20 Most Recent Acer AT4220B 42 in. LCD TV Questions & Answers

no modern set has a vertical hold control, last ones were nearly 40 years ago. what is set doing or not doing?

Acer AT4220B 42... | Answered on Sep 08, 2015

Sounds like not only is your backlight going but you have a bad case of dead pixels. You can do 1 of 3 things...

Turn your unit in under warranty for repair

If your unit is no longer in warranty you can brave taking it apart and replacing the glass unit and back lights yourself... Find the make/model of the screen after removing the plastic casing and type it in on either of the bottom sites,


Or last option, sell it on ebay and lie lie lie about the quality of the unit and make sure that somewhere on the listing you put as is

Acer AT4220B 42... | Answered on Jul 29, 2012

You will need to do in-depth troubleshooting, it can be the power supply problem due to bad caps, or main board, or backlights inverter board.
Please read my guide to get basic understanding first.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Acer AT4220B 42... | Answered on May 01, 2011

While this site does ask for an email address and has an image security validation (you have to type the numbers shown) I believe you will get the manual in a pdf format.


Good luck

Acer AT4220B 42... | Answered on Dec 27, 2010

This tv have a 2 long boards call the LCD inverter boards.These 2 long LCD inverter boards are dead.These 2 long LCD inverter boards help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy a 2 refurbishes long LCD inverter boards for the replacement.

Acer AT4220B 42... | Answered on Dec 06, 2010


Thanks for using FixYa. From what you have described it seems that you might have a backlight issue with this TV set. It could also be due to the inverter circuits for the backlights. The inverter is the power supply source for the backlights. There could also be a screen driver problem; if it is then you have to change the entire board. All this is only recommended if you have some kind of expertise for checking the internal circuitry of the TV as these units have high voltages running even when the set is switched off.

Please do accept the solution if the issue is resolved or else revert for further assistance.


Acer AT4220B 42... | Answered on Jan 27, 2010

you should get in contact with customer support for a possible replacement , try this link,
click here:

Acer AT4220B 42... | Answered on Jul 09, 2009

You can use the "RGB" input in the video input menu of the TV. If you don't have that then you can't hook the PC to this TV.

Acer Televison &... | Answered on Dec 16, 2017

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