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Can we measure the crt tv tube voltage and how?

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Let's just say it is over 10,000 to 50,000 volts. Don't go near the picture tube. Or anywhere else on the board without having a professional discharge tool. An if it has to be tested thenspecial high voltage testers or an oscilloscope (but only if the tv is plugged into an isolation transformer)

Posted on Oct 21, 2013


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My crt tv no pics but good sound

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If it has a picture tube first look with set on, three tiny filaments will be lit if good, not real bright as 6.3 volts ac voltage across two pins on the actual tube.

If you can see them lit they are ok---most sets mark them on the board at the end of the neck for the picture tube with H for heater.

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1 Answer


Hello pac997man,
This may mean a few things. The Green CRT might be defective, the video signal to the green CRT might not be present, and the high voltage to the green CRT anode might not be active. So lets tackle the first possibility:
1) The Green CRT might be defective: You will need a CRT tester to check to see if the green tube is functioning, or you can measure the voltages on the pins of the CRT and use the schematic to compare them. If the tube is bad it will need to be replace (this usually requires that the other tubes be replaced also to maintain color balance)
2)  The video signal to the green CRT might not be present: This problem can be tested by measuring the video signal on the cathode of the green CRT and comparing it to the test signal on the schematic. This test also should be performed on the IC that controls the video input/output (oh yeah this means that you will have to have a signal generator to provide the proper test pattern, and a schematic to do this test)
3)  The high voltage to the green CRT anode might not be active: This test requires that you use a high voltage probe to measure the anode voltage of the CRT, if you have no voltage there this could indicate a problem in the HV Trippler. Since the other two CRTs are working the chance of the IHVT (Integrated High Voltage Transformer) being bad is very slim.
 By now you are wondering if I intend for you to try to do this yourself? The answer is : No I do not. What I would suggest is that you take the TV to a qualified TV repair shop or have them make a house call to troubleshoot and fix your YV.
I hope this helps
Thank you,

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1 Answer

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i think you have weak picture tube. when gun becomes faulty this happens. Measure Red -Green-Bluue cathode voltages. and filament voltage.if everything is perfect then the problem with your picture tube assembly. Contact service centre for further rectification

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check for bad solders on the crt socket . If it turns off again try running the tv with the crt socket off the tube but 1st try to time how it takes for the tv to turn off then disconnect the crt socket. If it does not turn off the tube may be bad, if it does not turn off check the voltages at the crt socket and see if all the voltages at the colour outputs are close to the same, if so then you have a bad tube when you connect the tube and the voltages change conciderably the tube is gone

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2 Answers

Green is not being displayed on my TV

If you have experience troubleshooting solid state TV sets, you should be able to tell by a couple of voltage measurements if its a problem with the picture tube or the drive circuit. Simply take the multimeter and compare the base voltage of the green drive to the red or blue drive transistor. If the voltage is about the same, measure the collector of all three. if the green voltage on the collector is higher then the others, then theres an open between the drive transistor and the crt element. this could be an open resistor, a bad solder connection on the crt socket, or an open picture tube element. If theres no voltage there then your going to have to trouble shoot the drive circuit.

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