Question about Sharp 27J-S100 TV

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Retrace line with red color

Pls help me

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  • Master
  • 6,966 Answers

Hi,

I am assuming that this is a conventional CRT type TV. Most if not all TVs of this design has a small squarish PCB right at the very rear of the tube encased in a shielding of some sort. There would be three (3) transistors in said PCB responsible for driving the 3 color guns of the TV (red, blue & green). In some instances, it could just be a single power IC. Either the transistor or the IC would be heatsinked. The transistor for the red color is defective and would require replacement (if IC then the whole IC). In some instances, it could only just be a cold solder.
retrace line with red color - 65100b6.jpg
This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.


Posted on Sep 17, 2008

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  • Sharp Master
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YOU have either a shorted picture tube or red out put transistor is bad on CRT board.

Posted on Sep 17, 2008

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How to repair top horizontal lines problem ?


The fault you say is retrace line problem. Reduce the screen voltage and check whether it vanishes.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Retrace line problems and reasons are described by one post.

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Our sony trinitron 27" wega less than 5 yrs old..when powered up flickered off three times now stays on but the color is very red no matter if we reset or do a color adjust or unplug it from the cable box...


sometimes picture tube tvs develop shorts between the internal electrodes usually cathodes to filaments causing the one or more of the guns inside the tube to go high in emission, when this happens the screen or picture you see will get excessively in this case red and some horizontal diagonal lines will also show causing the tv to shut down, another condition that may cause an excessive red screen may be a failure of one of the voltage source that feeds the color amp in this case the red ampl, this also may cause the retrace lines and tv shutdown.i hope this explanation helps you better understand what might be going on with your tv. In both cases technical analysis will be required and in some cases even the picture tube condition can be corrected with out having to resort to a picture tube replacement. i hope i answer the your inquiry to your liking and if so please let this site know by leaving some pos feedback.

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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.
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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)

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I have a magnovox 19ps45s122, when you turn it on the screen turns blue w/ slight retrace lines then shuts down. I changed the flyback, with no help.


This problem is caused due to inbalance of three colors viz red , blue, green. This is the problem can be solved by changing Picture tube

Jun 16, 2009 | Televison & Video

1 Answer

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In that set its usually a bad picture tube. The lines you are seeing are called retrace lines. You can take it to a shop and they may be able to rejuvenate the tube

Mar 13, 2009 | Televison & Video

1 Answer

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This problem occurs when there is defect in the chroma demodulator circuit. The usual symtom is a red or magenta color rastor with white retrace lines about 3/4' apart through out the display area.
In the worst case scenario, it could also be a defective picture tube. In either case, this is something only a qualified TV repair technician can service.
I hope you still have warranty left on this TV..

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Hi,

Your posted/describe symptom seems to be that the green color drive is defective. The "lines going across" are flyback retrace lines brought about by the safe problem.

The corrective procedure would be to replace. In most TV units, color drive are three (3) identical transistors: for the blue, green and red. They are normally located at a small squarish PCB attached to pins of the CRT right at the rear end of the neck. More often, they are heatsinked. Repair should be a straightforward desoldering the defective component and replacing with a new one.

In some versions, color drive is a single IC power pack.

Still, it is also possible that the problem may be due to cold solder on any or all of the pins of the above describe transistor (or IC).

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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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

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  • 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.
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  • hopr this will help

good luck

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your problem is in blue video output circuit.

as you are seeing lines with blue  color

those lines are called retrace lines.

please check

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

good luck

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