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In onida tv retrace line is over in base board which component to replace

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Posted on Jan 02, 2017

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SOURCE: retrace lines in top of tv...

These lines are cause by defective capacitors in the vertical section of the TV. No adjustment will work unless the capacitors are replace. The values of the capacitors are between 1uF, 10uF or possibly a 47uF.
I do not have the service manual at this moment but you can google it by the model number of your TV.
Let me know if you need further assistance.

Posted on Jun 16, 2009

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1 Answer

Fault finding retrace line on screen ?


Check the video output supply voltage. If it is less than normal, retrace lines will be visible. If the screen voltage is greater than normal, the retrace lines will be visible. You should check all these. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/
Check these above said voltages at the CRT base card.

Apr 14, 2014 | Sansui Televison & Video

1 Answer

No picture retrace lines


Video output [Matix section] has damaged. Contact any service technician. If you wish to get more details, check the site linked here. Surf the site in "MOSAIC" view. It will make surf easy.
http://electronicshelponline.blogspot.com/

Jan 22, 2014 | Televison & Video

1 Answer

Sony wega-ha21m80 problem no picture reterc line ok sound


I THINK YOU MEAN RETRACE LINE. if your tv has retrace line the video amp circuit should be checked its a transistor or in other cases its a IC replace either of them.if its an transistor on circuit voltage measurements shoutld be 2.4 volts from the emitter amd 2.8 volts on the base.can also be a faulty inductor..good luck.if you are not a tech have a tech repair your tv.

Oct 03, 2011 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

My onida 21" black color


Possible there is a fault in soldering. Poor joints in the CRT base circuit of the CRT tube will result in poor connection after some use due to the fact the heating and cooling will detach off the leads. So use a good soldering iron to touch up all the points in your main board and the CRT board and it must work provided your tube is not faulty.

Feb 07, 2011 | Televison & Video

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 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)

Jul 23, 2009 | Televison & Video

2 Answers

Retrace lines in top of tv...


These lines are cause by defective capacitors in the vertical section of the TV. No adjustment will work unless the capacitors are replace. The values of the capacitors are between 1uF, 10uF or possibly a 47uF.
I do not have the service manual at this moment but you can google it by the model number of your TV.
Let me know if you need further assistance.

Jun 16, 2009 | Toshiba 27A45 27" TV

2 Answers

Have power but no sound or picture


Do you have high voltage? Check by turning up one of the screen controls to see if you have retrace lines.(pinstripe diagonal lines across the screen) If present turn the screen control back down until the lines just disappear. Check diodes 6003, 6012, 6025, and resistor 3669. If you don`t get a retrace line by turning up the one of the screen controls, check for missing voltages or shorted components in the horizontal output and power supply circuits. Note: Philips TV`s can be tricky even for experienced technicians. Good luck

May 22, 2008 | Philips 50P8341 50" Rear Projection...

1 Answer

Retrace lines and poor convergence


you have bad solder connections on the convergance board solder then and get back to me k

Oct 30, 2007 | JVC AV-48WP74 48" Rear Projection...

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