Question about Toshiba CZ27V51 27" TV

3 Answers

COld Solder/Short Here is a strange one. If I lean the whole TV forward, I have no problems. When I sit it correctly, the picture and sound shut off, and the LED blinks. It's probably a cold solder. The silver box that the cable input plugs into seems to be the issue. What is this silver box (It appears to be fuses?), and has anyone heard of this? Shaking the cable itself does no good, it only works if I lean it forward, which takes pressure off of the chassis. The tv is not old, and the picture and sound are fantastic. It's never seen hard use/abuse, and has never been moved since it was placed in it's current location. I'm good with solder, and a mechanic, so small tool use is not a problem, I just don't know what not to touch for safety reasons. Thanks.

Posted by on

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer
Re: COld Solder/Short

Ok, so it's the tuner. That makes perfect sense. With the back off, nothing seems loose. The PCB is basically to the right, under and behind the CRT. I had it working for about two hours, then it pulled it's old tricks. Should I pull the PCB, or do you think tapping with an insulated screwdriver on various components would do the trick? I'll be careful not to short a connection. I don't really like poking around in an unfamiliar region, but I can R & R any component, no matter how small the solder. I've fixed power supplies for my studio, and I've done audio gear. It's the high voltage that worries me. I don't want to smoke a component. Supporting it other than on it's base is a good idea. I'll suspend it from it's sides and see if "chassis" flex is what causes it, or if it's directly related to a component moving when it's level, and back again when it's leaned forward. You are correct that the PCB is mounted directly to the base.Thanks for the really good info.I appreciate the help.

Posted on Oct 22, 2006

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Contributor
  • 68 Answers
Re: COld Solder/Short

Before taking anything apart, if the TV is on legs, try propping it up in the normal position so the legs are just off the floor. If this does nothing it will show it is not pressure distorting the cabinet. If it does the movement of the cabinet must be shifting something on a PCB, such as a dry joint or a plug/socket. In modern sets there is no chassis; the Printed Circuit Boards are usually clipped and screwed directly onto projections inside the cabinet. The dangerous high voltages are usually well insulated and confined to one PCB. A PCB for control is usually in the bottom of the cabinet, and this is the one you should look at. It only has low safe voltage on it. The mains lead goes to the PCB which also has high voltages for the power supply; if this is in the bottom of the cabinet also then suspect a fault on it, but beware you really need an expert.

Posted on Oct 16, 2006

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 337 Answers
Re: COld Solder/Short

The silver box where the cable plugs into is the TUNER,there are no fuses in there and the problem is not likely to be there,the loose conection could be anywhere but you have a few places to check,with the tv unplug from the wall you can safely check for loose conections in the power supply area and around the output transistor including the areas of the horizontal drive circuit and output transformer,those are the areas most likely to the symptoms you have but you can also check the edges of the chassis for a broken or crack board.Let Us know if you need more help.Be careful when you are checking for conections.

Posted on Oct 16, 2006

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

I have a 1999 32" Sony KV-32S45. Picture comes

Hello, Sorry to hear you are having problems with your Sony TV. The problem you are describing is a pretty common one being the slow collapse of the vertical circuit. This tv is know for having bad solder connections and the picture tube developing an internal short. Luckily for you it is a problem with cold solder joints, and when you straightened up the components, you temporarily made a good connection. You need to get someone to re-solder any and all bad /cold solder joints especially around the vertical circuit area making sure no solder bridges are formed during the process. Make the tv is unplugged before starting to do the repairs!
Good Luck! Rich L.

Dec 04, 2010 | Sony KV-32S45 32" TV

1 Answer

My TV when turned on has no picture but good sound. I released the screws holdingitto its base and tipped it slightly forward and he picture came back on, It now works with a small wedge holding in its...

you probably have cold solder joints on the board inside the TV - bring it to a repair shop and they will be able to re-solder these for you

Dec 08, 2009 | Samsung TXJ2554 TV

1 Answer

Zigzag lines in picture when first turning on the tv

possoble cold solder connections breaking when unit is cold they expand when hot thus making connection.

Oct 11, 2008 | JVC AV-27530 27" TV

1 Answer

Sony tv problem

You have a loose solder connection or two. If I knew the model number of the set, I could be more specific. I would expect the repair would run about a hundred dollars, so make sure the picture quality is great before going to the expense.

Aug 02, 2008 | Standard (CRT) Televisions

1 Answer

Philips TV Model 32DW6557/05 Screen Problem

hi it sounds like a capacitor in the verticle circuit located on the main board. it is near the verticle ic. the verticle ic also could be bad the cost is around 85 dollars for a tv shop to fix. sometime a cold joint could be found around vert ic. a soldering iron is required with solder.tap the side of tv if picture comes back it is just cold solder joint.

thanks Doctor video

Apr 25, 2008 | Standard (CRT) Televisions

1 Answer

No Red- Intermittent


A short answer, YES. I suspect a cold solder on the red drive transistor. That transistor is one of 3 identical components (one for each of the blue & green). They are normally found in a small squarish PCB that is connected to the rearend of the picture tube. In some instances, they are also heatsinked. More often you need to remove the shield/screen protecting the foil side of the PCB. This has to be done gently since it can easily crack the glass holding the pins.

Cold Solders are corrected by applying heat from a soldering iron and probably a dab of solder lead. Solder joints should be shiny (not dull gray) with no air bubbles.

If your concern has not been corrected after completion of the above procedures, you may need to replace the red drive transistor. it might also be worth your while to check for any other component that may suffer from cold solder and/or any loose connection(s).

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.

Feb 15, 2008 | Zenith A27A11D 27" TV

1 Answer

Got sound and no picture.


It would seem that there is a loose connection or even perhaps a cold solder internally.

What needs to be done is to open the back of the unit start checking the multiple connectors to the PCB. Unfortunately this has to be done with the unit live and with the use of a mirror to be able to determine in which area/section that the picture will be restore. You would need of a bit of insulated rod about 1 to 1 1/2 feet long to move the wires and push a little on the connectors (a broken fiberglass fishing rod would be perfect). Determining which one is pretty straight forward. Correcting is simply inserting the erring connector more firmly to the socket/mate.

Cold Solder is done very much the same way but rather than wires and connectors, you would need to push on the terminals/leads/pins of the components. Alternately, you can turn the PCB board over and with the use of a strong light and a magnifying glass, visually inspect the solder joints. More often cold solder develops on high powered components such as high wattage resistors, diodes, transistors, regulators. Corrective measure would be re-applying heat through a soldering iron.

Both the above requires familiarity with electronic circuits and components, use of a DVM and a soldering iron. If you are comfortable, you may need to seek the services of a qualified professional.

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 04, 2008 | Toshiba 27D46 27" TV

1 Answer

No Sound, great picture

Hi, A suggestion to a similar post @ If all else fails, you may want to try the "thump test" this will help you determine if its a loose/cold solder problem inside the TV. Give your TV a good whack at the side, top or back, if sounds comes on even briefly, it's a loose/cold solder problem, if not then you probably have to have the unit serviced by a qualified professional. The "thump test" is not a recommended action. Most techs would not even mention it but somehow it is performed (whether deliberately or not) by most. If verified that sound is faulty due to loose or cold solder, then it is a simple matter of locating the fault and resolder. Hope this be of some help/idea. Post back how things are or should you need further information. Good luck and kind regards.

Aug 26, 2007 | Sanyo DS24205 24" TV

1 Answer

Sound is fine, but no picture

could be a bad solder connection or maybe the CRT socket has come off slightly. I lean more to a bad solder connection at the flyback area screen G2

Dec 14, 2006 | RCA F36650 36" TV

Not finding what you are looking for?
Toshiba CZ27V51 27" TV Logo

186 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Standard (CRT) Televisions Experts

Jaime Hernandez

Level 3 Expert

2267 Answers


Level 2 Expert

49 Answers

Cindy Wells

Level 3 Expert

4718 Answers

Are you a Toshiba Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides