Removing a GU10 Bulb

Monday, 8 October 2012 15:45 by ranjanbanerji

How many men, engineers, women, etc does it take to replace a light bulb?  I have heard these jokes a billion times but recently learned that perhaps there is some substance to these jokes.  About 6 months ago I purchased a track light from Home Depot.  It takes 4 GU10 halogen bulbs that fit snuggly into the lamp holder.  Yesterday one of the bulbs burned out.  A bit too fast if you ask me but anyway that’s not what this post is about.  So I tried to get the bulb out but realized that I could not get a good grip on it and that no matter what I tried the bulb would just not move.

Now this is a bit of a problem if you have just one fixture that uses this bulb type.  Because you will most likely never remember how to put or more importantly how to remove a bulb of this type.  So now I have a bulb that fits snuggly into its holder flush with its opening so you cannot grip it and I have no idea whether this screws in, has pins, and how is it to be removed. 

Well removing a GU10 requires pushing it in a bit and then turning it counter clockwise.  You can see the pins of a GU10 in the picture below.

GU10-1 

The GU10 socket looks like this:

GU10-2

So to get the bulb out I used one of those transparent rubber suction/vacuum cups you use to attach a hook to glass or some other smooth surface.  It doesn't have to stick to the bulb.  You just need to press it to the front of the bulb till you feel the bulb move back a bit then you gently twist the suction cup counter clockwise.  The rubber cup grips the glass quite well and you should be able to twist counter clockwise and easily remove the bulb.

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Sony Rear Projection TV Convergence

Monday, 19 April 2010 21:26 by RanjanBanerji

I have an old (or what seems old) Sony KP-51HW40 Rear Projection High Definition TV.  Over the years I noticed that the quality of the image was no longer very good.  I called in a Sony Authorized technician who used my remote and converted the screen into a grid and got busy doing some alignment stuff (Convergence).  A few years later the same problem came back.

This time I decided it is not worth paying $200 to get the convergence fixed on my TV.  After a bit of web searching I found this  site.

I followed the steps and my TV is as good as new.  The instructions provided at the site were good but I ended up modifying the approach.  In either case be please read carefully and try this at your own risk.  I am no professional.  Please read all the instructions at the site before reading my modified version.  There is a wealth of information there.

The steps I followed were an abbreviated version of the original instructions provided by Larry Dillon  at http://www.techlore.com/article/19631/Sony-Convergence-Procedure/#29242.  I think they are simpler but I, of course, maybe missing steps more pertinent for other Sony TV models.

  1. Put the TV on a 480i/p signal in full mode, i.e., go to a non HD channel
  2. Turn the set off using the remote control
  3. To get to the service menu press Display, 5, volume up, and then power
    • Your TV will turn on and you should see a menu displayed on the screen.  If you have a widescreen TV then press the zoom button to set your TV to Full Screen Mode.
    • 2 and 5 keys cycle through the menu items, the 1 and 4 keys cycle through the sub menu items. 3 and 6 keys change the value of the selected item
    • Mute then enter will save any changes you have made, if you have made an error, turn the set off and any settings you have made will be lost and your set will be returned to its previous values.
  4. Use the 5 key to cycle through the menu until PJE menu
  5. Use the 9 key to select fine convergence mode.  A bracketed rectangle symbol will show up in the center of your screen.
  6. use the 6 key to select the internal convergence pattern of choice.  Keep pressing 6 to cycle through different grid patterns.  Choose one that works best for you.  I like the black background, i.e., whatever is playing on the TV is not visible, just the grid lines.
    • You will notice that the grid is white but there are red lines or bleeding out of the grid.  A lot tougher to notice are the blue lines.  In some cases you might even see red lines parallel to the white grid, not just bleeding.  This means you need convergence.  All you should see is a clean white grid.
  7. Use the 3 key to change the color that you will be adjusting. As you press the 3 key the center cursor (rectangle bracket) will cycle through red, green, and blue.
  8. The following steps are if your remote control has a joystick type of knob.  If your remote is of another kind then I am not sure what you need to do.
    • Pressing the 3 key select red or blue
    • Now use the joystick left, right, up, or down button to make sure that the corresponding red or blue lines merge cleanly with the white lines.
  9. The 1 and 4 keys will move the cursor position. When hit repeatedly, this will move the cursor in a spiral pattern over the entire screen. For each position in the spiral use the joystick to converge the line for the color you selected by pressing 3.  You can press 3 and change the color and converge too.  If you press the joystick button down the cursor will turn white from the selected color.  Now the top, down, left, right of the joystick will move the cursor around the screen.  Another press of the joystick will bring it back into convergence mode, i.e., the cursor will turn to the selected color and the left, right, top, down positions help with convergence.
  10. I prefer using the 1 and 4 keys to spiral through the grid.  According to the original instructions (provided by an expert) its is the better way to go. 
  11. When satisfied, hit Mute then enter to save data. If not satisfied, simply turn the display off to return to original settings.
  12. Turn the set off.
  13. Turn the set on and then check other modes for convergence errors. Such as Wide Zoom etc.  Then also look at the HD channels and repeat the steps.  Touch up any mode you wish to using the above instructions. What ever mode you are in when you enter the service mode, will be the mode you will be adjusting.

At first this all may seem daunting and painful.  But I think it took me about 20 minutes to wrap up most common modes I use my TV in.  I now remember why I liked this TV.  Over the years I had gotten used to watch poor quality image.

 

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