Keohi HDTV

 

 

Powered by Keohi Web Design

[BRAND SPECIFIC][TOSHIBA][SERVICE MENU]

Anamorphic Squeeze on Toshiba

<< Back to Service/Designer Menu Page

Tip from Michael TLV:  Getting a 16:9 squeeze on the TNxxX81 sets is accomplished via the service menu by adjusting the para, HIT and TRAP parameters.

Once set to 16:9, you will have to do a major re-convergence of the picture. Takes about 10 minutes. Must be repeated when you switch back to normal 4:3 mode.

You use the same HIT/PARA/TRAP controls to reduce the overscan on the set on the Top and bottom. The WID is for the width for left right overscan reduction.

When in HD mode, you could permanently set the TV to 16:9 as once you go back to 4:3 NON HD material, the original 4:3 parameters are restored automatically and without further convergence work.

Here are the step by step instructions:

For only the truly bold. :)

NOTE:   Please note that this applies to the High Definition section of the TV. Not the NTSC section.

This is only to be performed to the HD mode so that HDTV is properly formatted to 16:9. The step by step process is "NOT" to be applied to the 480I or 480P inputs!!! Please be aware of this.

You "can" apply it to the 480P/I signals, but you will royally mess up the  geometry on all the non 16:9 material.

Let’s see how this procedure goes.

  1. Use masking tape (removable) to tape up the frame of the 4:3 TV. You will need to make pencil marks or pen marks on the tape to figure out the location of many things.
  2. Use AVIA or VE to chart out how the 16:9 frame will look on the TV. On VE, use Title 20 and use masking tape to mark out where the top and bottom edges of the 16:9 image are. Your final position of the 16:9 HD frame will probably vary somewhat from these markings. You may end up inch too high or low. Not a big deal. You can also use fundamental geometry to figure out the size of the 16:9 image for your particular TV, but this way is easier. Not that the geometry way is hard, which it ain't.  
  3. With the 16:9 frame marked out, go to the HD mode by feeding the TV a High Definition signal. I use either the Starchoice HDD200 decoder or the Unity Motion receiver which outputs a 1080i menu signal. The UM also generates test patterns.
  4. Go into the service mode and activate the convergence grid immediately. Now save it and come out of the convergence mode, but leave the pattern on the screen. Use the HIT control and start to vertically compress the picture height until you reach the defined top and bottom of the 16:9 area. I hope you remembered to write down the service menu settings before you start changing things. As you compress the vertical height, watch in despair as the convergence goes off kilter and the geometry “dies” on you. Straight lines start to bend and bow.
  5. Adjust the PARA/TRAP/WID/VLIN/HPOS controls to decrease the left/right side overscan and correct as much as possible the geomteric distortions. You won’t be able to fix it very much, but you can do a bit here.
  6. Don’t even try to do the convergence yet, but if it makes you feel better, go ahead. Now the fun part begins. The HD convergence grid is your guide to figuring out where the center of the 16:9 image is. The vertical lines running left/right up and down the screen should be an odd number. On the 61H95, there are 17 lines defining 16 grids. Pick the center line (line 9) and that is the center line of the picture. Measure from the bottom of the 16:9 to this center line. Make sure the measurement is the same on both sides of the TV screen. If not, here is your first geometry test. Move the R/G/B line #9 to line up with the centerline.
  7. You’ve established the center of the picture. Now run a string from the left side to the right side of the TV. Tighten and tape down. This is the first geometrically straight line to use as your geometry template. From the center line there are 8 lines above it and 8 lines below it. Measure the distance from the centerline to the top line and the bottom line. Take the measurement and divide by 8. This is the distance that should separate each of the lines. On my TV, the space between each line was 4.21 cm or just 4.2 cm. Mark out this distance along the left and right sides of the frame on the tape … plenty of tick marks. Now tape up 16 more pieces of string to the TV set and you are now ready to tackle vertical geometry adjustments.
  8. Bring up the convergence pattern and turn off the three guns … (I’m assuming you know how to do this.) Bring up the Red crt first (or green or blue … doesn’t matter, your preference, but red is the easiest to do.). Begin adjusting the geometry to match the 17 strings. Probably easier to start from the center and work down or up. Do the first line from left to right and then move up to the next line. Repeat. When all this is done … do a bit of fine tuning the red and then save the changes. Start with blue next and shut off red and green. Do the same. Save again and then do the green. Save again.
  9. Finer convergence … bring up red and blue together and converge the two. Then Red and green. Converge again. Finally, fine tune with all three R/G/B on at once. You have now finished vertical geometry adjustments. Watch some HD material and enjoy for a while.
  10. Horizontal geometry is next. Establish horizontal center by measuring the screen’s width. Place your string down the center. Count the number of vertical lines and decide where you want the edge of your picture to be. This is and was based on the WID control. The HPOS will help you to center the grid on your TV’s physical center as defined by the center string. Use the same method as previously discussed to measure out to the left and right the total distance from the centerline to the left and right most vertical grid line. Divide that distance by the number of grid lines left and right of the centerline. You have your optimal spacing for the vertical lines now. Mark them out on the tape and place your string. 
  11. Now do the left/right convergence starting with the red CRT and shutting off the other two. Then do the blue, then the green. Layer the green on top of the red and fine tune. Layer the blue on top of red and fine tune. Then fine tune all three colours at once.
  12. That’s it … you are done.

Good Luck and Best Regards for those that want to take this route.

Additional info

The HD memory is signal specific and not input specific.

Regardless of the input you use, if you feed the set a 1080i signal, you can enter the service menu and adjust the vertical height to 16:9. Once this is done, when you feed it a HD signal, the vertical height pops to 16:9 automatically. Feed it a 480 signal and it pops back to 4:3 proportions.

If you set up the HD section, you will need to do a major reconvergence, but once done, it is set.  

The HD section is not affected by progressive scan DVD signals. And the only way to access it is to feed a 1080i signal into either of the inputs in the set.

You cannot set the TV to do 16:9 for progressive scan DVD's alone. If you try, it will affect all analog inputs like the S-video and composites. The set only has two specific memory settings ... HD and Non-HD which is everything else.  

So anything you do to the DVD input will affect the S-video.