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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LG 21inch CRT TV. When it plug to AC some noise come form the SMPS transformer chopper did not TV work. Please can you guess the problem.


The most logical place to start in any TV which does not turn on, is the power supply circuit - and progress from there.
Unplug the set from the wall, and open it up for inspection.

If checks in the PSU turn up nothing obvious (i.e. no burned or damaged parts) and all the electrolytic capacitors in it appear OK (none are ruptured, blown, short-circuit or leaking), the next task would be to check the horizontal/HV section; the flyback transformer might have failed and/or horizontal output transistor may be shorted. If so, replace both parts with equivalent types (if available).

Also, look over the entire chassis to make sure there are no suspect, cracked, dry or bad solder joints anywhere. If there are some dodgy joints, re-flow them. To test the repair so far, plug the set back in to the wall and switch on.
~
Note: a new flyback transformer, once fitted, requires a small adjustment of the screen and focus controls (usually located on the flyback itself) to obtain the best possible picture. There is a "cheat's" way to do this (without special equipment) and that is - by selecting a blank AV input on the TV, to set the "user-brightness" level all the way up, and slowly advance the flyback screen control until you begin to see a grey raster with white horizontal retrace lines, then back off the control a bit so the lines aren't visible on-screen - using any source (e.g. a test pattern or DVD) adjust focus for the clearest picture, then turn the user-brightness back down to a level you normally watch. When you are sure the job is complete and everything works, unplug the set and carefully re-fit the back cover. No further setup or adjustment should be required.

Dec 23, 2017 | LG Televison & Video

1 Answer

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

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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