Question about KLH 13" TV

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Focus wire from flyback transformer lost position?

I was repairing this tv, long story short, the focus wire from the HV flyback, got disconnected and now i cant find where on the yoke circuit it was connected too. anybody have any ideas???

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  • R E Dec 22, 2008

    thanks but i cant find where on the crt board its supposed to go to, like the specific location as i dont c any holes missing, ive been searching the crt board on the neck for a half an hour

  • R E Dec 22, 2008

    thanks that was it, a socket!

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  • KLH Master
  • 5,138 Answers

Yes, yoke plug in should be next to or behind FBT.

Posted on Dec 22, 2008

  • ladywinn
    ladywinn Dec 22, 2008

    Focus wire goes to CRT board on neck of tube.

  • ladywinn
    ladywinn Dec 22, 2008

    There on crt board is socket you connect on Picture tube focus plugs into hole on socket.

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MY TV PICTURE HAS GONE A LITTLE DARKER AND ADJUSTING BRIGHT, CONTRAST, COLOR,ETC. DOES NOT HELP


How long u have this RCA analoge tv?Around 10 years or more and used it like about 5 or 6 hrs everydays?Yes,than ur tv it is losing CRT tube radiation cohetion.As times go bye years in years out the tv CRT-(tv tube) radiation will slowly dying out,Tv actual pictures will lost some of it luster and it brightnesses to the tv auctual pictures.Brightnesses of CRT tube will get darker and darker until the tv actual pictures barely it is watchable anymore.Contrast,Brightness and Colors adjusting more will help some.But u have to take this tv aparts and take a Flat scerw driver turn up a little bit more of the tv HV-(high voltage) SCREEN button on the FBT-(flyback transformer) to make any big differences of the CRT tube brightnesses.The FBT-(flyback tranformer) is the big block of plastic with a red wire with a black cap hook up to the tv CRT-(tv tube).This adjustment on of the FBT,HV-SCREEN button will help the tv CRT-(tv tube) last another year or two.

Aug 16, 2011 | RCA TruFlat 27F520T 27" TV

Tip

Diagnosing and repair of TV High Voltage problems.


Your TV is dead or perhaps the turn on relay clicks and immediately clicks again, followed by your standby light blinking a specific code. For each TV the code is different. To find out your code google "(your brand name) error codes". This should return the listing of codes for your unit. Check the code to see if it is the high voltage section with the problem.

The hardest working section of any TV is the high voltage section. This does not apply to flat screens and DLPs only CRT projection units and conventional direct view units. The flyback get hot and is made of many windings of very thin wire which is only shellaced to insulate it. Over time the windings coating breaks down and the windings short together. This can happen in as little as several years. Once shorted there is less resistance and the current being pushed through the flyback increases. This overloads the Horizontal Output Transistor which gets hot and fails. This in turn causes the low voltage power supply to detect the overload and not allow the unit to start up, giving you the error code blinks.

The flyback is generally near the rear of the unit and is cylindrical with large rubber wire or wires if projection coming out of it and going to a rubber cup on the CRT or CRTs. Near the flyback will be a large heat sink with a large transistor mounted to it. With the set unplugged check the HOT with a DMM on diode scale for resistance. The leads of the HOT should be marked on the circuit board (C= collector, B=base,E=emittter). If the HOT has 0 resistance between all the leads it is shorted and you need to replace both it and the flyback.

You should be able to obtain both parts at http://www.encompass.com or http://www.shopjimmy.com . Unsolder both parts and remove from the board. When installing the new HOT be sure to clean off the heat sink and apply new heat sink compound available from the parts supplier. The flyback also will have two additional wires to remove and replace. One goes to the CRT board and may plug into a plastic box on the CRT jack or be soldered into the board depending on the model. This process should be self explanatory if you study it a while.

Depending on whether you have a projection TV or a Direct View TV the procedure is a little different. I will describe the procedure for a direct view TV first.

The 2nd anode lead (large red rubber wire going to the CRT) is plugged into the CRT and may have 48 kilo volts on it! Discharge the potential to the ground strap (bare wire going around the CRT) using an insulated screwdriver and a wire with gator clips on each end. If the CRT was storing power there will be a spark and loud snap when you make contact. Once discharged the tube is safe. Pull back the rubber boot and remove the wire from the hole in the tube. Install the new flyback wire. Solder the new flyback to the board reassemble everything and turn on. If you were successful the unit will start. You will need to set the focus and screen drive using the two potentiometers on the back of the flyback. Top is focus, bottom screen drive. Turn up the screen drive to get a picture. Tune to a channel with text. Turn focus to get the sharpest image. Tune to a channel which has both black and white in large amounts. Turn up screen drive until the black just begins to light up or starts looking gray then back it off slightly and you should be done with the unit. Be careful while adjusting the flyback as the set will have lethal voltages in it.

Now for the flyback on a projection TV. It will have 4 large rubber wires coming out of it. If the new one came with wires they should be removed at the HV divider block (located at the front of the set normally, just follow the wires to their end) if not they should be removed at the flyback. To remove at the flyback, which is the most common hookup, slide the rubber boot off the post and using needle nose pliers pry the cable out. It should have a bare end which connects to a clip at the bottom of the new unit. Do them one at a time to avoid getting them wrong. When done you may have to adjust the focus and screen drive but it will be on a separate box called the HV divider block usually near the front of the unit behind the grill. Same process as listed above for the direct view set. If your unit still does not run you may also have to replace the HV divider block. All safety rules apply here also.

That should conclude the repair and if successful your set will work. If the unit still does not work go to my tip on troubleshooting at http://www.fixya.com/support/r4425277-basic_direct_view_tv_troubleshooting which explains the basic troubleshooting method to find any problems in standard televisions.

Thanks for using FixYa.

hardrocko

on May 23, 2010 | Televison & Video

1 Answer

No pix/sound, just high pitched whistle


Ur tv the high voltage it dead,the FBT,the flyback transformer.The big black block of plastic with a red wire with a black cap that hook up to the CRT(tv tube) is dead.The FBT,flyback transformer needed it to be replaced to solved this problems.Call the shops,take estimates for the best deal to do the repair.This is one of the main part of the tv to put HV in CRT(tube tv).It pretty hard to find this FBT these day,because of the discontinue of making of Amalog tvs.

Jun 06, 2010 | RCA 35V432T 35" TV

1 Answer

My tv is blurry. how do i get it to clear up? I


CRT tv's have a FOCUS adjustment on the flyback transformer. There may also be a "screen" adjustment on it, but you DO NOT want to turn that one.

You would have to open the tv, and take an INSULATED TOOL and turn the little adjustment labeled FOCUS or F on the flyback transformer, which is the large (usually black) thing that makes the high voltage for the CRT. It can easily be found by tracing the large red wire that has a suction cup at the top of the tube in the back. This wire goes to the top of the flyback. the focus is usually on the side of the flyback.

IMPORTANT!!!!

You must be very careful when doing this. Use a mirror to see the front of the screen while adjusting, don't reach around! Since this is the part of the TV that has LETHAL voltages you must be VERY careful not to touch anything else, since this must be done with te set turned on and warmed up.

Jun 10, 2009 | Samsung Televison & Video

1 Answer

My tv has no picture or sound. it makes a sound like its about toi come on but it doesn't. a red light just flashes


The Horizontal Output transistor needs to be changed as it is most likely shorted. The current transistor on this set is a 2SD3402 (no longer available) it's new replacement part number is the 2SC5902.
Order 2 2SC5902 Horiz Output transistors.Replace the transistor by it self once and if all is ok then fine.
If not replace it again and also the the Flyback HV transformer. The HOT transistor is probably shorted again and the transformer is causing it.

Dec 21, 2008 | RCA 32V550T 32" TV

1 Answer

I have a Zenith C27A24T the picture is out of focus.


If there is no other problem, he probably touched the focus adjustment in the back of the set. Open up the back and locate the flyback transformer (part with large red wire coming out the top). There will be 2 adjustment controls on it. One should be labeled screen, the other focus. Adjust the focus until crisp.

Dan

Sep 04, 2008 | Zenith C27A24T 27" TV

1 Answer

TV HV


usually when thiers arching its usually inside the flyback connection that causes the arching.I reccomend changing the flyback.

Apr 13, 2008 | Televison & Video

2 Answers

My tv rca


there is loose contact on the high voltage section in your tv.what you are going to do is open it,and reheat  with soldering iron and a piece of soldering lead the video chroma section and the high voltage section,near the flyback

Oct 23, 2007 | RCA 32F531T 32" TV

2 Answers

Sony 36XBR450


ditto bad flyback

Dec 05, 2006 | Sony KV-36XBR450 36" TV

1 Answer

Blurry screen GE 25GT511


hi There shouldnt be much in the focus system to go wrong as really there is nly the tube base and the flyback transformer. The usual for a TV is the tube faulty so its beyond repair. You could try the focus control, this will be on the flyback transformer. Back off TV, look for a heavy lead going to the dome of the tube at centre top and with eyes ONLY follow that back to the flyback transformer. On the side of that transformer is 2 screws, one near the top is the focus control. You will need a screwdriver to turn it and it usually has a seal to be broken. That will turn from say 8 o clock to 4 o clock no more, turn it up clockwise, try both ways. if it almost fixes but not quite it would be the tube. good luck

Mar 21, 2006 | GE 25GT511 25" TV

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