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How to adjust the horizontal of LG 29FS7RLX CRT TV 29 inch

The flyback transformer started arching and it was replaced. The replacement resulted in the pictures over flowing the screen. How can someone adjust internally owing to the fact that the a similar transformer may not be found?

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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silly girl
  • 513 Answers

SOURCE: TV focusing problem

It's good that you know how TV's can bite, I'll still have to post this in case someone having your problem and reading isn't aware of this and feels lucky- If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages. could be a problem with the screen potentiometers block. should be located on the chassis close to where the HT lead passes on its way to the picture tube. Good luck

Posted on Mar 16, 2006

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techman
  • 3130 Answers

SOURCE: No power

The D1541 is a horizontal output transistor, not an IC. Your problem is definatly a bad flyback transformer.

Posted on Sep 18, 2006

tvtek
  • 1284 Answers

SOURCE: RCA D32F750T TV

Did you adjust the two controls on the new flyback? The top one is almost always the focus control and the bottom is the G2/screen control (brightness) If you adjust the G2 do it until the picture looks normal, too high and you will get retrace lines through the picture.

Posted on Jan 26, 2007

jerryg50
  • 1689 Answers

SOURCE: RCA pix tearing horizontal lines

Get an ESR meter and check all the electrolytic capacitors in the set! I am sure you will find many decoupler and coupling capacitors that are on the edge or too high in ESR.

Jerry G.

Posted on May 25, 2008

jo_chinmay
  • 143 Answers

SOURCE: Connecting Dell Precision Laptop to Samsung 29 inch Easy View (CRT) T.V

dear sir.

here u have to chek cable yr laptop is not support with a same s-cable u need to connecter for s-vadio to audio vedio connector and it's convort yr s-cable to comosite cable afer that it's automaticly dosply thru composet.... yeah one thing have to chek with different cable then selacet display propatise to set output setting is set in to s-video.. it's help u...:)


Thanks
please vote
jo_chinmay

Posted on Jan 02, 2009

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1 Answer

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

Lg crt 29 inch tv wont start


The frame amplifier, like the line amplifier, will not work if there is no output from the oscillators for them to amplify.

Early 405 line sets didn't have a frame oscillator as they used the sine wave from the AC mains but I believe the later sets needed a frame oscillator and a sync signal from the rf demodulator to prevent instability.

Transistors rarely fail by themselves and it is often external factors that cause them to overheat and fail and an essential part of the repair process is discovering what factors caused the initial problem. Modern circuits use a lot of multi-transistor dc coupled stages and it is often the bias of an earlier stage that is the culprit.

The frame output transformer is usually very robust and much less likely to fail than a line output transformer. I suggest you ensure the correct operation of the oscillators before going any further.

Aug 30, 2016 | LG Televison & Video

1 Answer

29 inch crtv flyback transformer was making a hish bad noise till it went off dead the tv with burnt fuse what could be the main thing to first look at guys?


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

Feb 27, 2016 | Televison & Video

2 Answers

I HAVE SHARP COMPANY 21 INCHES CRT MY FRIEND TV SET PROBLEM IS SET DEAD IN POWER SUPPLAY TRANSISTER 1886 REPLACED AFTER POWER SUPPLAY IS OK FBT ARCKING THEN IMMEDIATLY SET SWITCH OFF SET IN CIRCUIT R6


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Nov 21, 2014 | Sharp Televison & Video

1 Answer

Picture on Samsung TXL2791F gets smaller after a few minuets


The horizontal output transistor that drives the flyback transformer overheats now. There might be other reasons too for this fault. If the flyback transformer has any internal winding short, this transistor will overheat.
Just replace the horizontal output transistor. Check its heat. If the newly replaced transistor too overheats, replace the flyback transformer.

May 24, 2012 | Samsung TXL2791F 27" TV

1 Answer

I have LG CRT monitor 17 inch .when i switch on my crt it start sparking sound but not actual spark . the sound was so iritating & sparking shows on screen but not inside the monitor. So what was the...


hi,
You have to replace the flyback transformer of your monitor. Its a high voltage stepup tansformer which provides necessory volteges for the picture tube like Anode voltage, screen voltage and focus voltage. After some years of use the insulation stength of the flyback transformer will become bad and the high voltage will try to discharge trough the nearest ground poit. At that time you will hear the sprking sound. Its because of the high voltage Anode volt is discharing to the ground it will reflect on the screen. Using the monitor in this condition will result in the failure of horizontal driver transistor and even the power supply. Replacing the flybalck will solve your problem.
ok

Aug 02, 2011 | LG Studioworks E700S 17" CRT Monitor

2 Answers

Sharp tv primo 21`inch turn on red light only


check your horizontal transistor maybe it's shorted replace horizontal transistor or maybe the fusible fuses are open check for open resistors at the horizontal section of the circuit.

Dec 22, 2010 | Sharp Televison & Video

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

No power.


Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.

Aug 23, 2007 | Sony KV-32V35 TV

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