Question about Toshiba Televison & Video

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Vertical linearity problem

The 25" CRT-TV is used TA1268N/TA8427K(Toshiba IC) .there is vertical linearity problem .upper side of screen is extended,but lower side of screen is normal. which components needed replacement???? This TV has not component of adjust vertical linearity.

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  • Toshiba Master
  • 74,136 Answers

Check and replace all the electrolytic capacitors at its vertical scan output section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/

Posted on May 18, 2014

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6ya6ya
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Posted on Jan 02, 2017

Benimur
  • 6966 Answers

SOURCE: CRT TV vert section

Hi,

Vertical linearity is more of a DCV bias issue rather than feedback or AC coupling. Hence it would be more apt to suspect resistors rather than capacitors. Of course, it is also possible that the large IC that drives the Vertical output maybe at fault (least likely) but often would have trimpots for adjustment. Most current designs do away with trimpots and rely on self correcting (feedback loop) which is simply a resistor in the 100k range. In certain instances, it could be a thermistor or resistor or diode limiter attached to the yoke itself.

Best would be to use a service manual or at the very least a schematic diagram with voltage readings and compare actual on PCB against schematic.

If you could post back the make & model or preferably the chassis number of the TV, might be able to comment back known common vertical issues.

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 Jun 06, 2008

welcomejee
  • 10594 Answers

SOURCE: NO DEFLEXION VERTICAL

Please check its Horizontal Output Transistor, supply voltage to H-Out Transistor. let me know any update to help you further.

Posted on Aug 10, 2008

SD Tech
  • 14553 Answers

SOURCE: Need ic an 5523 vertical ic for toshiba 29cz6sz CRT tv

Get the full number like AN5521 etc and contact Suburban Electronics (internet catalog and 800 number) or with same number search for parts dealer nearer to you--Suburban is in USA>.

Posted on Apr 20, 2012

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1 Answer

How do you adjust the vertical lines going across my screen?


The vertical deflection circuit of your tv has a problem.
First, try to replace the vertical ic. This ic can be found near the plyback or horizontal section. It is a linear ic with heatsink.
If nothing happens after replacing the ic, replace all the polarized capacitor near the ic and resolder the components at the vertical section.

Jan 18, 2011 | Durabrand BH1304D 13" TV

2 Answers

NO DEFLEXION VERTICAL


check this link ......

http://www.freelists.org/archives/techassist/06-2005/msg00159.html

Aug 10, 2008 | Toshiba CZ32V61 32" TV

1 Answer

On Toshiba TV model CF35F40 I have replaced vertical output Q301 (TA8427K), I got back the vertical raster but it is out of sync. I tried to find a control to put it in sync but I did not found any. In...


1. Reheat your solder, it could be the culprit, a good soldering technique is needed.

2. Check you minor component, the capacitor for the oscillator part and the filter capacitor.

3. Check also the IC part number from the original, sometimes prefix and suffix thus stand for some minor variations.

Goodluck, this is just to add some info.

Oct 05, 2009 | Toshiba CF35F40 35" TV

1 Answer

Need the vertical output ic part number for my toshiba 36" model CN36Z71 TV


This set uses the vertical IC part number TA8427K.
Check this website to find the part you need.

Sep 28, 2009 | Toshiba CN36Z71 36" TV

2 Answers

Tv screen get smaller


not the flyback
it is either the vertical ic
or related caps
it is repairable probally between $75 and $100

what size screen and how old (is it worth it? that your call

Dec 20, 2008 | Toshiba 27A50 TV

2 Answers

Toshiba CE35f15 TV


This is a vertical circuit problem that is either bad connections on the vertical IC or a defective IC. If you can solder, you can fix this yourself. Look for a small flat IC attached to a heatsink with about 9-11 pins. It may be marked LA7837 or something similar. Try resoldering the pins first. If that fails to resolve the problem, replace the IC. There may be defective caps in the circuit as well, but those don't usually cause complete vertical failure. If the picture does not return fully, update this and we'll continue on to the next step.

Dan

Sep 29, 2008 | Toshiba Televison & Video

1 Answer

CRT TV vert section


Hi,

Vertical linearity is more of a DCV bias issue rather than feedback or AC coupling. Hence it would be more apt to suspect resistors rather than capacitors. Of course, it is also possible that the large IC that drives the Vertical output maybe at fault (least likely) but often would have trimpots for adjustment. Most current designs do away with trimpots and rely on self correcting (feedback loop) which is simply a resistor in the 100k range. In certain instances, it could be a thermistor or resistor or diode limiter attached to the yoke itself.

Best would be to use a service manual or at the very least a schematic diagram with voltage readings and compare actual on PCB against schematic.

If you could post back the make & model or preferably the chassis number of the TV, might be able to comment back known common vertical issues.

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.

Jun 05, 2008 | Televison & Video

3 Answers

No vertical output


My Toshiba 36A50 had the same issue. The picture would gradually shrink until it no longer appeared and there was only a thin line running from left-to-right across the center of the screen. The volume still worked perfect.

From information I gleaned from this site and others, I removed the main circuit board and flipped it over to re-solder the pins going to the Vertical IC (TA8427K). This IC is right about center of the board mounted on an aluminum heatsink so it is soldered in vertically. You can easily see the part number on the IC and it is the only one of that part number. Additionally, the silk-screen on the PC board has a QC301 next to it identifying the part.

After I re-soldered it, the TV works excellent. I just did this yesterday afternoon 10.26.08.

Thinks to note that have been pointed out by others:

  1. There is high voltage in the TV even after the power is removed. There are several sites where they tell you how to remove the power.
  2. Make a note of all connections. Most of the connectors are keyed to go in only one way but some you can turn the connector either way. Write down all the information and take some digital pictures before you disconnect everything.
  3. As was pointed out but other people, the Vertical IC and/or some of the surrounding capacitors may be defective and need replacement. Its possible that your local Radio Shack may have what you need but I would not count on it. A possible source for parts is www.digikey.com.

Jun 01, 2008 | Toshiba 36A50 36" TV

2 Answers

No picture, only sound


The set has a shorted vertical output IC, probably a TA8427k. The capacitors around the heat sink of this IC dry out and cause the IC to run hot. The correct repair is to replace the vertical output and the electrolytic capacitors near it. Also use 105 centig instead of the original 85 centigrade. The is some time a pico fuse or current limittng resistor which must also be replaced. This a common problem with Toshiba and is not a bad picture tube. The usual cost of this repair is around $120-150 depending on the integrity of the technician. Scrivitron

Jun 18, 2007 | Toshiba 27DF46 27" TV

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