Question about Sony KP-46WT500 46" Rear Projection HDTV-Ready Television

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How do I find screen control pot?

How do I find screen control pot b for blue crt

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It is behind the front bottom panel, will see 6 little nobs, 2 for blue-2 red-2 green

Posted on Jan 08, 2009

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The projector is stuck on the blue screen. It will let me change the input but it will still stay on the blue screen even though everything else is on and working.


Hello!
"blue screen" means: picture is all blue, but there is a signal coming through? Do you see channel logo? Menu? If so, blue CRT or CRT board is at fault. Depends on the age of the set. If set is fairly new, then try to bang on the neck of blue tube with rubber screwdriver hands. Very gentle! While set is working. If you see the retrace lines and TV shuts down then, CRT is at fault. If not, try to play with blue "screen" control of "focus block". Black plastic module with bunch of thick wires attachad to that. Has 3 "focus" and 3 "screen" controls. For each of the tubes. In many cases you'll be able to adjust "blue" down to normal. Usually, those controls are smeared with white paint and hard to turn by hand. Loosen those with little pliers, then adjust manually or via small "phillips" screwdriver. If nothing helps: CRT board is at fault and must be replaced or repaired. In this case you won't see any characters on blue CRT, just solid "blue".
good luck,
Alex.

Jan 20, 2012 | Sony Televison & Video

3 Answers

Z3 projector.3 years old. Blue tinge in one corner of projected picture. Grainy picture on dark scenes.


There may be some problem with your picture tube else try this that looks like retrace lines. Anyway, you should try to adjust screen pot not focus pot. Make sure you are turning blue screen pot (there are 3 focus pots and 3 screen pots) and do it slowly. If you turn it too much, it will affect your grayscale

Jun 23, 2008 | Televison & Video

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Overstretched screen


the circuitry to regulate the screen size and the height and width has failed and your crt need service but it would be more expensive to repair than to purchase a new LCD monitor.
the control pots or resistors usually go out on a crt over a period of time and have to be replaced This is very expensive. Also with the pots the capacitors in line with the resistors have to be replaced. Then there are the regulator components such as a LM317 which regulates the voltage to the circuit to keep it at constant voltage for the pots to adjust.

Apr 17, 2010 | HP Pavilion M70 17" CRT Monitor

1 Answer

Hi there ive got a toshiba 43vj13p very blue picture


Hello, you can then buy a replacement lamp or lamps Toshiba 43VJ13P? Thank you

Dec 21, 2009 | Toshiba 53H71 53 in. Rear Projection...

2 Answers

I have a sony kp-51hw40, it started to have blue and red lines accross the screen. now the picture turns blue then turns off. is my red and blue gun wore out?


find someone that knows about TVs to take off the front access cover and adjust the screen controls .DON'T TOUCH THE FOCUS KNOBS.Just the screen control knobs.Usually they can work a few more years with adjustements . But if it can't be adjusted to work then the guns would have to be repaced.Many many many many of your model were affected by a little screw up sony made with their CRTs.

Oct 03, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Have 46 samsung dlp that has green lines all over the screen . menu still works but doesnt go away on the menu mode. the green is so thick that you cant see any picture in the background.


Red, green, or blue retrace lines ( a quote from "Notes on the Troubleshooting and Repair of Television Sets", found at http://www.repairfaq.org/sam/tvfaq.htm#tvrgbrlin )

Where only one color is showing, suspect an incorrectly adjusted individual background/bias control or bad part on the CRT neck board for that color.
  • Individual brightness/background/bias control(s) - mark setting of pot for the problem color and then see if a slight adjustment removes the retrace lines. See the chapter: "TV Adjustments". Of course, if this happened suddenly, the problem is not due to a misadjusted control though a dirty pot is possible - turn it back and forth - this might clean it and restore normal operation.
  • Component or connection on CRT neck board - insufficient voltage to or incorrect biasing of the video driver for this color can result in the CRT never totally blanking. Compare voltages and signals, and swap components between good and bad channels to confirm.
  • Blanking circuit - this may be a part of the video/chroma chip or separate. Check and compare waveforms of good and bad colors to determine if the blanking pulses are making it to the video output.
There is a slight possibility that a bad CRT may result in visible retrace lines. To eliminate this possibility:
  • Disconnect the filament - all evidence of a picture, raster, and retrace lines should disappear once the filaments/cathodes have cooled (15 seconds or so. If there are still visible retrace lines, the CRT is suffering from cold or field emission from someplace (may not even be the cathode).
  • Turn down the screen (G2) control on the flyback (usually). If one color remains no matter how you set the control, again there is some kind of weird emission from the CRT. However, if white/gray retrace lines remain, the problem may be in the screen supply.
(quote ends)
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You will be greatly helped if you have a schematic for your TV set, and you may need to change some parts, clean some connector contacts and/or tweak settings inside the set, so remember the original settings before you tweak them...

Good luck

3rq8 (Triarcuate)

Jul 23, 2009 | Televison & Video

1 Answer

CRT problem


you need to adjust the red screen control of the crt under the speaker grill turn it down with the tv running.

Mar 02, 2009 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Further assistance needed


I just replied you and here once again...

Please pull front speaker grill and find focus block, fixed at corner having 6 control knobs on it.
Find Blue Screen control knob there.
Put your TV in AV mode to get dark screen and just press Display button on remote to have AV display.
Now slightly rotate control knobs counter clock wise until thin lines (retrace) disappear. Job is done and put back speaker grill, press display button again to disappear screen display.

Dec 13, 2008 | Sony KP-51WS500 51" Rear Projection...

1 Answer

G2 alignments?


Hello YankeeTwidgt,

Here we go you will need a schematic diagram (You may already have one but I thought I would mention it ), an oscilloscope, a TV signal generator (NTSC color bar, RGB purity screens, and pattern screen), and a voltmeter (I would prefer you have a VTVM, but a digital meter with high impedance (>=10M) will be ok).

First turn all of the color and tint controls completely down (This includes the main color and tint and the pre-amp color controls if you have access to them).

Then turn the RGB pots fully counterclockwise.

Once this is done connect the signal generator set to channel 3, and set to the specifications on the schematic, use the color bars, what you should see at this point are bars of various shades of gray.

Then turn the generator to the purity setting and set the pattern to red.

Once this is done your screen should be dark or dark red, gradually adjust the R pot until the screen is pure red and the voltages, and signals match what is seen in the schematic (mark this point on the pot and the return the pot to fully counterclockwise).

Do the same for the Blue and Green Controls (Blue first and then Green).

Once all of the pots are marked and turned to counterclockwise, set the pattern to gray purity, and turn the pots back up to their marked positions, the screen should be gray. switch to color bars and the screen should have the proper colors.

This is a course adjustment, and you will have to do a fine adjustment using the schematic, and the test tools, but this will put you way into the ball park.

The reason these pots are not talked about in gray scale adjustments is because they usually don't have to be touched. That's why it is important to get them back to specification using the voltmeter and oscilloscope to set the signals up properly.


I wish you success,

Shuttle83


Jul 27, 2008 | Philips 51PW9303 51" Rear Projection...

2 Answers

Blue Screen


Your blue crt has a short - you can verify this by unplugging the socket from the blue crt and powering up the set and you should see a yellowish looking picture with just the red and green crt's operating. You can try turning down the screen control pot (B) for blue with the blue crt on (just to the point where you no longer see retrace lines in the picture on a blank input)Sony has had a lot of problems with the crt's on these models and sooner or later all the crt's will fail - For a permanent repair all must be changed.

Aug 20, 2007 | Sony KP-46WT500 46" Rear Projection...

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