Pioneer SD-P50A5-K 50" Rear Projection Television Logo

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Anonymous Posted on Apr 14, 2007

SD-P5191 Pioneer control inputs lock after startup

Unit will start and if you immediatly change channel, mute, etc. it will take one input and no more. A string of random characters stay all across the bottom screen where the volume level display should be shown. I would like to locate a schematic or any other help. Thanks

  • Anonymous May 06, 2007

    On further examination it turned out only the volume up or down would cause the unit to lock out any further control inputs. I did a temporary fix by jumpering the the speakers with high wattage resistors and using a seperate stereo driven from the audio output jacks. I would still like a proper fix. I suspect a faulty IC but cant find a schematic to trace it.

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  • Master 1,153 Answers
  • Posted on Aug 16, 2007
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Pioneer say Main CPU bad. Replace and install capacitors, diodes and shield plate. See SI Bulletins for more info.(SI-a48032-G)

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ManualsLib has the manual for the SD-533HD5 here: https://www.manualslib.com/manual/384249/Pioneer-Sd-643hd5.html . (The manual covers two models.) Once you modify the picture parameters (starting from STD, REF THEATER, GAME), these are stored as the User mode. If you press Menu when done changing the parameters, that input should maintain the User settings for the last setting until you change the Picture type. If you modified the parameters for STD and then return to that input and change the Picture to GAME, any modifications to the GAME picture parameters will become the new User Mode. See page 50 of the manual for the details: https://www.manualslib.com/manual/384249/Pioneer-Sd-643hd5.html?page=50#manual .

I hope this helps.

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Consult the owner manual (you can GOOGLE to find one with the model number if you do not have it) to see if the set has a feature to lock out channel being changed---this feature is on some sets so if using a box children etc cannot change the channel.

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part number Description Cost
AMR2835 Lenticular Sheet $306.95
AMR2836 Fresnel lens screen $430.95


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I have the same problem with my 49txi, and I called pioneer and a repair shop as well. Both told me that the 49txi has a known problem with over heating and that its boards unsolder themselves. I would have thought Pioneer would stand behind something this expensive, but that was the old Pioneer in the 80s, and the new Pioneer says we are on our own.
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