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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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Re: No red video

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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Set comes on with a blue screen with retrace lines,then shuts down. Turned down screen control on flyback, set stays on cannot control brill

The set is shutting down because the picture tube is been over driven, it is most likely the picture tube has a short in the blue gun, turning down the screen control drops the voltage to a safer level. The only other possibility is a short video driver and open feed resistor usually located on the video board on the back of the picture tube.

Feb 23, 2011 | Sony KV-32S40 32" TV

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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 Standard (CRT) Televisions

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 )

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)
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 | Standard (CRT) Televisions

1 Answer

To repair a tv set

If it has white out with screen retrace lines it means that the 130-200 volt line is missing from the flyback transformer to the neck crt board. begin by checking if the .68ohm to 1ohm fusible resistor is open circuit.if it is then you either have a defective rgb drive chip, or in most sets a shorted drive transistor. a defective gun in the tube can also take out the fusible but unlikely.

Jul 09, 2008 | Standard (CRT) Televisions

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

Zenith tv, video retrace lines.

how is the 200 volt supply to the video output transistors??
measure the collector voltage of the video output transistors with the crt board on and off the crt. if voltage goes up when crt board is off then crt shorted

Apr 28, 2008 | Zenith Z25X22S 25" TV

1 Answer

Rca 32 inch tv

your problem is in red video output circuit.

as you are seeing lines with red color

those lines are called retrace lines.

please check

  • supply to red video output ckt.&red video output transistor.
  • loose crt base or crt base connector.
  • componenrs related to red video output section
  • red signal coming to red video output ckt from signal processor.
  • at last but rare cases crt weak.
  • hopr this will help

good luck

Oct 17, 2007 | Standard (CRT) Televisions

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

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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