull looking picture
*White looking picture
*Halos around objects
*Red/Orange looking picture

bb0cf99.pngYou can see some more examples and find a fix using this link on Fixya http://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

May 15, 2010 | Panasonic PT-53TW53 53" Rear Projection...

1 Answer

Red line across top/blue line across bottom of screen


Adjust your convergence. Under menu I think its the last choice at the bottom of settings or picture menu

May 05, 2009 | Sony KDF-50E2000 50" HDTV

1 Answer

3 inch red area at top of screen and smaller blue area at bottom of screen


this would need a optical block. there would be no other way to solve this issue

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2 Answers

Dell 3100cn


I've the same problem with a 3000cn but on the black color. all other colors are great execpt the black one.

Any Ideas someone ?

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1 Answer

Red, green, and blue rectangular "chads" or squares across top of screen


Hi there, this is easy thing to fix. Its LDV cable. This is the Cable which goes from the main board on to the screen. Un plug the cable from the screen side., then push the cable back. Make sure cable sits in .

This will sort all the problems with the picture,i.e colour problem , picutre squring up and many more things.


Regards Sam

Sep 28, 2007 | Toshiba 42HP84 42 in. Plasma HDTV

1 Answer

Blue haze around image, yellow streak


the tv color circuit is off frequency change the color ic take a look on the crystal that gives the 4.8.mhz burst could be that it needs to be replace dont rule out the video IF change the two ICs you mention.good luck.from the look of your tv screen that is my conclusion.good luck.email me at nicodhem@yahoo.com

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