Question about Sony PVM20L2 20" TV

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Picture is dark...displays as mostly and redish brown wondering if picture tube may be the problem

The picture in one of my Sony PMV20LV video monitors starting going bad a few months ago...We use the monitor as a "preview" and we can no longer look at the monitor to determine shots because picture is dark

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It's time, more than likely, for a CRT...accordianman

Posted on Feb 19, 2008

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1 Answer

My picture is redish pink


Yes it has a picture tube.
My LG 32" does the same thing and has for several months. I just turn it off and back on again and it goes away. We will get a new tv instead of fixing it.

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I have a phillip magnavox big screen tv it works fine but the color is too dark i think i need a picture tube


If its the one indicated here or one like it :

The picture tube type (CRT) rear projection tubes require annual cleaning.

With set off and back removed locate the three large black lens atop the chassis--hard to miss them.

The are the red, green, and blue tubes and are your light source for the picture---------if dark and they are dirty or dusty the picture will be darker and not as sharp or clear as it once was..

spray some glass cleaner on a paper towel and wipe them clean.

Do not touch anything else in set and do it with set unplugged.

put back cover on and see if picture is noticeably improved; if so do it once a year or more if in a dusty place.

Let me know if you have questions.

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Hello

Blue video output section of your Soney tv has failed. It may be due to a open video output transistor or a resistor. Video output section can be located at the picture tube base card itself. in some models, Sony used transistors, and on others they uses IC for this section. Just open your tV, and measure the voltages at the Red, Green and Blue cathode voltages. It should be almost the same to each other. In your tVs case, the voltage at the Blue cathode will be high. Normally it should be due to an open resistor or loose or bad solderings. I advise you to resolder most of the suspected solder points with applying a little more solder, without making any solder bridge shorts in between. Check it out. If this does not help, check Blue output transistor, or if it is an Ic; whatever may be used, for open. If found faulty, replace it with same type and number. OK.

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1 Answer

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In the Sony TV a dark display is generally a bad picture tube. I have seen many of these and thought I could correct it with a deflection repair. I would next put the main board in another TV and saw that the board was just fine.The TV had a good picture.You can bet you have a picture tube that is bad!

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1 Answer

My sony shows dim, could it be the picture tube. I can see the picture when it is dark in the room; if the sun is out you can see the picture only it is very light.


picture tubes harsly ever go out i have work on curtis mathis tvs from the 70s and their tubes were great most like the leads within the tubes need cleaed in order to do theis take it to you local repair sop an they can burn the filament so that they are bright again.

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1 Answer

Sony KP-51WS500 lossed it's green color...


FIRST YOU NEED TO LOOK INSIDE THE UNIT FROM BEHIND WITH THE COVER OFF AND SEE IF THE TUBES ARE LIT. AT THE BOTTOM OF THE TUBES BY THE CIRCUIT BOARDS, SEE IF ALL 3 ARE GLOWING ORANGE,(FILLAMENTS). IF THEY ARE ALL THE SAME THEN LOOK INTO THE LENSES AT TOP AND SEE IF THERE IS ANY LIGHT INSIDE. THESE SETS ARE COMMON TO HAVE BAD SOLDER CONNECTIONS ON THERE CRT BOARDS. EITHER LOST THE FILLAMENT CONNECTION OR LOST THE VIDEO DRIVE SIGNAL. LET ME KNOW, WE CAN GO FROM THERE. CAN YOU USE A SOLDERING IRON?

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1 Answer

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If you use a scart connection then make sure it's in the connector tight. A loose scart lead can cause display problems.

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Sony KP-51WS510 51 in. Dark Picture


These sets have been known to have loose welds in the picture tubes. Most likely your tubes are showing this problem.

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1 Answer

Picture darker/less color/smaller until warm up


Hi there!
Have you checked for dust on the Tubes and mirror? This may cause a bad picture quality. Also power supply related problems like capacitors can cause a dark picture. Try replacing some of them in the power supply area and line stage.Also adjustments in the service mode,but for this you will need the service manual. Good Luck,JUS004

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