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


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I unfortunately do not have a schematic for your set, but can give you some general information that may help.

Often these devices are either a VCR (voltage controlled resistor) or TCR (temperature controlled resistor) They are commonly used to "ramp up" power when the circuit is energized... in "old school" CRT sets, a common use was in the screen degaussing circuit. In LCD sets, they are most likely used to "fire up" the cold cathode discharge backlight tubes. They are indeed semiconductor devices and do not respond to digital meters... the input impedance is too high.You may get some sort of reading from an old Simpson 260 analog meter or something similar, but use caution because their operating voltage can damage semiconductor components. You would require a curve tracer to properly analyze the voltage ramp.

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This model uses two of the STK-392-120 CHIPS and here are most of the usual resistors to suspect or check:

Hitachi AT03411S RK43 RESISTOR Hitachi AT03608S RP22 RESISTOR Hitachi AT03195S RK46,RK54, RK62 RESISTOR, 1.8OHM 1W Hitachi AT03857M R815,R865 RESISTOR, 1/2W 100 OHM Hitachi AT03191S RK50 RESISTOR, 1W 1.2 OHM Hitachi AT03197S RK50 RESISTOR, 1W 2.2 OHM Hitachi AT03199S RK41 RESISTOR, 2.7 OHM 1W Hitachi AT03202S RK42 RESISTOR, 3.3OHM 1W Hitachi AT03204S RK58 RESISTOR, 3.9 OHM 1 WATTThe RK ones are all marked on top and bottom of circuit board---usually if one is bad you will be able to see it is discolored---all are very low value and should read open or good only.

This is a fairly easy set to do this on---the whole convergence board (right side from the back view) is held in with 3 screws and an assortment of plugs--3 plugs are identical (convergence yokes and you need to mark so you get each back in same place)

A row of black snap plugs on the left side and with the screws and other plugs removed the board will lift up and out of the set.

DON'T waste your money on one of the "kits" being sold on the net---you can buy a pair of the chips for about 12 dollars on Ebay and usually only one (if any) of the resistors will be bad---those kits sound like a good idea but at 50-80 you are buying things you will not likely need to repair the set.

Let me know if you have any questions and if this information helped you rate this solution as I do this here for free.

SD TECH


45c74e4.jpg

Dec 17, 2009 | Hitachi 43FDX15B 43" Rear Projection...

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 | Televison & Video

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

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