Tip & How-To about Intel P4 System Configurator (P4SDRAM1) PC Desktop

Increase the life of CRT of a monitor/TV

To increase the life of a picture tube reduce the filament voltage slightly by connecting a 2 watt wire wound resistor in series with the filament supply. The value of the resistor should be chosen experimentally connecting 1 ohm to 4.7 ohms so as to get a fair bright picture. Though startup delay will be there,the color, contrast and clarity of the tube will last double than the normal. I am using a TV for more than 12 years and still the picture clarity is as comparable with a new TV.

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I have a Blues Jr III amp, I changed resistor R52 from a 22k to a 27k to increase the bias voltage and make the tubes run cooler. I am not getting a negative DC voltage reading on the top leads of R31/R32 and the tubes hot plate when turned on. I have a schematic and ran all the Dc voltage readings around the board and they are good until I get to R31/32. I can't seem to find the connection problem. I have removed R52 recleaned and resoldered to make sure the solder joint was okay

What happens when you replace the original resistor? The change might eradicate the balance within the circuitry. It might be appropriate to connect a wire wound variable rersistor of say 10K in series with the original resistor to see what changes occur with small changes. Measure other known voltage points around that part of the circuit and note the changes as you increase the resistance. It would be helpful if you could send a diagram of this particular unit.

Sep 12, 2011 | Fender Audio Players & Recorders

1 Answer


If it isn't a vibration problem (which light bulb filaments don't like) it may also be because they are on all the lime and have limited life. That's what my wife had going on in her SAAB.

The solution is to solder a diode in series with the ground wire from the lamp with the cathode end of the diode (striped end) away from the lamp. Use radio shack 276-1661 or equivalent 6 amps or more diode. Have this done by a good soldering nerd like me and have them use heat shrink to seal the connections. (Don't use a flame near the battery to shrink the tubing).

The diode reduces the voltage to the bulb, increasing life. Bulb may be a bit dimmer but not noticeable. Note: Solution may mess up bulb indication on fancy cars that may use some bad bulb detection signal on the wire; most dealers wouldn't know unless they are really up to snuff.

Mar 16, 2009 | 1994 Suzuki Sidekick

2 Answers

dark screen

the sound is locked off the TV good picture

Feb 20, 2009 | JVC AV-27320 27" TV

1 Answer

Please, Help me fix my TV

It sound like you have abad picture tube. Iknow this is not the answer that you want to hear. Sony's have video blanking circuit built into the video processor(in the jungle IC) when the emission of all three gun fall out of an acceptaable range. the screen blinks and when you turn the screen control on the IHVT all you see is re-trace. Some times there is a current limiting resistor in series with on lead of the heater on the crt board. By changing this resistor from 2.2 ohm to >.1 ohm @1/2 watt you can sometimes increse the filament voltage to the point that the blanking stops. This is only a temporary cure not a fix. The picture tube is probably bad. Scrivitron

Jun 20, 2007 | Sony KV-20FS12 20" TV

2 Answers

picture is dark

Does not seem like a bad tube alone. Could also be that the Video output Transistors Supply Filter capacitor having dried out. It is a 100mfd 160V capacitor, which on replacement will improve the brightness of the immage. And yes, you could also try increasing the heater voltage (Filament Voltage)of the Pictuire tube, this will definitely increase brightness, but will reduce the life of the Picture tube. You gotta think - 10 year old TV, should I repair or exchange and get a new one???

Mar 03, 2007 | Zenith Z27X22D 27" TV

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