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Cracklin sound heard from neck of picture tube near socket just before shutdown

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  • tennis419 Sep 13, 2009

    Thanks that sounds like a logigal sulution one i think is worth trying. Will let you know if is a problem solver.

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My guess is this is a power supply problem. It is evident in audio, so it is a problem that effects the circuit. Thus, the main power supply is suspected.

Maybe the electrolytics in the ripple filter are gassy and developing a low impedance path to ground. That would account for the crackling sounds, mabye.

It is the kind of repair that any good tv tech should be able to do. The cost is not great; house call plus maybe $100 or so. That is my best guess.

Posted on Sep 12, 2009

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1 Answer

Prima tv takes long to turn on


Hello
If sound comes first, and picture comes after a long duration of time, the picture tube base connecting socket will have the fault. Replace it. This socket can be located on the abse card attached to the picture tube neck.
Image of the suspected part attached.3_13_2012_6_32_55_am.jpg

Mar 12, 2012 | Prima C2012 TV

1 Answer

My Panasonic CT-32SC14 takes about 5-30 minutes for the picture to be displayed, and the color is red hued/high contrast. Adjusting the color controls helps, but its not a great picture. The longer the set...


hi,
You have to check the picture tube base socket. After some years of use the contacts of the base socket will become bad (normally the screen pin and focus pin). Just replace the CRT socket it will solve your problem. You can find the CRT base socket on circut board at the end of picture tube neck. Pull the circuit board straight to back,do not shack. It will damge the picture tube pins.And replace the socket with the same type. You will get it from any of the electronic spare part shop near to you. Remember one thing remove the socket from the circuit and keep it with you as sample when you are going to purchase a new one, Because there are different types of CRT sockets are avilable. Purchase one which is similar.
ok

Jul 07, 2011 | Panasonic CT-32L8 32" TV

2 Answers

Our 21" panasonic television is when turned on,


Hello

It is due the fault of its picture tube base socket. Picutre tube base socket can be located at the picture tube card connected at the neck of the picture tube. It is the socket that connects the picture tube pins to the circuit. It can be resoldered out and can be replaced.
Open your tv. Locate the picture tube base card, can be seen connected to the picture tube neck. It is pluged on to the picutr tube, and can be pulled out of it. Be sure not to make any tilt of shake while pulling it out. Just pull it back straight, may have to apply some backward pulling pressure. Resolder it out for the board and go for a same type and number. It can be available at most of the electronc sparepart shops. Replacing it will solve your TVs problem. OK
If you need furthermore asistance, feel free to get me through Fixya.

Dec 22, 2010 | Panasonic TX-29S90X TV

1 Answer

Pix is dim and too big for screen


Hello
Your TVs focus voltage has some trouble. You gets an out of focus piture now. There may be two reasons for this fault. The first one is, the focus pack trouble. The second one is picture tube base socket trouble. Both are repairable.
Focus pack is integrated with Line Output Transformer [LOT], and picture tube base socket is soldered directly to picture tube base card. You just open the TV and check whether there is any "Shhhh" sound comes from the neck side of the picture tube while tv is working. If it is so, you will get a smell of Ozone gas also. If it is so, switch off the set and unplug it from mains socket, pull out picture tube base card from the picture tube neck. Be gentle, and not make any shakes while pulling it out. The neck part of the picture tube is very thin relative to its other portions of the picture tube, and have a chance to break. So be carefull when you pull it out. You can see the base socket soldered directly to it. There will be two wires also, for some sets only one, attached to it. Normally the red wire going to a slot in the socket is focus wire, through which focus voltage reaches to the relative pin of the picture tube. Just detach the wire out from the socket, desolder it out and go for a similar type, and pin confuguration. Replacing it will solve your problem. After replacing the picture tube socket, a slight focus adjustment may be needed. Sometimes may not. The focus voltage can be adjusted. Its adjustment control is located on the above said [LOT]. There will be two adjustment controls, marked Focus and Screen. Out of which the upper one is for focus adjustment, and the lower one is for screen adjustment as its markings states. You just adjust the focus control very little, while watching the picture on your tv screen. Take menu display for reference, rather than moving pictures for focus adjustment, so that you will get a stationary image for reference.
The second stated trouble is related to the screen-focus pack integrated with the [LOT] itself. If it has got damaged, there is no other way than replacing the [LOT]. If so desolder it out from the circuit board, after detaching the anode cap from the top of the picture tube,and focus and screen wires. Before detaching the anode cap, care must be taken, as there may be some extra high tension voltage charge on the final anode of the picture tube, which is dangerous. You must discharge it before unpluging it, otherwise you may get electric shock from it, even after the Tv is switched off and unpluged from the wall socket. The charge may retain there for hours. So be careful.
If you have any more doubts, inform me through Fixya. Ok.

Nov 05, 2010 | Sanyo DS24424 24" TV

1 Answer

Turn tv on the the morning has sound but no pic until tv warms up (about 15-30 mins)


Hello
Your TV has CRT socket problem. This is due to the improper contact of that socket to TVs picture tube. All TVs picture tube [otherwise says as CRT means Cathode Ray Tube] is connected with the remaining control circuit wia a picture tube base card, which can be located at the extreme back side of the picture tube. It is plughed in to it via a socket, and that socket is directly soldered to the base card. The socket mentioned above is faulty. This fault will be more at rainy and winter seasons. During these seasons, your tv will take more and more time to display picture. Because, during this seasons, humidity in the atmosphere is high.
Here replacing that CRT Socket is the only remdey. For that you have to open the back cover of your tv. Locate the base card, can be seen at the back of the picture tube neck plugged in. Unplug it with care, not to damage the picture tube neck or its pins. Do not apply high pressur or sudden jerks. It may break the neck of the picture tube as it is very tender with respect to the other parts of the picture tube.
Desolder the socket from the base board, it may have 9 to 12 connections to be desoldered. Take it out, and go for the same type number and pin confugaration. Replace it with the new one.

NB: Keep children away from you when you do this work. Be sure to unplug the TVs power chord from the wall socket before attempting to open it. Keep out all the connections to the tv, and make it idle. Ok

Oct 19, 2010 | RCA F27442 27" TV

1 Answer

Sound no pic. after on for 20min then turned off back on and pic. now it will not get pic just sound


Your TVs CRT socket is faulty. CRT socket is one that connect the base of the picture tube, and can be located on the base card of the tv. It is soldered directly to base card and can be replaced. Unplug the base card from the picture tube neck [Caution: never damage the neck of the picture tube. Only slight pressure should be applied], desolder it out and replace it with a similar type.

Oct 16, 2010 | Norcent Technologies2703 27" TV

1 Answer

I have 20 inches tv there is a sound but no picture,it so dark picture


Since you say dark picture visible, then : Brightness control setting!

Check the resistors on the neck PCB. If you find the resistance value of these resistors high, replace them.

If No EHT is found then also there won't be a picture visibility.

1. Open the back cover and see whether you can observe a faint filament glow in the picture tube neck, close to the picture tube socket.
If there is no glow E H T circuit failure.

2. If the glow is observed check picture tube grid voltages grid no. 2. as said above.

( the points referred above are all for technical people)

Oct 15, 2010 | Televison & Video

1 Answer

My t v sony tritron when I swicth on the picture doesnt appear but sound is o k . Please let me know what could be the problem.Any service station in bannerghatta road or near by?


Hello,

If everything else works - there is sound and high voltage (static on the screen) - but there is no picture (including no on-screen menus), this limits the likely area of problems is the video output circuitry or CRT filament connections. Check to see if the CRT filaments are glowing. If they are not glowing, check for bad soldering on the CRT neck board and around the flyback transformer.

Where the picture is erratic - coming and going entirely or changing brightness suddenly, with power off, remove the picture tube socket (carefully!) and clean the pins with fine sandpaper and use contact cleaner on the socket. This source of bad connections can result in a variety of erratic symptoms. Check for bad solder connections on the CRT neck board.
Good luck...

May 27, 2010 | Televison & Video

1 Answer

TV POWERS UP WITH SOUND BUT NO PICTURE


Hey John I'm from Tas so not far away from you. If the sound is working the most common problem for a tv is that the voltage to the heaters on the tube is missing. Heat generally kills the caps on the neck board or further down in the supply. To verify this you can lift the back cover and have a look at the neck of the tube in a dark room you should see an orange glow inside the neck near the neck board. Hope this helps.

May 07, 2009 | Televison & Video

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

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