Question about Sony WEGA KD-34XBR970 34" TV

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Sony LCD cutting off image when hi-def cable hooked up.

I cant turn my 36" Sony Wega LCD flat screen tv -wide mode- to "normal", it is shaded and not available, I can only select "wide zoom", "full", "zoom", and when I have hi-def hooked up and go to a normal(non hi-def) tv channel, it cuts a small part of the image off, like maybe 10%. So the only way I have found to fix this is to unhook the hi-def cables and use regular yellow rca plug.

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  • shelbyzz Nov 25, 2008

    Well, maybe I found the problem - my cable box was set to partial zoom. but still why cant I select "normal" on my "wide mode" setting?



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  • Sony Master
  • 12,962 Answers

This will happen invariably. Depends on the nature of the signal that is being received. Some will fill entire screen, others will not.

Just go with the flow - tv is operating normally.

Posted on Aug 23, 2017


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Posted on Jan 02, 2017

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SOURCE: How do I replace the TV tube in my Sony Wega 36" flat screen?

Hello jmdady,

First I would like to say that this procedure is dangerous, and should only be done by a qualified Television Technician.

With that being said here is how I would do it:

1) unplug TV and remove the back panel of the TV set.

2) discharge the anode voltage of the CRT by using a screwdriver attached to a clip lead which is attached to the ground of the TV.

3) Remove the chassis of the TV as per the instructions found in the service data (you will need to buy the schematic diagram and the service data sheets for this set)

4) with the chassis removed and the HV anode removed from the CRT, lay the TV face down on a soft surface (a folded towel or a large foam pad).

5) Remove the yoke transformer and the convergence rings by releasing the holder ring and slowly moving the assembly up on the neck of the CRT until the whole assembly is free.

6) Unscrew the 4 retaining brackets and remove the retaining assembly from around the tube (this includes the grounding straps

7) Once the retaining assembly is removed, pick the tube up by the sides (DO NOT USE THE NECK OF THE TUBE TO LIFT THE TUBE UP).

8) Once the old tube is out, put the new tube in its place.

9) Reinstall the retaining brackets and the grounding strap and screw the assembly back in place.

10) put the yoke transformer back on to the set, using the same spacers and mounting equipment but do not tighten the holder ring (you will need the yoke and color rings to the loose to adjust purity and convergence)

11) Reinstall the chassis as per the schematic, reconnect the HV anode, the CRT board, and the connections to the Yoke Transformer

12) At this point you will need a color pattern/bar generator, a mirror, and a lot of patience because you will need to adjust the yoke on the TV and adjust color purity, and convergence (Read the schematic as to the recommended signal levels, and patterns to use).

This is the procedure I would use. Now I suggest that you have a qualified TV technician do this because there are certain dangers involved in this procedure. THIS IS NOT SOMETHING YOU SHOULD TRY TO DO YOURSELF.

I hope this helps,

Thank you,



Posted on Dec 07, 2008

  • 1689 Answers

SOURCE: Sony 36 Wega XBR Flat Screen - sudden death.

This could be a scan amplifier failure, and there is a loss of high voltage to the CRT. Part of the power supply may have also failed. In these sets, if the CRT emission goes low in emission, or the CRT goes defective, the bias supply to the CRT will go in to protect.

An experienced TV service tech can troubleshoot the set and give you an estimate for service. Considering the age of the set, the cost of service may not be worth it.

Jerry G.

Posted on Jan 08, 2009

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