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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Re: Color problems at top and bottom of screen

Needs new Light Engine. Happened to me twice.

Posted on Jan 14, 2009

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Re: Color problems at top and bottom of screen

Repair Kit for Hitachi convergence Chassis DP-14G
KIT10 Includes 2 pcs STK392-150 , 1 each of the following 1W axial lead fusible resistors:

Posted on Dec 05, 2007

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PT-47wx42 color problems


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..

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

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

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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

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

Apr 18, 2009 | Projection Televisions

2 Answers

Blue Color spots on all pictures

Call a technician, sounds like an Integrated Circuit problem and would cost you about $250.

May 07, 2007 | Philips 60PP9202 60" Rear Projection...

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 me at

Apr 04, 2007 | Samsung HC-P4241W 42" Rear Projection...

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