Question about LG 30FZ1DC 30" TV

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Got picture but no display... LG's 29" TV firstly got no power, but after changed a new flyback transformer, the TV already turn on but facing a new problem. That was no display at all..the picture and sound was in a good condition. But if i turn the volume or channel button up and down, the TV function but no indicator(display) on screen...could you please help me? is that my system ic was in trouble? which component control the display for volume, channel, all function menu etc...?

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  • SOUDESH Apr 05, 2008

    i have a lg flatron model RT-FB55VE AND THE DISPLAY SHOW ONLY 3/4 OF THE SCREEN

  • willoy May 21, 2008

    my tv is lg 21inch flat screen,what happen is the picture comes in comes out in every few seconds, it stay good picture with sounds 1 minuite is the longest.what i did is i open the cover remove all the conection and return it back then turn it on but same thing.this time i got only blue screen with white horisontal interlase.please help me what to replace,i have knowlege in electronics but not in tv.



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Yes it could be the microprocessor IC or the display IC. Im not sure how the display system works as I do not have a schematic for the set. now what I have seen in the past, is that when the flyback blew out it sent a spike pulse way bigger then it should have been and blew out the display sync circuit, and that is built into the microprocessor. Also I have seen in the past, when a main componet such as a flyback transformer is replaced, there are small surface mounted componets near and around the flyback that gets unsoldered. These are ussually small surface mounted type resistors or capacitors that send a pulse to sync up the display output with the horizontal and vertical sweep, or the display would not know where to be and would run so fast along the screen that you would not see it. Check out the horizontal pulses to the micro, or like I said the micro is bad. Good Luck

Posted on Oct 09, 2006


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1 Answer

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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.

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Hope Ya Fix It.

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