Question about Mitsubishi WS-55807 TV

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No red video

Missing red video. I can turn the red gun up and get a little and retrace lines

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  • jtpete Nov 12, 2007

    Q2w06 Transister bad.

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The red video driver or the supply voltage is missing for the ic or possibly the gun is defective

Posted on Sep 11, 2007

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Tv takes up to four minutes to turn on and when it does it has distorted red lines running verticaly across the screen


is there retrace line with red colour then off agian.if yes there is red gun problem which is shorted with ground.you have to do give another way heater ac voltages or replace picture tube.

Oct 16, 2010 | Samsung Televison & Video

2 Answers

The tv keeps losing color


Hello,

The remaining red retrace are the giveaway that this is most likely not a CRT problem.

(If there were no red lines, it could be the filament for the red gun of the CRT going on and off due to a bad connection inside the CRT - bad news.)

How is a black and white picture? (Turn down the color control).

If B/W picture is good, then the problem is somewhere back in the chroma decoder circuitry.

Check the video input to the CRT video driver board and signals on that board. If B/W picture is also bad, then you can compare red and green signals to determine where they are becoming different. The red lines in your description sounds like the red video output circuit is drifting and messing up the background level, blanking, screen, or other setting. Could be a capacitor or other component.
Hope this will help...

Jun 01, 2010 | Polaroid TBX-2000AF 20 in. TV/VCR/DVD...

1 Answer

HORIZONTAL LINES ALL OVER SCREEN


This is what we called RETRACE LINE. This happens when the 200 V at C board is missing. Some times a 4.7 Ohms fusible resistor open, and find out the reason why it opens, could be a damaged RGB drive. The worse if retrace line show up together with a saturated green picture your green gun is damaged, in this case you have to change your CRT. Good Luck

Feb 24, 2010 | JVC AV-36D202 36" TV

1 Answer

Hi samsung tv using TDA 9381ps/0489 problem is Retrace line sound ok


180 volts from LOT o/p to drive pict-tube guns is missing . or vedio driver ic is faulty.

Jan 22, 2010 | Samsung Televison & Video

1 Answer

IM A TV TECH. I HAVE A SONY LCD KP-60XBR800 I HAVE NO RASTER. POWER OK, MENU OK BUT NO RASTER ON TUNER, TUNER VOLTS OK,CAN YOU HELP ME PLEASE. THANKS my email sergioaguirre0182@hotmail.com


check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.---- a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.---- with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT. excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen. check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines. -------- for getting any required parts to replace you can get it from www.radioshack.com or from www.partstore.com or from www.shopjimmy.com --------- thanks.please do rate the solution.thank you for using fixya.keep updated.

Sep 06, 2009 | Televison & Video

1 Answer

Sony trinitron tv kv type


The screen voltage adjustment should be on the back of the high voltage multiplier. It should be marked as "Screen", or "G2". Next to it, is the "Focus" adjustment.

Some models of Sony sets have two focus adjustments. This is for H and V focus.

When increasing the screen voltage will usually increase the wear factor of the electron-gun assembly in the CRT. This is because it is increasing the screen bias current.

When increasing the screen bias, the brightness will increase a little. When the CRT is weak, this may produce visible retrace lines more so than on a good working CRT. This is because the excessive screen current will stop allowing the electron-gun assembly to work at its proper cut-off level in order to allow the blanking drive to bias it off during the retrace period.

Increasing the screen bias will usually cause a shift in the colour temperature especially in the low level gray colours. This is because the AKG reference for the electron-gun biases will be offset due to the differences in the electron gun performance characteristics change.


Jerry G.



May 03, 2008 | Sony FD Trinitron WEGA KV-36HS510 36" TV

1 Answer

RED LINES


Your red CRT socket may be loose or have cracked solder if not, try turning down the red gun screen control inside the set just a little. Youre experienceing what is known as retrace lines

Jan 21, 2008 | RCA P52771AT 52" Rear Projection...

1 Answer

Red diagonal spottted lines


These are called retrace lines they occur because of the blanking pulse not turning off the electron guns in the picture tube during the retrace period. Since this is occuring with the red gun there may be a proble with the video circuitry connected to the red electron gun of the picture tube. This would include the red amp and the red driver transistors. You will need a schematic and a multimeter to properly test these items.

Aug 03, 2006 | Sony KV-36XBR400 36" TV

4 Answers

Redless screen


If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's and CRT monitors are very hazardous to service. Even when plugged out, they can store very high, deadly voltages. How old is the picture tube? If there's lots of phosphor burn on it, chances are the red gun inside the picture tube is out. A sure-fire way requires an oscilloscope. Check the voltages on the three color guns at their corresponding pins on the CRT's neck board. You can see their levels change as you tweak their adjustment pots on the neck board. If the red voltage is present and at the same levels as green and blue, then the gun inside the tube is shot. If the red voltage is NOT there, then you can work backwards and find out where you're losing it. It could be a bad buffer amplifier (transistor or I.C.), bad solder joint, or even a broken wire in the cable harness. check for cracked solder joints where the RGB, Grd Sync connector is. check the pins on the molex power supply connector, could be that the pin for the red is pushed back and is not making contact. Try swapping the red and green inputs if you see red on your monitor and no green, then it is NOT the tube. If you see no red still but still get a green where red should be I would suspect a bad chassis.

May 28, 2006 | Samsung SyncMaster 551 15" CRT Monitor

1 Answer

Blue Saturation with retrace lines visable


could be but there are a few checks that need to be donr first.. Try to turn down the g2 control just a bit on the flyback transformer. If no effect unsoder the blure drive transistor on the crt board If the blue is still there that means the crt is shorted and you could try to clean the elements with a crt rejuvenator and see if that helps. If the screen goes to red and green after you disconnect the blue drive transistor then you need to check the osd drivers as well as the rgb output drive from the video IC. If the blue gun in the tube shorted or leaky I have in the past and it really works a isolation transformer that plugs in to the crt socket and the other end plugs into the crt. What this does is isolate the the gun of the crt from the filiments and thats where they get shorted or leaky but for how long it will last who knows.

Mar 26, 2006 | Sharp 36U-S60 36" TV

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