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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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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Posted on Jan 02, 2017

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HDMI input works ok. Hooked up external antenna. Did channel scan. It will only scan for analog channels. Has analog raster on screen. It has no information on menu page for digital channel scan.
do you have the air option in the scan menu see
http://tv.manualsonline.com/manuals/mfg/sanyo/dp42841.html
page 9 important fact cable digital gets wiped by air digital channels

You may be able to get around this via a digital hd tv decoder box and then have it on a hdmi input on the TV as a backup to the cable if you can't have both cable digital channels stored and aerial digital channels stored

Oct 09, 2016 | Sanyo DP42841 42" LCD TV 1920x1080,...

2 Answers

No Picture
Hi,

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 | Televison & Video

1 Answer

My element electronics tv says no signal
Two things to try:

1. Connect a DVD or something else to one of the rear audio/video inputs to see if set works that way.

2. Check to make sure set in menu is set to tuner and cable---if the tuner in the set is bad a cable box with audio/video outs on the back can be hooked to one of the rear audio/video inputs and will bypass the tv tuner--you will stay that input to watch TV and change channels with the box----

The cost of renting a box is minor compared to having to replace the tuner in the set.

Mar 24, 2012 | Element Electronics Televison & Video

1 Answer

When I turned on the tv this morning it only had audio no video. Their was no menu or screen saver when I pressed the menu or input buttons it looks as if the tv is off but I can hear the audio fine. What...
Tv now turn on,have a flashes of screen backlight,have picture only a few sec. and dies and have audio left only?This problems alway tv are having dead 1 or 2 long LCD inverter boards.These 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards job are to help the LCD screen panel have a backlight to produced a picture.Tries tv turn on and off a few time,if tv get a stable picture and work,than have a dying tv Tuner signal board,that the board where the incomming broadcasting signal cable plug into it the problems.Instead of those 1 or 2 long LCD inverter baords.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbihes 1 or 2 long LCD inverter boards and also tv Tuner board.

Feb 16, 2011 | Televison & Video

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.

easyab

Feb 28, 2010 | JVC AV48P777 Television

1 Answer

I have hooked up the input jacks but the screen only shows the menu but no picture of channels
what are you hooking into it? there's no tuner in this unit. if it's just straight video, reset the settings in the menu to factory default and select the video input.

Dec 11, 2009 | InFocus Proxima UltraLight LS1 Multimedia...

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?

Thanks,
Dan

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

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

electech

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

1 Answer

Blue Screen
Hello,
I just wanted to suggest some things for you to try, if you have not done them already. Try hooking up a known good signal, such as the main input cable from your cable or dish, hook it straight to your tv, and see if you can change channels, and get a picture on low band...2 thru 6, and then if not, how about any picture above channel 6, if you get picture on 2 thru 13 now, it could be whatever you have hooked in between the input cable and the tv...be sure you have the tv on the right channel for your receiver, usually 3 or 4, or if you are using another type of video input cable, make sure you have tv on the right input for that cable and that cable is good...check the in and out of your component unit, for correct cable hookup as well as your cables, in reference to using RCA video and audio left and right in and out...a lot of sets and vcr's will go to a blue screen if they lose signal to them....I hope this helps you out some.If you cannot get a picture from hooking your signal straight to your tv, it could be the tuner got a spike from a thunderstorm, or has lost the B Plus source for the tuner circuit. Be sure that it is not selected for an input signal,other than the cable or antenna mode, the onscreen text should verify this, if you can change channels with or without getting video...a picture....Good luck with it. T.

Jan 15, 2008 | JVC AV-27S33 27" TV

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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HDMI input works ok. Hooked up external antenna. Did channel scan. It will only scan for analog channels. Has analog raster on screen. It has no information on menu page for digital channel scan.

  • Sanyo DP42841 42" LCD TV 1920x1080, 4000:1, 60 Hz, HDTV, LED Backlight

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