Question about Zenith A27B33W 27" TV

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Part Need Resistor in degausser circuit marked on circuit board as THX3415

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This is infact a thermistor. Can you read any of the numbers on the part itself? I don't have the service manual for this model.
Dan

Posted on May 01, 2008

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Bush tv problems


There must be something wrong with the luminance circuits and potentiometers on the board at the end of the picture tube. It can be also that you need to degauss your picture tube. Try degaussing it before tampering with the potentiometers.

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TV wont power on


Device is a thermistor (thermal resistor)
thermistor and a vatistor control the on
time of the degausser Sams Photofacts has the
schematic for the set have to match the suffix041eb6a.jpg
Some public Libraries stock photofact schematics you
may be able to go to al local library and get the part number
or the specs as to whether it is ptc or ntc etc to get a match
or online here

Dec 28, 2007 | Zenith B27A11Z 27" TV

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There is a burned capacitor cx3210 and melted thermister thx3415 in Zenith B36A24Z Can dirt cause this problem from overheating or arcing?


When more dust accumulate, and absorbs moisture from the atmosphere, ther is a chance to get arcing. Clean the device by using a vaccum cleaner if possible. Burned degaussing coil cannot be repaired. It should be replaced along with degaussing posistor.

May 08, 2012 | Zenith B36A24Z 36" TV

1 Answer

Both the the left and right have large color blobs, more intence at times, shows more on blk/white


There is a degaussing resistor that activates when tv is first turned on and purifies the screen so there is no color contamination, sometimes it will become defective or develope bad connections on the circuit board. The part looks like a box "black/green" and is located near the power cord. If it has stopped working it would explain the color blotches. To fix it! the part needs to be replaced or resolded back on the board and a degaussing coil used to give it the once over, tv tech carries one just for that purpose. The other possibility is if speakers are to close to the viewing screen the magnet will leave blotches and must be degaussed to correct it.

Feb 07, 2011 | Philips Standard (CRT) Televisions

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Need Circuit Diagram, or convergence resistor list for PT51D31CE


they are 2.2 ohm , i have replece many of this before

Apr 19, 2010 | Panasonic PT-51D31 TV

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Characteristics capacitors 407214-PJ and MZ75-10RN


The MZ75-10RN is not a capacitor, although it looks like one. It is a
10 ohm (cold) positive temperature coefficient resistor. The resistance becomes very high when it is hot, limiting the current. This part is usually found in degaussing circuits etc.

May 28, 2009 | Philips Standard (CRT) Televisions

1 Answer

Degaussing problem


There is an automatic de-gaussing circuit within the TV and it's likely to be the culprit. When the set is first turned on (before you even see a picture) this circuit is active and as it warms up, a thermistor opens up and stops the circuit from operating. It does this because as it heats up it's resistance rises and the circuit stops the current flowing through the de-gaussing coil. Over time from the heat/cool cycle, the connections to the circuit board fail. Simply re-soldering the thermistor is probabaly all that's needed.

Oct 07, 2008 | Standard (CRT) Televisions

1 Answer

Degausser


I don't have the service manual copy. I was servicing these sets more than 6 years ago when I was working with a service contractor for warranty repairs.

The degausser is very simple. The AC is switched on with the relay. The relay feeds the degausser in series with the thermisistor. There is not very much involved to trace this out by following the traces on the circuit board.

The common fault is that the thermistor goes bad. You can order this part from any of the parts distributors for Sony parts. I cannot remember the cost of the thermosistor, but I think that from Sony it was in the area of about ten dollars at the time.

It is very rare that the coil or the relay goes bad. On some rare occasions I have seen cold solder connections cause the degausser to not function.

Your set will work with no degausser working. You can order from any place that sells parts for TV service, a manual degaussing coil that plugs in to the AC. You can manualy degausse the CRT face several times per week. This should work out well.

Manual CRT degausser coil:
http://www.datadev.com/degausser-small-office-monitor-tv-television-dc13.html


My preference is original parts. But, if you want to chance an after market part check the link below.

Donberg Electronics sells some types of thermistors:
http://www.donberg.ie/warehs/grouptp.htm



In the service shop we used a manual degausser when were changing picture tubes. We needed to have the screen degaused very fast so that we can do the purity and convergence set-up.


Jerry G.



Jul 06, 2008 | Standard (CRT) Televisions

3 Answers

COMPLETELY DEAD


Hey !!! I solved my own problem. After I soldered up the thermistor I still had the same problem so I checked all the known parts around the startup circuit including the power supply relay and relay driver. All found to be good so I then attached a scope and signal generator and applied a horiz signal to the base of the Horiz output...voila!! I got high voltage so I tracked the horiz siganl thru the circuit and found a coil to be bad along with 2 electroletic Capacitors. The Zenith part number for the coil is 20-4073-01 and its part # on the board is LX3262. The caps are 4.7 Mfd @ 50 VDC located at CX3261 and 10 Mfd @ 350 VDC located at CX3205. I hope this will help someone else.

Ed

Feb 13, 2008 | Zenith B36A24Z 36" TV

1 Answer

Red lines, Red screen, tried previous fixes


I would look for an open resistor in the red drive circuit on the CRT board. Check all the components in the red circuit and replace any which are not within tolerance. The resistor could be from a 1 ohm to 10 ohm depending on the model. If you find no bad parts then check for cracked solder connections on the board and resolder. If this does not work you will need a scope to look at the signal going to the red drive transistor and make sure that it is correct. Anything beyond this will require a repair shop. Remember TV safety. Good luck.

Jul 07, 2006 | JVC AV-32F803 32" TV

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