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My CRT oscilloscope dont work. I need a circuit diagram and information to find the fault. There is no serial or model number and I have searched the web and cant find any information. the machine is Laboratory Oscilloscope Cat Q_1280 Any help would be apreciated. Thanx

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  • May 11, 2010

    What's not working? Totally dead? No trace? Deflection problems?

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  • Televison & ... Master
  • 2,594 Answers

Just buy a new one, they aren't all that expensive, I bought a cheap one100 meg one for 100 bucks a few yrs ago and its worked good

Posted on Mar 08, 2018

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Posted on Jan 02, 2017

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SOURCE: samsung projection tv convergence problem

I was just working on replacing my stk's and was wondering if you could tell me what value the resistors are? Here is my previous post if you would like to see it. http://www.fixya.com/support/t191186-blue_out

Posted on Sep 25, 2007

BFixed
  • 104 Answers

SOURCE: picture problem

Aside from the parts you mentioned check the vertical connection to the yoke (usually yellow and green wires), it may have a cracked solder joint or it could be burned. Also check the yoke for a broken vertical winding.
If the line is yellow with no other colors you may also have a bad color gun or drive transistor. If all color guns are working the line should be white.

Posted on Mar 14, 2008

  • 4234 Answers

SOURCE: sony tv no picture only horizontal line

The probable defective part is the vertical IC. If changing that does not resolve the problem, check the capacitors in the same circuit. Also, check for the proper voltages at the vertical IC. If the IC is not being fed its power, it won't work either. I don't have a listing for your specific model. If you can post the vertical IC part number (LA7837 for example), I can list the voltages per pin.
Dan

Posted on Apr 09, 2008

  • 1 Answer

SOURCE: I need a user manual for a Leader LBO 522 oscilloscope

You can find the manual for a LBO-522 (amoungs others) at http://bama.sbc.edu/leader.htm

Posted on Jul 10, 2008

  • 1 Answer

SOURCE: looking for a schematic diagram of circuit board

hi'

Posted on Apr 23, 2009

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35 inch Mitsibutchi TV model #CS-35201A, serial #502637, manufactured 1993 TV made a popping sound when turned on and now only visable object is a straight horizontal colored line in middle of screen....


Hello dan82810,

The picture tube or CRT is not the problem, and yes this set is fixable. What has happened is that the vertical deflection circuit has malfunctioned. More precisely the vertical coupling capacitor has malfunctioned (The pooping sound was the capacitor exploding).

Open up your TV (take the back off and unplug the set), and look for the damaged capacitor, it will look puffy or if it has exploded.

To fix this problem you will need the schematic diagram for the TV (can be found at www.servicemanuals.net). Then you will need a multimeter to measure the DC voltages on the vertical output circuit, and finally an oscilloscope to measure the waveforms at the vertical output circuit and the input to the vertical windings of the deflection yoke transformer.

Now what you should basically find is a sawtooth wave at 60Hz which is the drive for the yoke transformer. However since the coupling capacitor is bad you will have the wave at the output of the vertical output stage, but not at the input of the yoke transformer. Use the schematic to find the value of the capacitor that has malfunctioned.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Feb 28, 2009 | 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

1 Answer

Wiring diagrams


I am not aware of the schematics being available for free for this model, What is the problem you are trying to resolve? Perhaps the diagram is not needed.

Keep us posted.
Dan

Jun 02, 2008 | Philips Televison & Video

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