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You have a bad capacitor. I do not know your TV model number. Find a 160 volt to 250 volt capacitor at 1mf. Replace with same value. This will fix hundreds of TVs.
likely DC 5 to 9 volts but perhaps as high as 12 for most devices. 9 is a good middle ground to start. You can get adapters with a switch for 3.5 to 12 volts, just be certain of the polarity and always start at lower volts like 5 or 6.
You mean the collector voltage on the Horz output transistor is 200 volts?
I would check this by removing the transistor and then measuring the voltage on the board (where the collector or center leg of the transistor is soldered to).
I don't know what kind of tv this is but you should see 130v or 135 volts. RCA sets you should see 140v. If the voltage is too high replace the voltage regulator.
In CRT TV's the tube needs quite a high voltage around 30,000 volts. This is generated in the set. When you turn the TV on it is possible you hear the high voltage arcking. This happens if there is dust and dampness. You may see specs of light on the screen when this happens. You could try cleaning the inside.
no high voltage. most problem is possible shorted horizontal output transistor. check collector of transistor. should be 135 volts dc. if not.... power supply or fuse.
The set you are talking about I am unfamiliar with .. however as an engineer for 23 years I am sure it is not unlike any other CRT TV as you say you have no voltage on the rgb is the tube heater on ( you should see a glow at the end of the tube ) if not check you heater rail voltage , check your oscilator Ht output transistor should be 300 to 360 volts on the emitter if this goes down then the lineoutput satge will not opperate hence no picture and in many cases the audio is fed from the secondry of the Line output transformer hence no sound either .. DO NOT ATTEMPT TO DO THIS UNLESS YOU HAVE HAD TECHNICAL TRAINING VOLTAGES HERE ARE IN EXCESS OF 19 KV to 25,000 Volts DEPENDING ON TUBE SIZE AND SHOULD NEVER BE ATTEMPTED BY UNTRAINED PERSONEL... Vortash
in order to set voltage you have to adjust the govener idle screw , that is what helps regulate the voltage, the higher the motor revs, the higher the voltage, the lower, the lower the voltage. the govener arm is normally a gold color arm with a small rod connected on top of the block. it should have a screw with a nut, or just a screw. turn counter clockwise, then ck voltage output,repeat till desired voltage. i usually, set mine at about 124, because once you put a load on it, it will bring the voltage down some. hope this fixes your problem. let me know. troy
If the flyback is bad, the 135 volts will reach about 70 or 80 volts and the set will shut down, and the LED will blink twice. Usually, for 8 blinks, the high voltage capacitor inisde the splitter is shorted, and an easy test for this is to disconnect the thin gray ground wire, move it away from everything else and turn the set on. The set will now run but the ground wire will hiss like crazy. If you replaced the splitter but the set will not run, try disconnecting the 3 high voltage wires to the CRT's and see if the set runs. If it does, reconnect the high voltage wires one by one until you find which CRT is loading down the high voltage. Let me know how you make out.
TV's use high voltage to generate the stream of electrons traveling
across the picture tube hitting the screen and lighting it up (thus the
name Cathode Ray Tube). It takes about 25,000 volts to do
this. In normal air, it takes about 1000 volts to jump an inch of
air, so the high voltage transformer needs to have good
insulation. It generates the voltage through a technique of
charging the transformer's magnetic field with a low voltage of about
140 volts then letting it go where upon it flys back out the high
voltage side at much high levels (Thus the common name
flyback). A most common failure in a CRT type TV is for the
insulation to crack in this transformer which is a unique component for
each model of TV and leak out the current overstressing the circuit
driving it. You can liken it to a little bolt of lightning
getting loose in the circuit and has the same sound on a smaller scale.
It would be well to replace your flyback transformer before it gets
worse and blows up something else as well. Best done by a
professional used to handling high voltage. The picture tube can
retain voltage even when the TV is unplugged for some time, and
replacing the anode lead (the big red one) can be dangerous.
Hope Ya Fix It!
Is the voltage staying at 135 volts or is it rising?? There are several power supply fix it kits available as well as a way to test the power supplys. please let me know as I have a nice library of sony kits to use as well as a way to test the power supplys. Also a bad Crt can cause a shutting on and off of a projection set as well. If this is the case, try having the CRT rejuvenated and see what happens.
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