Question about Toshiba 32A50 32" TV

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How to disconnect main board in toshiba model 32a40 in order to check solder points

Need to resolder vertical ic part# La7833s

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  • 204 Answers

It can either be held in with screws on the bottom of the set, or in the set itself. It could also be held in with the plastic of the chassis that has clips on the bottom. You would usually pull the chassis and remove it from the holes. They are kinda L shaped. Be careful not to yank any wires. I would discharge the tube and unhook the neck board and the anode cup to make sure you don't yank those. Please use extreme caution when discharging a tube.

Posted on Oct 30, 2012

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Posted on Jan 02, 2017

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andyroid85
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SOURCE: Toshiba 32a32 chassis tac 245 powers up for 1 secopnd then red power light flashes.

just fixed one with that problem it was the vertical output ic Q301
that was shorted. try wicking it out. it is a LA7833S.
Postings say to be sure to use the Toshiba part

Posted on Aug 28, 2008

SOURCE: Toshiba 27d46 27' TV

Change the vertical IC

Posted on May 16, 2009

  • 4090 Answers

SOURCE: Toshiba 36 inch TV that has a shrinking picture.

Rod,

To ask those questions indicates a lack of knowledge in a very specialized area. This is not really a DIY. Soldering is a skill, especially in an object that has fine tracks. Spill excess solder on the tracks and you will short out the whole unit. Overheat a component with a soldering iron and it will kill it. There is also the Radiation risk at the rear of the TV as well as High tension. You need to know how to ground the unit when opening it to prevent electric shock of a lethal type.

I suggest you call a professional in to do this or take it to a local repair shop. This also involves unsoldering an IC Chip and replacing it. There are numerous money saving DIY's on here all thinking they can do it cheaper and just as well as a trained repair tech. Some actually get in and do the job, but 96% are back in a week or so with either the same problem or greater problems than before.

You have to know WHY those things occurred, they may have been set off by some other part failing somewhere up the line. and technicians know where to look and have the equipment to test the integrity of the whole system as well as generating a test pattern to align the convergence and color wheels. Take my advice for what your life and health may be worth, take it to a repair man and have it done properly

Posted on Sep 24, 2009

  • 2318 Answers

SOURCE: Need the vertical output ic part number for my

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

Posted on Sep 28, 2009

Testimonial: "Wow, thank you. Gave me the part number, and a place where I can buy one. Really quick to find it and post it here. I surely appreciate it."

gopakumarg43
  • 74251 Answers

SOURCE: vertical line

Check the deflection yoke connection cable for any loose contact at its connection socket at main board side. Unplug the connector out from the socket, and re-plug it back for at least tow times. Check the solder terminals of all connections to horizontal output. It will be best to re-solder all suspected solder terminals there. [horizontal sweep signals to the deflection yoke is absent now. Only vertical sweep is present now]

Posted on Aug 23, 2012

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1 Answer

Vertical line


Check the deflection yoke connection cable for any loose contact at its connection socket at main board side. Unplug the connector out from the socket, and re-plug it back for at least tow times. Check the solder terminals of all connections to horizontal output. It will be best to re-solder all suspected solder terminals there. [horizontal sweep signals to the deflection yoke is absent now. Only vertical sweep is present now]

Aug 22, 2012 | Toshiba 32A43 32" TV

1 Answer

When turned on the sound is good while on the screen thier is only one line


Hello
The vertical can is absent to your TV. Check the vertical output section circuit on the main board for fault. Look for any loose solder points at the solder terminals to vertical output IC. If found suspected resolder all suspected solder terminals by applying a little more solder. OK.

Mar 04, 2012 | Sanyo Televison & Video

1 Answer

Vertical deflection that would be fixed by banging the TV. Now banging doesn't fix it. Is this a solder problem? Can I resolder and if so, what would I be looking for? Thanks, Steve


Hello
There is some loose solder terminals at the vertical output section ot your TV. Just open the TV, locate the vertical output section. There is an IC in the vertical output section, usually screwed on to a metal heatsink to radiate heat away from it while it works. The solder terminals to this IC should be noted for any loose solder points. It is a common fault to most of the CRT based TVs, regardless of brand and model.
Look at the solder terminals of this IC for any loose solderings. This loose may happen, because, this IC will heatup while working, and repeted heating and cooling may make solder points to the terminals of this IC, will cause the fault you reports here.
It will be very difficult to detect these loose solder points, as some of them may be so microscopic to detect. So do what we do on service table. Just resolder most of the suspected solder terminals of that vertical section, including all solder terminals of the vertical output IC and related parts, by applying a little more solder, without making any solder bridge short in between adjecent solder terminals. This mut solve the proble of your tV.
Please adjust with my language, as I'm not an English. My mother toungue is entirely differet to that of English. I only try to exchange my ideas and experience to you. OK.

Sep 15, 2011 | Toshiba 32A50 32" TV

1 Answer

Model 32A40. Picture periodically reduces to one narrow horizontal line. Becoming more frequent. Does this mean picture tube is going. What might potential repair cost be? thanks in advance.


No it is not a tube problem .............hit your TV on left side or right side or on top & then observe ..........you will get normal picture or it comes & again it goes....if it is happening like that then following is the situation..........after 4 or 5 yrs in some TVs on main board ( also on CRT circuit board ) at some soldering joints crack develops....then due to loose contact picture becomes small in size or abnormal width, or rolls etc ...........when we hit that lightly then those loose contacts joins temporarly & again picture appears normally for some time............so solution is .....TV main board & CRT circuit board should be observed carefully & most of the joints should be re-soldered.......only a good service engineer can do that........even after hitting TV lightly if there is no response then main board has to be checked completely........in your case iam sure it is loose connection problem.........joints should be re - soldered ...100% it works again ................this problem cannot be solved by user unless user has idea about components( resisitors, transisitors, diodes,...etc) , have soldering iron , multimeter & other tools....................so contact good TV service engineer & just ask him to resolder joints .............iam from bangalore - computers, laptop, printers, etc ) ----- good TV service engineer will charge less .........

Aug 06, 2011 | Toshiba 32A40 32" TV

1 Answer

Picture has been reduced to a thin line in center of set sound and remote functions still work


Hello
Your TVs vertical output section has the trouble. All TVs have both vertical and horizontal scanning sections, which scans the picuture on the secreen both vertically and horizontally, to get a picture frame. If horizontal scan fails, you will see a vertical line at the middle of the screen, and if vertical scan fails, there will be a horizontal line across the middle of the screen. Your TV has the second stated trouble. To get it rectified, you have to open your Tv.
Unplug your TV from mains socket and open it. Locate the vertical output section. It is so easy to locate. Your TVs picture tube neck id fitted a coil alongwith it, which is called the deflection yoke, and it will have four wire connections. Out of these four wires, two of them will be thick, usually red and blue in colour, and the other twos will be thin. Just follow the two thin wires, you will reach to a point that these four wires are plughed onto a pin connection, on the main printed circuit board.
Upside down the board, and trace the track to which these two thin wires goes, through the print side, will reach to the vertical output section.
Normally this section consists of an IC for this purpose, and can be screwed onto a metal heatsink, as it will get heated when it works. Before unsodering it , just look at the soldering points of this IC pins for any loose soldering points. Loose soldering are very difficult to locate, as thay will be very minute up to microns, so resolder all the pins of this Ic, by applying a little more solder, and see the effect. Sometimes this will resolve the problem. If not go tho the main input voltage that goes to Ic pin. If it is not there, check out the reason. If it is there and still vertcal scanning does not occur, resolder out the IC from the circuit board, and go for a same type and number.
If you wants anymore asistance, feel free to contact me through Fixya. OK.

Dec 08, 2010 | Insignia NS-RTV32 32" TV

1 Answer

The vertical hold on my tv goes up and down. The picture still shows but its just in the center of the tv but if i hit the side it goes back to a fullscreen.


There will be some loose contact in the circuit board of your tv. May loose sodering in the vertical output stage; around the ic used. Try resolder almost all the solderings around it will solve the problem. Vertival sync; signal may not absent in the main ic too. Anyway resolder the main ic too. Surely it will solve your problem.

Oct 13, 2010 | Toshiba CF30F40 30" TV

2 Answers

No picture - just sound. What's wrong and is it fixable?


IT IS PROBABLY THE MAIN BOARD THAT HAS FAILED. CALL 1-800-SAMSUNG FOR NEAREST REPAIRCENTER.

Nov 16, 2009 | Samsung TXM3297HF 32" TV

1 Answer

Toshiba 32a32 chassis tac 245 powers up for 1 secopnd then red power light flashes.


just fixed one with that problem it was the vertical output ic Q301
that was shorted. try wicking it out. it is a LA7833S.
Postings say to be sure to use the Toshiba part

Aug 17, 2008 | Toshiba 32A32 32" TV

1 Answer

Toshiba 32A40 32" TV Problem


does any one can send me the schematic of TOSHIBA 32A40? I have a vertical problem and I need to locate the vertical IC or trancistor.
I only see a horizontal line on my Tv.

thanks.
teranco@hotmail.com

Jul 13, 2008 | Toshiba 32A40 32" TV

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

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