LCD TV's 2/3-rd of screen VIBRATES strangely !!! - AVS Forum
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post #1 of 6 Old 09-14-2013, 04:50 PM - Thread Starter
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Hi.
My LCD TV's 2/3 of screen vibrates strangely. Still has sound and all functions.
Do you think Screen is gone?
Or some part is damaged and it's fixable?
Thanks.
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post #2 of 6 Old 09-15-2013, 12:47 AM
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Sounds like an LCD Backlight inverter board transformer or it could be simply loose
screws where the backlight inverter board attaches .
Some times the backlight inverter boards attach to the rear of the panel .
The LCD panel itself specifically can not vibrate but an attached board can .

Take the back off try tightening the screws inside that mount ALL the boards and the rear panel cover . You will likely find the offending part behind the area that you feel the vibration
at the worst you may need a new backlight inverter board simple repair. Rr it might just be loose screws
could also be power supply that is where the mains cord attaches .

Caution LCD sets specifically the CCFL backlight can have 700 + AC volts inside when on( that is what the backlight inverter board feeds the CCFL back lights ) so take adequate precautions .
LED backlight only sets do not have those high AC volts .
Plasmas also have high voltage circuits .

This is a picture of a typical CCFL backlight inverter board
the electrical coils (transformers ) can some times vibrate
or again it just may be loose screws that hold the board in

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post #3 of 6 Old 09-16-2013, 09:44 PM - Thread Starter
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Recently i got similar TV with broken screen, so i replaced starting Inverter board, Power board, Main board(HDMI) and even Tcon board with all same results: vibrating screen.
So what's left? Screen itself i guess... Did i miss something?
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post #4 of 6 Old 09-17-2013, 12:12 AM
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Quote:
Originally Posted by GEOgamer View Post

Recently i got similar TV with broken screen, so i replaced starting Inverter board, Power board, Main board(HDMI) and even Tcon board with all same results: vibrating screen.
So what's left? Screen itself i guess... Did i miss something?

I thought you said the screen was broken how could it work with a broken panel?

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post #5 of 6 Old 09-17-2013, 05:14 PM - Thread Starter
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Broken one is another, similar so i used parts from it.
So what's your guess?
Could be screen backlight lamp itself? I can reuse old one if it worth.
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post #6 of 6 Old 09-18-2013, 03:32 PM
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Quote:
Originally Posted by GEOgamer View Post

Broken one is another, similar so i used parts from it.
So what's your guess?
Could be screen backlight lamp itself? I can reuse old one if it worth.

thats strange symptom if is not a board (they usually buzz. audibly) OTOH LCD does uses maybe 35KHz AC signal to run CCFL backlight so a low frequency vibration maybe is to me unusual maybe you can run the set with backlight unplugged LCD should still be on you can check with a flashlight and look for image and then maybe eliminate back light as cause or not. I can not imagine the LCD itself can vibrate . does your spare back light work? might be worth a shot. if you can narrow it down.
let us know what you find? unless it is your main board or power supply transformers OTOH I believe you mentioned replacing some boards already?
maybe run the set with the back off take a pencil or something like that (non conductive) and touch different areas and try to isolate vibration in that way .






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