Question about Panasonic PV-C2010 20 in. TV/VCR Combo

13 Answers

How to discharge the TV tube?

Is there a proper way of discharging the TV to make it safe to work on and remove the main board (not the tube board)? I can see exposed metal wires going across the tube, but the tube does not really have a metal surrounding frame that is that visible (covered with plastic case). What do I need and what is the procedure for discharging a tube, and when will I know if it's safe to remove the thick black wire going from the board to the rubber suction cup on the tube, so that I can remove the board and work on it? Thanks

Posted by on

  • 5 more comments 
  • John Smith Mar 17, 2006

    Huh?

    That is not true. The tube can hold lethal charges for months and even years.

    Does anybody else have a more informed and educated answer?

  • John Smith May 02, 2006

    Techman,
    Your solution is excellent and worked fine. When I did it, I heard nothing at all. The TV was unplugged for about 4 months though.

    After probing with the screwdriver for several minutes (not having a clue how the clip looks and if the screwdriver was touching the clip) I felt confident to remove the suction cup with my hands.
    Low and behold, the tube was discharged and I didn't get any shocks. I removed the PCB and now I am looking at replacing some capacitors.

    This is my problem:
    A ~2" black bar appears at the bottom of the
    picture and the remaining picture on top of that is compressed
    (squashed) vertically.

    I was told to change the electrolytic capacitors in the vertical output section. Do you think this is the proper solution? The TV is actually a 1992 Panasonic PC-29XF10A (I wasn't able to find that model # on the site)

    Have you ever experienced such a problem?

    Have a look at the section in general. This is the vertical output chip (weird package) on the heatsink.

    Thanks

  • John Smith May 02, 2006

    Here's another pic from a different angle.

  • John Smith May 02, 2006

    The chassis # is: YAPEDP218

    The TV was bought in Canada, and I tried contacting Panasonic for the schematic and they said they don't carry the PC-29XF10A model anymore.

    I'll change all the caps that are circled (especially the ones you mentioned outlined with a dot).

    I'm not too sure about the cap in the flyback transformer section. I'll have to have a look at that when I get home tonight. Maybe I can post a pic and you can help me identify it as well.

    Also, there's a couple tantalum caps around the vertical IC chip, think I should change those too while I'm at it?

  • John Smith May 05, 2006

    Hey techman,

    Those caps fixed the problem. TV works great now... except for one thing.

    Is there any way to get rid of the high pitched hum/whistle that fades in and out every few seconds? It's really annoying. What is the cause of that, and what is the recommended solution?

    Thanks again.

  • lealen Sep 06, 2008

    Have Panasonic model PC-29XF10A 1992 Tv All Ihave is a horizontal line accross the centre of the screen sound OK.Stan.

  • Anonymous Apr 11, 2009

    It is true that TVs are dangerous to work on and require a skilled engineer, but I will work on a TV (using my basic soldering skills and understanding faults) when the TV engineer refuses to repair the set.


    It annoys me when they refuse purely because they believe it is too old.



×

Ad

13 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 3,130 Answers

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

Posted on Apr 11, 2006

  • 1 more comment 
  • Larry  Dillon
    Larry Dillon Apr 30, 2006

    Have you read my post????? WEll?? Go ahead!!

  • Larry  Dillon
    Larry Dillon May 02, 2006

    yes sir . In the past I have repaired this chassis but I dont have a schematic. Are you sure you got the right model #.. Do you see a chassis #. I reconize trhis chassis as one I repaired not long ago. You see the first picture you sent?? Theres the small end of the heat sink theres a small electrolitic cap wheres theres two bigger ones right on top. well its that smaller one then the one on the diagonal left then the next diagonal left one right above that one too. Now theres another one you gotta replace too. ite right off the flyback transformer and it will have the same c400seris or c500 seris of capacitors that the other vert caps will have . Do you understand what i mean?? Good luck and if you can please report back and let us all know how it went please. Good Luck.

  • Larry  Dillon
    Larry Dillon May 05, 2006

    Great Glad to hear this!! Ok that high pitch noise is the flyback(high voltage transformer) or the deflection yolk arund the Picture tube. The fly squeal you cant do much as I've tryed lots of things and nothing seems to last except replacement. No the deflection yolk noise or buzz can be minumized by pushing pop cycle stick up under neathe the coils but you gotta be very carefull as theres alt of voltage there. if you put on the back is it really bothersome?? s its best not to try to fool with thes devices. Ok also another coil on the PCB could be making the ringing noise also. Listening very close and tracking down its location may help you decide on where the problem lies/.. Good Luck

×

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 50 Answers

Hi! First of all, If you don't have any technical training, I advise you to take it to a shop for repair, but the old way to discharge the tube is to take a long screwdriver, connect an aligator clip from the steel shaft to ground on the chassis, then making sure you hold the plastic handle of the screwdriver only, slide the end of the screwdriver under the suction cup on the tube, you will feel it hit a metal clip, and if it is still charged, there will be a loud "snap" as the tube discharges to ground. Again, I must stress this can be very dangerous, and I don't recommend you do it, but if your going to work inside the set regarless.... then this procedure should make it safer for you.

Posted on Apr 10, 2006

Ad
  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 286 Answers

People should not be commenting on jobs like this unless they do this for a living.

The only time you need to discharge the high voltage left in the high voltage anode on the CRT is if you need to remove the high voltage flyback lead from the CRT. If you do, don't use a screwdriver and a clip as most places tell you. I have seen the voltage jump over the handle of a screw driver. If you are an amateur, then put a nail in a piece of wood (at least two feet long). Connect an alligator clip to the nail and the ground ******** the back of the CRT. Slide the nail under the anode cap. Move it around to discharge as much as you can. Make sure you only hold on to the wood. As someone mentioned, the one-hand-rule tells you to hold one hand behind your back while you do this just to be safe.
If you are starting to do this for a living, use your high voltage meter to discharge most of the voltage. Then you can use the screwdriver and alligator clip to remove whatever is left.
You are lucky that your TV was unplugged for so long and most of the voltage dissipated.
It's also a good idea to discharge the main filter capacitor in the power supply if you need to work in the primary section. Use a 10K resistor connected to an alligator clip which is clipped to the ground side of the capacitor. Handle the resistor with a good pair of insolated pliers. Do not use the chassis ground since it is for the secondary circuit, not for the primary (assuming you have a switching powersupply in your TV).
Congrats on repairing the fault in your TV. Well done. The ringing you are getting may be the flyback, but is most likely caused by one of the coils. You can tell which one it is by running the TV and using a wooden ruler to touch each coil. When you find the right one the pitch will change as you move the coil slightly. This MAY be solved by replacing the coil, glueing the coil to the chassis, replacing any capacitors connected to the coil, or in the worst case scenerio removing the coil, soldering wires to the coil leads, mounting the coil to whatever is handy using plastic ties and then soldering the wires into the holes the coil went in. Make sure you insulate the coil leads well with electrical tape or heat shrink tubing. This may sound extreme but it is a solution provided by a manufacturer to our shop to solve a similar problem.
Make sure you observe the polarity of the coil as you did with the capacitors. Most coils don't have a polarity, but some (such as linearity coils) will have a stripe down one side and a mark on the main board. If you get this wrong, you may notice the horizontal linearity is wrong while viewing a picture.

Posted on Nov 04, 2008

  • bubinohio Sep 08, 2013

    do u have a video on how to correctly discharge a tv??

  • bubinohio Sep 08, 2013

    Add a Commentim new to this and love to scrap but i want to know how to discharge all tvs before removing copper out of them

×

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Hi.. what we usually did , here in Indonesia, we trying to discharged the high voltage to the ground on main PCB, and what we need is just using a cable with aligator (big enough to clip a screw driver) and flat head (-) screwdriver, but make sure to disconnect tv ac plug from wall and make sure you clip to Ground (on Main PCB)like tuner metal chasis and clip the other side of clip to screw driver metal (longer screw driver is best)and trying to touch the metal connector inside the suction cap on the tube, if its just turn off a few minutes and disconnect from ac wall unit, you'll be able to hear "crack" sound when you already touch the metal connector, and leave it for 3-4 second, and trying to touch it again 2-3 times to make sure the high voltage already discharged, and you are safe to plug out the rubber suction cup from the tube. Bonie

Posted on May 02, 2006

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Leaving it unplugged for three days or even three months DEFINITELY WILL NOT DISCHARGE THE ELECTRICITY. You must discharge it to ground like the other people suggested. NEVER attempt repairs on CRTs without PROPERLY discharging the juice.

Posted on Mar 25, 2007

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

Waiting 3 days for the tube to discharge is not bad advice but I would'nt trust it...the pic tube can hold a charge for quite sometime. You don't need to disconnect the red high voltage lead to work on the chassis unless it's so short that you cannot remove the main board. Here's how to discharge the tube...carefully slip a flat screwdriver under the rubber cup until it touches the center connector. Now take a clip cord and fasten one end to the screwdriver and touch the other end to the outside black surface to the tube..if it's charged up you will get a spark..then wait a minute and touch it again. After you remove the board for repair place the tv's cover over the set to protect the tube. Don't leave it open because you might bump the neck of the tube and crack or break it.

Posted on Apr 30, 2006

  • karen johnson Aug 31, 2012

    What if I just want to replace the red tube? Do I need to discharge it? Also, how do I remove the main wire from the tube to the voltage line?

×

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 26 Answers

I have a samsung projection tv model no.pcj522r
No video, getting getting tick sound...I was told that the board the capacitor sit on is bad, any idea how to discharge it being that this TV does not have the conventional picture tube
it has 3 seperate board

Posted on Mar 18, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I am planning to work on my Magnavox TV (model 25TR12). All I have read about discharging of the high voltage is to connect one end of the alligator clip to the metal chassis. Since the modern TV have no metal chassis, what should be done?

Shinto

Posted on Nov 05, 2007

Funny, nobody mentioned that while you discharge the tube like techman explained, you got to hold your free hand in a fist behind your back. IF you do get a shock, it won't go through your hart..

Posted on Jun 08, 2007

Yeah ive been trying those procedure and it is safe connecting to the cup and then to the ground chassis and you heard a spark on it indecating that the picture tube is discharging.

Posted on Feb 09, 2007

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Sony - kv-28wf1u - tv switched off to go to bed wednesday night. switched on thursday night - went to standby flashing mode. Switched on & off several times before it would work. Friday night switched on & off - went to stand by flashing mode. Nothing worked.Power & signal ok.

Posted on Feb 20, 2010

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I used uninsulated wirepliers but was smart and held them with wet newspaper.I now play cello in gods choir.

Posted on Nov 09, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hi the proper way to work on the TV IS AFTER 3 DAYS THAT YOU UNPLUGED IT FROM THE WALL the capacitor will discharge itself you can check it by measuring the voltage on the board or just connect the legs with a long screwdriver good luck windman

Posted on Mar 16, 2006

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 298 Answers

SOURCE: tv tube

The best,and safest way is to use HV Probe
specified at least 40KV This is a direct link to
give you an idea of what it is you can search
for a better price on the Internet
http://www.mcminone.com/product.asp?product_id=72-6530&catalog_name=MCMProducts

Posted on Nov 16, 2007

  • 4234 Answers

SOURCE: safely disassembling a tv

The tube is the most dangerous part. It contains a vacuum and also a very large charge. The easiest way to make it safe is to unplug the end by removing the pc board attached to the back. Once removed, you will notice a large round plastic "pin" that is keyed. With a pair of pliers, squeeze the end of that part. This will break the end of the tube and allow air to enter. Do this carefully and only break the very end of this glass part (indide the plastic). You will hear the air enter the tube. This will effectively remove the charge at the same time.

Dan

Posted on Apr 02, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Sanyo DP58D33 has no picture but has audio


This can be from your main board or your power supply unit. To test which one is bad simply try putting your volume up or down while the TV is on. If the volume changes it is most likely your power supply unit, If nothing happens then it is most likely your main unit. Both are available here: 1LG4B10Y11900 Z7GB Sanyo Power Supply Unit for DP58D33 1LG4B10Y117000 Z7GB Sanyo Main Board for DP58D33

Apr 21, 2014 | Sanyo DS24425 24" TV

1 Answer

How to disconnect main board in toshiba model 32a40 in order to check solder points


It can either be held in with screws on the bottom of the set, or in the set itself. It could also be held in with the plastic of the chassis that has clips on the bottom. You would usually pull the chassis and remove it from the holes. They are kinda L shaped. Be careful not to yank any wires. I would discharge the tube and unhook the neck board and the anode cup to make sure you don't yank those. Please use extreme caution when discharging a tube.

Oct 28, 2012 | Toshiba 32A50 32" TV

2 Answers

Start up get no signal detected blank screen


Check cable to video card. Re-connect. Try re-seating video card. Make sure monitor is in correct mode like VGA, DVI, or HDMI.

Aug 25, 2012 | Acer Aspire All-in-One Desktop PC - Silver...

2 Answers

I have vp50HDTV20A HDTV PLASMA TELEVISION The


Good day sir Thor!!!!


I already encounter that kind of problem many times..It looks like all normal even the green power light is not blinks or change to red or amber color but still no sounds or picture on TV..

Sometimes it will happen to plasma TV in all brands and model..It cause of faulty main board..

This is the sample picture of main board of your unit..Part # (3850-0142-0150)

2_28_2012_11_02_53_am.jpg
You can order this parts here:
http://premiertvparts.com/index.php?main_page=product_info&cPath=1&products_id=797


http://www.ebay.com/itm/NEW-VIZIO-VP50-HDTV20A-MAIN-UNIT-3850-0142-0150-2A-/320737894046

http://tvpartsfast.ecrater.com/p/12695612/vizio-3850-0142-0150-main-board-for-vp50hdtv20a

http://modulesrus.ecrater.com/p/11497716/vizio-main-a-v-3850-0142-0150

Just replace the board to fix your TV and it works again..

Note: When you install the board make it sure that the static energy on your body discharge to ground to avoid corrupt of main board IC..

EXAMPLE: open the cover then find the main board..before you do that make it sure you hold the metal portion of your TV to discharge static after that you can now freely replace the board and also make it sure to memorized the connector to avoid damage to make it sure take a picture on it before unplug connector for future reference in case..

again discharge static please!!!..Only few tech or other people know this that's why when they install new boards its not works even it is new..I discover this base on my experience and study..

Hope it helps..

Please don't forget to rate!!!!

Thank you using fixya..

Feb 28, 2012 | Vizio P50HDTV10A 50 in. Plasma HDTV

2 Answers

No picture but with sound


There are three things you should try. If you can safely pull the back cover out safely, do so. First thing to look for,is the suction cup attached to the picture tube securely? Be sure that it is. Make sure the TV is not plugged in, when you check for a good ground to the Tube (suction Cup). Then plug the TV in and power up. Still no pic? If you feel that this is not the problem, next, pull the board out of the TV. Be sure to discharge the picture tube before you remove the suction cup. Unplug the TV. A wire taped to a flat screwdriver, the other end of the wire connected to the silver braid that surrounds the picture tube. Now slip the screwdriver under the suction cup, you will hear a snap, you have discharged the tube, you may remove the suction cup. And you may pull the board completely out of the TV. Find the vertical IC and resolder the 7 or 9 pins. Do not use excess solder and short the pins together. Each pin must soldered individually and not together. Check for bad solder grounds on the horizontal transformer. This transformer is usually a small square box with five or six pins. When not soldered with a good ground, it will crate the problem you describe. Next, solder the pins on the Flyback Transformer. Resolder any and all power resistors. A power resistor is one of two watts or more. I do not believe your horizontal transistor is bad in this case, you resolder this as well. A bat transistor would hand you a dead TV. Do go over the rest of the board and really look close for any and all bad solder grounds, solder as necessary. Last be sure you have good solder grounds on the back of the small board that connects to the picture tube. I'm sure you will get your picture back, try all of the above and let me know how things go. Thanks for asking and show all hands of support!

Jun 23, 2011 | Sharp 27R-S50 27" TV

1 Answer

Picture went completely fuzzy. What could the problem be?


The tv CRT( picture tube) have a radiaton posion infected in ur tv picture tube.This is how u discharge the CRT(picture tube) get the posion out.Take the tv back cover off.Take video board that connected to the CRT(picture tube) out.Plug it in,so u have a live current to the CRT(picture tube).Find a wire like an AV cable,should be find.One side of the metal,grounded to the metal frame somewhere.Take a long needle plier grab the other side of the AV cable wire,not the metal,(Caution high voltage live current).Come very close to the open CRT(picture tube).U will have a live current arc,than u,will hear a big "POP".U,just discharge the CRT(picture tube).The tv now the CRT(picture tube),now it good,it clear of posion infected in ur tv picture tube.Now,unplug ur tv.Put ur tv,back together.Hook up ur tv signal cable and plug in ur tv,now ur tv picture,will be clear,completely.I do this many times to dicharge fuzzy CRT(picture tube).When i was a tv Tech.for the SONY TV Corporation.

Oct 12, 2010 | Sanyo HT32546 TV

1 Answer

Safely disassembling a tv


The tube is the most dangerous part. It contains a vacuum and also a very large charge. The easiest way to make it safe is to unplug the end by removing the pc board attached to the back. Once removed, you will notice a large round plastic "pin" that is keyed. With a pair of pliers, squeeze the end of that part. This will break the end of the tube and allow air to enter. Do this carefully and only break the very end of this glass part (indide the plastic). You will hear the air enter the tube. This will effectively remove the charge at the same time.

Dan

Apr 02, 2009 | Panasonic PV-C2010 20 in. TV/VCR Combo

1 Answer

How to discharge capacitor


Most projection set will discharge them selfs to a safe level just after you unplug it. But being there are litterly hundreds of capacitor in this set you might want to describe the problem you are having before you gut the set

Mar 19, 2008 | Samsung PCJ522R 52" Rear Projection...

1 Answer

Convergence Problem, need to replace the PC board


Hi!
see this site
Picture Tube Discharge First of all, If you don't have any technical training, I advise you to take it to a shop for repair, but the old way to discharge the tube is to take a long screwdriver, connect an aligator clip from the steel shaft to ground on the chassis, then making sure you hold the plastic handle of the screwdriver only, slide the end of the screwdriver under the suction cup on the tube, you will feel it hit a metal clip, and if it is still charged, there will be a loud "snap" as the tube discharges to ground. Again, I must stress this can be very dangerous, and I don't recommend you do it, but if your going to work inside the set regarless.... then this procedure should make it safer for you.

Feb 11, 2008 | Panasonic PT-53WX53 53" Rear Projection...

1 Answer

Tv shuts off - sony kv-32v40


They are very relevant because you might have a high voltage ark from the output transformer or a shorted picture tube,the ark or high voltage leak you might not see but the shorting of the picture tube you will when it does it,being careful remove the back cover and leave the back open,turn the tv on and wait for the moment the shutdown takes place and look at the neck of the picture tube and thru the glass of the tube you might see the moment it shorts out and the set shutsdown,if you see something in the neck of the tube is because the tube is bad,take a look at the conections in the crt board maybe one of them is loose,the arking or leakage from the output transformer is dangerous and it should be observed from a safe distance(10 feet),if you notice something in the output transformer he will need to be replaced,both situations involved high voltage areas and if you are not too familiar with tv service you should get the assistance of a servicer.It is a good idea to resolder the main board if the two possibilties do not show or when the main problem is corrected.Let Us know how it goes or if you need more information.

Oct 31, 2006 | Sony KV-32V40 32" TV

Not finding what you are looking for?
Panasonic PV-C2010 20 in. TV/VCR Combo Logo

22,542 people viewed this question

Ask a Question

Usually answered in minutes!

Top Panasonic Televison & Video Experts

 Grubhead
Grubhead

Level 3 Expert

5554 Answers

Demonic-2011
Demonic-2011

Level 3 Expert

509 Answers

The Knight
The Knight

Level 3 Expert

75846 Answers

Are you a Panasonic Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...