Question about Projection Televisions

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Philip RPTV Hello, This is a PHILIP RPTV. MODEL:43PP925/79. Problem is blue gun does not focusing.Both mechanic and electronic adj. do not work. Thank you for your help

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There are a few malfunctions that can cause such.

ONE: Mirrors out of location. But it usually throws the picture off center, also. This can be caused if the set is dropped or kicked badly.

TWO: Out of focus. Can be caused by drift of the circuits or from a malfunction of the video drivers. You can check this by going to the crosshairs and see if the lines are sharp and narrow. If not, then the focus is off badly - most likely the blue gun. You may be able to set the focus and other levels for brightness and contrast and color to optimize this weakness as these are all somewhat interrelated, especially in the extreme settings. You can make adjustments for these above what is available from the OSD by getting into the service mode. See this web site for instructions on how to enter it. http://www.fixyourowntv.com/servicemenu.php

THREE: Worst case is the blue gun or projection tube is failing and needs replaced - which I don't recommend due to the very high cost of doing so.

FOUR: And it is possible the blue gun/tube has been knocked out of alignment by dropping or moving the set.

I favor the focus adjustment as the first remedy to try. You can do that yourself. But if it turns out the mirror is out of location or the blue gun is defective you will need a technician for help on those items.

Posted on Nov 14, 2008

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I have a Mitsubishi RPTV. Everything looks fine except for the blue colors look blurred. I have tried software convergence but the blue still looks blurred and strange. What can I do?


ADJUST THE ELECTRICAL FOCUS. AND THERE IS A MECHANICAL FOCUS ALSO. SET THE ELECTRICAL FOCUS BY LOOKING DIRECTLY INTO THE TUBE AND ADJUST IT SO THE TUBE SURFACE IMAGE IS SHARPEST. THEN LOOKING AT THE REAR OF THE SCREEN ADJUST THE MECHANICAL FOCUS, ON THE LENS UNTIL IT IS SHARPEST. ALSO IT MIGHT NEED A CLEANING OF LENS&MIRROR. DIRT AFFECTS BLUE LIGHT FIRST.

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Be shure the guns are set properly follow below:
ADJUSTMENT PREPARATION:
  • Pre Heat Run should be finished.
  • Be sure Screen Color Temperature setting is in the COOL mode
  • Room Light should be minimal.

ADJUSTMENT PROCEDURE:
  1. Go to I2C ADJ. Mode. (With power Off, press the INPUT button on front panel and then press the POWER ON button then release. The Service Menu is displayed.)
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  3. Set G DRV (COOL) to center data value (3F).
  4. Set R, G, and B CUTOFF (COOL) data settings to [80].
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  6. Choose SERVICE item [1] of I2C ADJ. Mode. Select CURSOR RIGHT and the Vertical will collapses.
  7. Adjust any Screen VR. Screen VR should be turned clockwise gradually until that particular color is barely visible.
  8. Repeat for the other two colors.
  9. Exit SERVICE MODE by pressing the CURSOR LEFT on remote.
  10. Exit SERVICE MENU by pressing the MENU key on remote.
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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.

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You need to adjust (actually bit decrease) G2 volts (calls Screen volts) of Blue gun.
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1 Answer

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Hello Butchhugh,
This bight be due to the blue gun failing. What I would do in this situation is to use a CRT analyzer to look a the condition on the CRTs. If it proves to be one of the CRTs, I have some bad news for you. these CRTs are usually a matched set and if you replace one you should replace all three, However there have been some folks who only replaced one CRT only to have to replace the others at a later time. First check the CRTs with a CRT analyzer. Then if the results are good try to measure the voltages on the pins of the CRTs with a voltmeter, you will need a schematic to tell you what these voltages should be. By using the schematic and a voltmeter you should be able to trace down the defective circuit. Now, if you do not have a background in electronics, what I would suggest is that you take your TV to a TV repair shop and have them work on it. 
I hope this helps
Thank you,
Shuttle83

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Hello lcastillo225,

I think that you just called my shop, well in any event what you need to do is to contact the manufacture and order the part from them. The part is called a fresnel screen. Give them the make and model of your set and they will send you the part once you order it, however I would suggest that you get a qualified TV Technician to install the fresnel once you receive it. The cost will be around $150- $350 (average based on industry installation prices) for labor.

I hope this helps,
Thank you,
Shuttle83

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