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How to discharge crt with screw driver - Televison & Video

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This requires technical skills. Basically to discharge a crt you need a long screwdriver and a 2 wired side to side alligator clips. Unplug the set from outlet for safety. Wear a rubber shoes as you are a begginner, this in case that something has missed your body discharge it to the ground for your protection. First connect the alligator clip on the conductive part of a screwdriver since i think you are beginner. Clip the other end of alligator clip connected side to side to the crt ground, this wire is non insulated just around the crt tube. Or if you cannot find it, on most cases the tuner ground is also use. Hold the connected to ground screwdriver's insulated handle. Do not touch any conductive line of any part of a tv or the screwdriver metallic line. Try to peel off the Flyback anode through the point of your grounded through alligator clips and if you hear a little or a huge spark, again repeat it for safety reason. Thanks for using Fixya.

Posted on Oct 15, 2013

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I was having video problem on my crt sony kv-g21p2. audio is fine and 1000volt is not producing but 115 volt is producing and i have replaced new fbt but still the same


good day since you have been already replaced the fly back transformer as you said so meaning the problem is not the FBT. any way here are some of my recommendation to isolate the problem .
  1. unplug the tv unit and then unscrew to open the back cover and gain access the crt chassis.
  2. now with use of flat screw driver remove the anode cap of fly back transformer make sure you discharge first for your safety.how are you going to discharge the voltage,get single wire then flat screw driver now strip one end of the wire and tie it to the flat screw driver the other end of the wire splice at the chassis ground of picture tube. and then insert the end portion of the flat screw driver to the anode cap to discharge the voltage left. you can now pull out the anode cap.
  3. by this time you will turn on the tv unit place the anode cap in a safe position not to damage the board be careful its a high voltage. plug the power cord and turn on then observed if their is an arching at the anode cap usually a blue color just to know if the high voltage is present.
  4. if their is a high voltage that means horizontal output transistor is good thats why the fly back transformer is on. your next step is to check the secondary voltage of fly back transformer with the use of digital tester or even an analog tester to know why their is no 1000v. check bad fusible resistor near the fly back transformer usually a 22ohms value this is where the 1000v pass through going to chroma board or video board. if open or no resistance pull out the said part and then replace with the same rating value.check also shorted diode connected to the resistor sometimes it was the cause why the resistor get bad.
  5. after you replaced defective part insert again the anode cap for testing once again be careful.
  6. now turn on again the tv unit then observed if their is a video on the screen check also the heater voltage at the chroma board if present usually about 2Vac something you will also noticed their is a light at the neck of the picture tube.
  7. if the 1000V is present the heater and the B+ supply voltage i'm sure the video will come out. i hope those steps that i give to you will help to fix your problem thanks for choosing the fixya if you have further question i'm glad to help you.

May 31, 2011 | Televison & Video

1 Answer

Zenith 27 inch text is blurry


This tv needed CRT Tube discharge.Take the tv aparts,take out the CRT video board,must plug it back in."Highvoltage becareful",find a wire with good insulations,grounded itself in with a screw from a steal frame.High voltage "Take that wire go close to the CRT tube without the video board connect in.Than u will hear a pop,that the highvoltage,just discarge ur CRT bad contamination.The tv should be clear now,after putting it back together again,getting it working.

Dec 30, 2010 | Zenith B27A11Z 27" TV

1 Answer

I have a Sony KV-36FV1. Do I need to discharge


Hi
No ,but make certain that set is unpluged from mains before removing back if you do have to removed the eht anode connector for any reason then discharge by inserting s screew driver blade with a wire and crock clip attached clip to braiding on crt bulb> if a fuse is blow find out why before replacing mighy be faulty diode or power tranistor.
regards windyhouse

Apr 03, 2010 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

RCA D52W20 has no anode cap (Discharge how)


On end of the red wire from the flyback to the top center of your CRT (picture tube) there is an anode cap. Get a wire clip and a long screw driver that has an insulated handle. Attach one end of clip wire to known ground on TV chassis and the other end to the screwdriver. Now carefully slide tip of screwdriver under the anode cap. You should hear a little snap. Now the CRT is discharged.

Good Luck, Big Irish.

Nov 22, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

1 Answer

WS-55819 Dump the HV!?


there will be to points on the CRT's hold a screw driver to each point and there should be a zapping sound! do this more then once give a few mins then do it again

Jan 24, 2009 | Mitsubishi WS-55819 55" Rear Projection...

1 Answer

How to discharge tube


discharging the tube by putting the screw driver to the anode cap. the driver is connected to the groud of the tube..in order to minimized the electric charge in the tube an for safety too..

Sep 01, 2008 | Sony KV-32S40 32" TV

1 Answer

Discharging A iMac....


Discharging the CRT is quite tricky and dangerous, it should only be carried out by a qualified mac tech.

Never work on a mac with the power connected!

The gear you need is safty glasses, ungrounded foam pad, needlnose pliars, wire lead with alligator clip at both ends and a CRT discharge tool (if you do not have a discharge tool you can use a insulated srewdriver attached to a wire lead with alligator clips on both ends)

Use one hand keeping the other behind your back. Do not touch anything with the other had while you are discharging.

Once you have taken off the casing connect the alligator clip from the lead to the ground lug on the all-in-one system. Then slide the discharge tool under the anode cap into the anode aperture. As soon as you feel the metal of the probe touching the metal of the aperture, the CTR is discharged.

Try not to leave the machine open for any lenght of time.

You can find more information on Apples knowldge base.

May 08, 2008 | Apple iMac Desktop

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32" RCA when plugged in snaps an arcs


Normally an arc or snap like that is coming from the anode cap that attaches to the top center of the crt. The voltage there is upwards of 25k so be VERY careful if you're going to inspect this for any faults. If it is the cap leaking unplug the set and take a piece of wire attached to a screw driver with the other end of the wire attached to the grounding cable around the outer edge of the crt. Gently undo the cap from the crt and allow the blade to sit in the well for a period of time to discharge the crt completely.
Next get some HV putty, sold at most electronics distributors like Mouser and form a small ring with it. Place it around the well hole in the crt and replace the anode cap pressing firmly to seal the edges of the cap to the crt. With the back still off plug the unit in and see if that's cured the problem.
Bill

Apr 05, 2008 | RCA 32V420T 32" TV

1 Answer

Toshiba 35


turn the tv off ,disconnect from power source , then you can
wait 1 hour appx. ,for the crt to discharge it self ,or you can
being very  carefull discharge the crt by inserting a long
screw driver under the ground strap that runs across the crt
(thats the metallic one ) the other screw driver under the anode
high voltage cap (thats the one that connects to the top center
of the crt) then short the two screw drivers together ,you should
see a little spark if there was any voltage there ,after that you
can solder  all the cold solder joints.
May I suggest that you check the main chassis also for cold solder joints.
I have checked many a TV.,and I always check the main chassis  to prevent callbacks.
BE SURE  NOT TO CREATE SHORTS WHEN YOU SOLDER
USE A 40 WATT SOLDERING PENSIL/IRON
TAKE YOUR TIME. YOU SHOULD HAVE NO PROBLEM.

Oct 23, 2007 | Toshiba 35A44 35" TV

13 Answers

How to discharge the TV tube?


First off there is no capacitor that holds the High voltage on the tube. Its the tube itself that stores the charge and if you dont discharge a tube properly it will bite you!!You can disconnect the 2nd anode of the tube(thats what the cup is called)that puppy can hold a charge for months as I've picked up used tubes that other service men may have striped out of a junk sets and still got zapped weeks later and it can burn a hole right in you if it bites you the right way. That metal strap is the ground for the crt(the picture tube) The proper way to saftly discharge a crt would be to take a screwdriver perferably a flat tip and connect a cliplead to the screw driver and clip the other end to the ground strap. Carefully slide the screwdriver up UNDER the cup on the crt till you reach the middle of the tube as you will feel it as it wont go any farther. In the meantime you might hear a pop sound and that would be the dischargeing of the tube.. Keep that screwdriver in place a min. of 30 to 40 secs. then remove . Then pinch the cup the oppisite direction on both sides that the wire is running as the cup is held in place by a small hooks on both sides Be carefull not to rip off the cup or bend the small hole suround that the cup is attached. And never ever poke a hole in the cup as I've seen peeps do and when you turn back on a set you will have fireworks as the high voltage will arch out all over the place and if your hand or face is close to it it will get you too!! Now take the clip lead and attach to the grounding strap and clip the other end to where you just took off the cup and your all set.Good Luck with your repair

Mar 16, 2006 | Panasonic PV-C2010 20 in. TV/VCR Combo

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