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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Monitor display is fuzzy and pixelated


Hi.

Focus voltage on the CRT is usually in the range of 2-8 kV DC and should be controllable over a fairly wide range by the focus pot - usually located on the flyback or a little panel in its vicinity:

If adjusting the pot results in a position of acceptable focus, you may be done. It is not unusual for the focus setting to drift a over time.

If the setting is already as good as possible but not really good enough, the CRT may be tired. Alternatively, the filament voltage may be too low. Check for bad connections in the filament circuit.

If the optimal setting is out of range of the focus pot, the problem is likely leakage in the focus divider in the flyback or one of the components on the CRT neck board.

Also see the sections: "Focus adjustment" and "Focus drifts with warmup".

The focus wire usually comes from the flyback or if the general area or from a terminal on a voltage multiplier module in some cases. It is usually a wire by itself going to the little board on the neck of the CRT.

If a sparkgap (a little 2 terminal device with a 1/8" gap in the middle) is arcing with power on, then the resistive divider has shorted inside the flyback, focus board, or HV multiplier - whatever you TV has - and the this unit will need to be replaced. Ditto if the SCREEN control affects focus and/or vice-versa.

Using a suitable high voltage meter (range at least 10 kVDC, 1000 M ohm or greater input impedance), you should be able to measure it connected and disconnected. The ground return will be the outside coating of the CRT which may or may not be the same as the metal chassis parts. If the voltage is very low (less than 2 kV) or too high and the pot has little effect:

When measured right off of the source disconnected from the CRT neck board, then the problem is probably in the focus network in the flyback (or wherever it originates). Sometimes these can be disassembled and cleaned or repaired but usually requires replacement of the entire flyback or voltage multiplier. Note: you may need to add a HV (10 kV) capacitor between the focus wire and DAG ground to provide filtering so you get a DC level for your meter.

When measured with the focus wire attached to the CRT neck board with the CRT connected but reasonable with the CRT unplugged, there is probably a short between the focus and another electrode inside the CRT. See the section: Rescuing a shorted CRT.

When measured with the focus wire attached to the CRT neck board with the CRT unplugged, there is likely a component on the CRT neck board that is leaky or breaking down. Also, check for decayed (tan or brown) glue which may turn leaky with age.
Good Luck...

May 30, 2010 | Computers & Internet

Tip

How to diagnose and repair Projection 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 gets hot and is made of many windings of very thin copper wire which is only shellacked to insulate it. Over time the windings coating will break down and the windings will 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, also sending the appropriate error code blinks.

The flyback is generally near the rear of the unit and is cylindrical with a large rubber wire, or wires, if a projection set, coming out of it and going to a rubber cup on the CRT or CRTs if projection. Near the flyback will be a large heat sink with a large transistor mounted to it. With the set unplugged check the large transistor or 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. If it is good it will have infinite resistance one way and 400 to 700 ohms with the leads reversed between either the base/emitter or the base/collector. In circuit tests between the collector and emitter will show a short because you are reading through the flyback transformer winding. You would have to take the HOT out of the circuit to test this double junction but if the other two junctions test as I have listed them, odds are the transistor is good. If all junctions test shorted the HOT is bad and needs replaced.

You should be able to obtain both parts, if you need both, at http://www.encompass.com or http://www.shopjimmy.com . Unsolder both parts and remove them from the board. This will require a large soldering iron, solder wick and a solder ******. Be careful not to damage the board. When installing the new HOT be sure to clean off the heat sink and apply new heat sink compound, if the old HOT was mounted with heat sink compound (not all transistors are), 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. Clip one end of the wire to the ground strap around the CRT and the other to the screwdriver. Slide the tip of the screwdriver carefully under the boot on the CRT where the 2nd anode is attached. 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. Generally even if you have bad vision you can focus the set by making the image pixels stand out. If you tune through the range of focus you will see what I mean. 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 will 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 except there are three contols for focus and three for screen drive (red,green,blue). 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 and for the great rating.

hardrocko

on May 23, 2010 | Televison & Video

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

Phillips 60pp9202 high voltage transformer


You can get the HV Transformer at the following link for 132.00 which includes free shipping and free step by step instructions by online instant messaging so you can easily replace the part yourself. Very easy repair. The HV generator is listed under the flyback section yours is Phillips 32942 Flyback ( HV Transformer)
Heres the link.
http://servicemanuals.vstore.ca/

Aug 01, 2008 | Philips 60PP9202 60" Rear Projection...

2 Answers

I bought a new flyback transformer for a RCA D52W19 TV, but it came with no HV wire. How do you connect to it? Or maybe I was had?


This transformer does not come with the HV lead, you will need to use the one that is there on the old FBT. Unplug the TV for about 30 minutes to allow it to drain any voltage that might still be in the capacitors.
Remember SAFETY comes first.
Good Luck.

Jul 24, 2008 | Televison & Video

1 Answer

Panasonic PT-53WXD63G Flyback, H.O.T., and Triper


The small wires are disconnected at the focus and screen control block, and the large HV cable is disconnected from the HV splitter.you may have to reuse the large red wire if the new flyback doesnt have the HV lead attached. The Hot is the horizontal output transistor its mounted to a aluminum heat sink near the flyback.

Jul 24, 2008 | Panasonic PT-53WX54 53" Rear Projection...

1 Answer

Horizontal/Vertical Postion of Image on LCD Monitor


the controls for focus adjustment are on the flyback transformer, (that big black thing on the left hand side (usually) of the monitor with the thick red wire that goes to the CRT.) the flyback may have 1,2,3 or even 4 knobs on it. 3 of these would be labled SCREEN (bottom knob of flyback. handles brightness)
FOCUS 1 + FOCUS 2 (focus adjustments. these are what you need to play with) and the 4th knob (some old mitsubishi workstation monitors had these) i do not know, it wasnt labled and HV adjustment was on the deflection board

Apr 25, 2008 | Gateway FPD2275W LCD Monitor

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

1 Answer

RCA D52W19 Flyback Transformer


This transformer does not come with the hv lead,if the arch is coming from the side of the transformer,cut the side of the plug were it goes into the transformer and the lead will come out,there is no voltage stored on the hv lead after the set is unpluged for a few min.,the transformer you can get at any rca repair center.

Mar 21, 2008 | RCA D52W19 52" Rear Projection Television

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