Question about Sharp 27J-S100 TV

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Retrace line with red color

Pls help me

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  • Master
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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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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.

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Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} 1. Turn the green screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
2. Turn the red screen control on the Focus Block until retrace lines appear and gradually turn it back
Until the point where you can see the retrace line disappears, just before cutoff.
3. Turn the blue screen control on the Focus Block until retrace lines appear and gradually turn it back
until the point where you can see the retrace line disappears, just before cutoff.
4. If the screen still appears too bright after proper G-2 adjustment, you need to adjust the sub-bright adjustment in the service menu
control down until screen cut-off. (Service data Range is usually 21 to 25 in the Service menu, for Sony sets you first go to category "MCP2", & then adjustment item 01( "SBRT")= subright.
For electrical the focus, put on the screen a clear picture of your choice thru an input of the TV set from a DVD, then pause the playback of the DVD Look into each color and rock that color focus control back and forth (turn the control one way then the other way slowing down as the picture goes into the best focus. till the picture looks sharp do each color till they all look in focus. NOTE: it is best to look into each color tube to achieve the best electrical focus. For optical focus please follow the manual lens adjustment in the sets service manual
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Aug 27, 2009 | Philips 50P8341 50" Rear Projection...

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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.
(quote ends)
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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)

Jul 23, 2009 | Televison & Video

1 Answer

Picture Problem


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

2 Answers

Stanby light blinks 5 times


http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html



Go to this Blog. It "should " solve the problem.
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Give it a try, it's free and simple :D


Hope the blog helps you.

Jean

Mar 08, 2009 | Sony KP-57HW40 57" Rear Projection...

1 Answer

Thin red horizontal lines across screen


While looking at your TV, remove the bottom right speaker grill. There you will find a cover held by a couple of screws. Remove the screws and behind the cover you will find the "focus pack" which is a group of 6 adjustment screws. The top screws adjust (in order from left to right) the brightness of Red, Green and Blue.

What you will do preferably at night (or with the room dark) turn the top left adjustment screw (Red) all the way to the left and then gradually turn it to the right until the point you can see the retrace line and then turn it slightly to the left until the retrace line disappears. That's it! You can do this for all three colors - if need be. These do go out of adjustment every now and then. The 3 screws on the bottom are to focus the colors individually to minimize "bloom" on the screen. It's best to be in service mode on your TV when doing this OR open up the cabinet and cover (with something) the other 2 colors while you adjust the focus of the color you're adjusting.

Good Luck!

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My apex pf2725 tv screen is green


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.

Feb 05, 2008 | Apex Digital PF2725 27" 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

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Sony -kp65wv600


I got this TV for FREE from a guy posting it on craigslist because he saw "BLUE SWIRL LINES" also knows as "Retrace Line" on the screen and he went to several repair people and got high repair costs so he was giving it away for free, but i found a guide that tells you how to adjust the tv to make the blue or green or red lines go away, aparantly the line show up because the voltage on the color ray gun tubes that get out of adjustment. Here is the Link to the REPAIR GUIDE. http://www.somelifeblog.com/2007/06/sony-projection-tv-red-line-repair.html

Jan 11, 2008 | Sony KP-57WS500 57" Rear Projection...

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 | Televison & Video

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