Question about Toshiba 42H83 42" Rear Projection HDTV-Ready Television

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42h83 have horiz jitter in video on tuner and video inputs. Menu screens are stable, also without and signal hooked up to the tuner the raster is stable problem seems to be around pd 2275. Any help would really be appreciated

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Re: 42h83

This tv needs to have the scan convertor module replaced or the caps replaced in the current module some h81 82 chassis scan convertors are still available they can be 100-300 dollars depending you may be able to get it rebuilt

Posted on Dec 09, 2006

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Zenith R56W36 Screen rolls constantly with cable hooked to antenna input; works fine on all video inputs

Tuner or a sync problem----using the video inputs bypasses the tuner and front end of the set's signal circuits---consider using a box with audio and video outs to a rear input and bypass the problem.

Jun 10, 2012 | Zenith R56W36 56" Rear Projection...

2 Answers

No Picture


Let us try eliminating the video process by connecting an external video source such as a DVD player in any of the Audio/Video INputs. Doing so would confirm the tuner (and/or perhaps the logic) circuitry.

Most TV tuners would use a 33 volts reference voltage for the VCO to shift frequencies. The 33 is normally regulated by a dropping resistor and zener combo. Pls check this as they could be the issue. It may be to your advantage if you could post the brand and model of the PTV or at least the tuner block.

This is of course assuming that you are familiar with electronic circuitry and components, use of a DVM and safe practices involve when performing voltage checks on a live unit.

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

Good luck and kind regards. Thank you for using FixYa.

Oct 16, 2008 | Projection Televisions

1 Answer

I have a model av48p776 jvc I am getting jitter lines across the screen more often than not and the bright comes and goes what do I need to do to fix it I would hate to get rid of the TV I just bought it

JVC AV48P776 Jitter and Brightness Varies

Check for convergence failure. Convergence Gallery Try adjusting convergence in user menu. If convergence display is messed up or adjustments do not work correctly, you have an Intermittent short circuit within an STK IC.

Look at menu screen with an unused input (antenna or video). If menu is stable and clear, TV may be OK and you may have a signal input problem.

If it is not poor quality input signal or convergence problem, someone has to troubleshoot to determine if it is a Video, Processing, Power supply or CRT related problem.

Most likely convergence.


Feb 28, 2010 | JVC AV48P777 Television

1 Answer

My rca has no picture the screen has a snowy picture is if it was on the wrong channel through my cable box.

More information would help. What are you running the signal into the TV with? Coax? Separate video/audio? To test the set if you have a vcr hooked up or available to hook up, input it into the tuner input and play a tape. Set the tv to either channel 3 or 4 (whichever channel the output of the vcr is set for, this can be determined by checking the menu or a switch on the back if it is an older vcr). If your TV is ok you should be able to see the tape which is playing. If not, and you still have snow you probably need a new tuner in the set. Let me know if you need more help.


Feb 05, 2010 | RCA P61939 61" Rear Projection Television

1 Answer

Unstable signal on a SONY KDF-50E2000 08760591

Can you please explain what you mean by an unstable signal? Without details, the problem can be anything from a weak signal being presented to the tuner to a defective tuner to poor signal processing later on. Also, check the picture and sound using different inputs to the set. If hte problem is the same regardless of hte input signal, that tells us that the problem is in the video signal processing circuitry. Also, place a menu on the screen. Is the instability present with the menu display?


Nov 04, 2009 | Sony KDF-50E2000 50" HDTV

1 Answer

My RCA 52in. has a blue screen... Will not show a picture?

  1. Check menu to make sure a signal is present. try video 1 with a external video source such as a VCR. If this produces a picture check for tuner signal by hooking the VCR to the antenna and tuning to channel 3 or 4. If their is no picture check antenna connector on back of set for looseness. If loose resolder antenna connector in tuner. If all these test fail the tuner may be defective and will require replacement.

Oct 14, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

Mistubishi Convergence/video display problem

also check resistor values on the chips and resolder the tuner as this can cause problems as they heat up , then replace any electrolitic capacitors in the video circuts selector ic
i will be back to see what you get


Oct 26, 2008 | Mitsubishi WS-55809 55" Rear Projection...

1 Answer

When there?s any bright white light, the unit just loses the signal .

Good Day, littlejhon4u;
Try this and/or try using different input: White raster with no signal, washed out looking video with signal. Access the service menu, "menu 0157" use the audio button to select "video chroma" adjustments, use the video button to select item "68 - AG1", use the adjust button to change the setting to 0, then press the enter button to store the change. Good Luck, big IRISH. PS; Adjust this ONLY.

Aug 29, 2008 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer


It may be a problem in the tuner. And I think this model has two tuners (one for each input). You may want to try switching the signal from the 'A' input to the 'B' input (and select that input from the on screen menu also) and see if you still have the same problem. If you have a cable or satellite box hooked to the input then it is possible that is where the fault lies. If the problem clears up by switching the tuner, I would just leave it go and hope it lasts until you upgrade to HDTV.

Mar 12, 2007 | Mitsubishi VS-50603 50" Rear Projection...

2 Answers

Picture is snowy on every channel. I hooked up my playstation and set it to the correct channel but the screen display is the same. I tried using the menu and the menu comes up just fine. The menu goes on...

If one tv looks good and another one dosent look good or operate correctly then we know for sure that the problem is not the antenna. Now the menu comes up ok because the menu is injected after the tuner into the video curcuit from a osd or microprocessor. sounds like you could have a defective tuner or antenna block assy.

Mar 27, 2006 | Toshiba 42H83 42" Rear Projection...

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