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panasonic pd50 buzzing is this normal

Discussion in 'Televisions' started by tim allen, Jan 29, 2005.

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  1. tim allen

    tim allen
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    just got it yesterday but their is a buzzing noise comming from thr back not the speekers you can hear it when a program is not that loud is this normal :)
     
  2. Simcom

    Simcom
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    High Tim,
    I got the Panasonic TX36PD50C this week and yes it does buzz quietly at the back. I have read about this before and apparently it's quite common on 100HZ sets.
    I have a small Geometery problem (straight lines curve in the corners) but I have an engineer coming on Thursday to try and correct this in the Service menu. Do you have this problem?
    Also the Virtual Dolby is supposed to work when you receive a Dolby Signal. However, I have played various DVD's but can tell no difference in the sound when I switch the Dolby setting ON or OFF. Can you or anyone confirm if their set is the same.
    Feel free to post any other issues as it's good to compare little niggles just for peace of mind.
     
  3. tim allen

    tim allen
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    cant tell the differance in sound
    doese your curves only show themselves when you have bars each side ie a 4:3 picture at the bottom left and right
    thanks for the reply also doese the buzzing anoy you
     
  4. Simcom

    Simcom
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    Yes you can see the curves in 4:3 / 14:9 on the picture edges but if you are watching a full screen and a door frame or picture frame etc. appears near the corners of the screen then the curve is also noticable.

    I sit 12ft away from the telly so the buzzing does not bother me. Only really notice from that distance if on a very low sound setting.

    As far as the Dolby sound goes, are you saying you have played Dolby Digital DVD's and there is no difference in the sound when you flick between on and off.
    I can't understand why they have this as an option if it does not do anything.
     
  5. tim allen

    tim allen
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    my dvd player has 3d spacialiser sound option and it doesent do a thing
    please keep me posted about what the enginerr says please could you ask him about the buzzing thanks
    i will be watching a film tonite so will post back tomorrow
    cheers
     
  6. spocktra

    spocktra
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    Had an engineer to look at my first tv(pd30) for the same problem.He said it was the proccesser buzzing.I found this too loud and returned the set.
     
  7. tim allen

    tim allen
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    watched a film last night and the buzzing drove me mad also when using rgb on dark senes you got horizontal bars going across which i thought made people seem to shimmer dident happen when using s video on the fron panel
    anybodyelse get this
     
  8. extechieman

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    Had my PD50 for a couple of days now. It doesn't suffer from any buzzing sound that I can tell, nor does the virtual dolby appear to do anything (unlike my previous PD30 where the virtual dolby was quite impressive). Picture quality is an improvement on the PD30, with fewer digital problems. Have yet to set it up with my calibration disk so perhaps I can tease out a few improvements to colour balance/contrast/geometry.
     
  9. Simcom

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    If you put your head next to back of the TV on the left hand side as you look at it then you will hear the buzzing. At least you can on mine. Tim's sounds worse though. Let me know if you can here it. I will mention it to the engineer on Thursday when he comes to look at my geometery problems.
     
  10. tim allen

    tim allen
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    yes i sit about 7 foot away and just watched king of the hill dvd and could hear the buzzing on most of the prog will ring them on monday :)
     
  11. daver555

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    I noticed a slight buzzing when I first got my PD50 but after moving my digital land-line phone away from the set it stopped almost completely. Now I've had the set for a couple of months and it's either stopped buzzing or I've gotten used to it and dont notice it anymore.

    I have noticed the vertical lines turn in at the top of the screen slightly which is more annoying.

    FAO Extechieman, you mention a calibration disc, where can I get hold of one of these?
     
  12. Jimbo22

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    Had mine for a week now and haven't noticed any buzzing. I'll have a listen tonight.

    I've got component input on the DVD and the picture is awesome although I would also be intersted in a calibration disk. Also noticed even with the contrast turned right up the blacks are very black and you do tend to lose some of the detail on very dark pictures? Anyone else have this problem?

    Virtual Dolby sounds no different to me either
     
  13. extechieman

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    Listened very closely today for buzzing, but couldn,t notice anything. Mind you, wifey says I'm deaf anyway! Daver555, the disk I mentioned is from DVE (link below). They supply both PAL and NTSC calibration disks to help set up colour balance, contrast, brightnes, etc, as well as surround sound speaker systems. Quite useful, although a little pricey.
    Only problem with my 32PD50 so far is the virtual dolby setting makes no noticeable difference. Think I'll ring the shop and ask why.
    http://store.yahoo.com/dvdinternational/dve.html
     
  14. Simcom

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    Yep I'm a bit annoyed that the Virtual Dolby does nothing. Please let me know if anyone finds out why. Maybe it's a design fault that Panasonic could put right.
    I have also noticed with my 36" PD50 that even with the contrast / brightness turned up the blacks are very black and you do tend to lose some of the detail on very dark pictures? Has anyone got a fix for this in the Service Menu?
     
  15. Simcom

    Simcom
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    Oh forgot to ask, has anyone else noticed a slight difference in shade on the right hand side of the screen. Sort of a band that runs from top to bottom which is only really noticable with white pictures. Am I expecting to much of a large screen.
    Red16V probably knows the answer to this. Is it difficult to get consistant shading right to the edge of a 36" tube.
     
  16. Simcom

    Simcom
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    Just got in from work and noticed how bright my screen is when I first turn it on.
    It takes 4 or 5 minutes for it to settle down to a normal picture.
    Is this another design feature of the 36" PD50?
    Let me know please.
     
  17. extechieman

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    Phoned shop today to report virtual dolby faulty. They are coming with a replacement set later this week, so I'll let you know if it's any better.
     
  18. gzcunnin

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    Agree with other posts - no difference to sound on PD50 32" with dolby on. Interested in any feedback obtained from Panasonic.
     
  19. Zaichik

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    I have another Panny set with Virtual Dolby and I can't hear any difference with the Dolby on - other than the sound is quieter overall.
     
  20. Simcom

    Simcom
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    Anyone noticed yet whether their picture is very bright on the PD50 for a few minutes after first switching it on?
     
  21. kenp

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    Got 36PD50 yesterday.
    Yes its got the buzz.
    Also can't hear any difference with virtual dolby.
    Out of the box PQ does seem bright and technicolourish.
    Maybe needs burn-in time like audio?
    Interested to know what picture settings preferred.
     
  22. Simcom

    Simcom
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    Once you adjust your brightness, contrast, colour etc the picture will look fine.
    The problem I have is when you first switch the set on from cold every day the screen is very bright. (Like you have the brightness turned up too high)
    After 4 - 5 minutes it then settles down. Does yours do this?
    Keep posting good / bad points. I love comparing.
    I still have the engineer coming Thursday to sort out the Geometery. Vertical lines still seem to bow in the corners.
     
  23. tim allen

    tim allen
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    got an engineer comming round on tuesday to look at the buzz and the bowing in the corners is anoying me now aswell as the horizontal white lines on black pictures in rgb mode using the cinema setting try it using end credits with a black background
    i am looking for a replasement dont want a new tv that has had to have work done on it hope it all works out
     
  24. shooi

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    Is that a Panasonic engineer you've got coming out? I contacted support at digitaldirectuk.com (where I bought the TV from), and they said that this is completely normal for widescreen TVs, they get hundreds of calls about it, and there's nothing they can/are willing to do about it.

    Regarding the virtual dolby, I don't notice much difference either, but every now and again the odd sound seems to pop out from somewhere in the room where I don't have a speaker. I just put it down to the fact that my TV's stuffed into the corner of the room with a bay window on one side and furniture on the other. I guess there's no real substitute for a 'proper' surround sound setup...

    Oh, and so not to be off topic :nono: I do get a buzzing noise too, but very quiet - not noticable at more than 2-3 feet away.
     
  25. Simcom

    Simcom
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    The engineer I have coming is from a local outfit that House of Fraser use.
    Most people on this Forum seem to think you an improve the bending vertical line problem through the service menu.
    I'll see what the engineer has to say tomorrow.
    Any one got any comments on the high brightness level when swtched on from cold or noticed that white screens appear slightly dimmer on the far right.
     
  26. tim allen

    tim allen
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    simcom cant say i see the different brightness also can you remember to ask :) about the buzzing thanks
     
  27. shooi

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    I had a quick look at that service menu - didn't understand it.

    I got a reply from Panasonic about the geometry, by the way - here's the official line:

    "This phenomenon is referred to as Geometry and is, unfortunately, a limitation of domestic cathode ray tube technology.
    The method employed to create a picture on the inside screen of the tube involves electronic circuitry to ensure the “beam speed” is adjusted at the corners and sides so that the picture is as square as possible.
    Regrettably this cannot be made 100% true, without significantly increasing production costs. Such increases would, inevitably, impact on the final purchase price to the customer. You may therefore see geometric imperfections to a greater or lesser degree on all Televisions and these can be particularly evident on Widescreen models.
    However, whilst this cannot be entirely eliminated, there are adjustments that can be made, using the Geomagnetic correction feature, which can be found in your manual in the Quick Start guide. Alternatively it can be carried out by an engineer. If other televisions you have seen of the same model number have not shown the same level of “bending”, it is possible that this same adjustment can be made on your unit.
    I would recommend, therefore, that you discuss the matter further with your retailer and, if necessary, ask that they contact our own technical support department for advice on the correct adjustment procedure. Alternatively, a service agent in your area would be able to assist. Details of those in your area can be found on our website, www.panasonic.co.uk, under 'Customer Support' and 'Find a Service Centre'. However, please be aware that an agent other than your retailer may charge a handling fee.
    I trust that the above advice will be of assistance to you and that your retailer may now place your television into a satisfactory viewing condition for you, enabling you to obtain optimum performance from the same.
    "​
    So they've washed their hands of any responsibility. I'd be interested to hear from anyone who's messed about with the geometry themselves, and whether they'd recommend a 'novice' having a pop at it - :oops:
     
  28. Simcom

    Simcom
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    Engineer just been. Said he could do nothing about the geometery. Said all Widesceen TV's suffer from it to some extend, the larger ones being worse.
    Was prepared to take it to the workshop for testing and adjustment if possible but no guarantees. Suggested I could try another set because that may be a bit better but does not think you will ever get one that are perfect. In his words 'Tubes are not as good as they used to be'
    Well I think mine is particularly bad and why say you can do nothing and then offer to take it away. Either it's fixable or it's not.
    When asked about it being very bright at startup for 5 minutes he look startled but then said 15% increase for a few minutes was normal.
    Asked about the darker tint on the right of the screen especially when viewing light pictures. He said they changed one customers tube 3 times and the problem remained. He reckons Panasonic said it was normal.
    Asked about the buzzing. He said it is the Scan Coil and it's normal.
    Asked about the Virtual Dolby. He did not seem to know much about it.
    Spoke to a mate who has a Sanyo and he said his Virtual Dolby alsodoes nothing. What's the point of it then???
    The engineer did say all TV manufacters have their problems but when I asked him about Toshiba he said he had not seen many of them. WELL THATS GOT TO BE GOOD HASN'T IT!!!!
    So everything is normal!!!!!!!! I don't think so. I paid a lot of money and I expect a quality fault free product.
    Like has been said many times, you just have to keep going until you get a good one.
    Well I'm off to ring House of Fraser for a replacement if only for piece of mind.
    Maybe Panasonic will start to adjust these TV's better on the production line if we keep sending them back.
    I'll keep you all up to date as and when things happen.
     
  29. tim allen

    tim allen
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    thanks for the feed back sounds like mine will be going back if he comes up with rubbish like buzzing is normal we have a 28" beko at work with no buzzing atall
     
  30. PUD the Ancient

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    I have a 32pd50, no buzzing, good geometry, excellent with sky, consoles and dvd. Do have interference lines on dark back grounds but only if brightness is set to high, so not really a problem under normal circumstances. Only other problem is slight grid effect down right side of screen about an inch wide, only really noticeable on dvd if you stand up close to the tv. Cannot see it at normal viewing distance but stll might change it.


    SETTINGS

    100hz plus

    contrast 54
    brightness 42
    colour 38
    sharp 1
     

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