20 Most Recent Memorex MLT3221 32 in. LCD TV - Page 4 Questions & Answers

If the screen has gone off but the sound still works then its most likely the inverter has gone bad. Check for open fuses or leaking and expanded capacitors.

Since you do have briefly, this indicates that the more complex section of your set is working.

The assembly that can cause this is the power supply and this is a common failure in all too many of more recently built TVs.

The supply is normally built on a separate board since these are often out-sourced by set manufacturers.

Unplug your set overnight to allow potentially hazardous voltages to discharge, remove the back panel of the set so you can see the guts.

Look for a smaller board with larger parts on it; some cylindrical (capacitors), others block-like and relatively large (chokes and transformers).

You should also see a relationship between the board and the incoming AC.

It will likely be only plugged into various others with dissimilar plugs so it should be easy to remove and replace.

Check the board for a label or if not present, a stamped-on number.

Call the manufacturer's service center with your TV model number and the number found on that board and inquire about repair/replacement costs; if both are offered, they won't be that much different.

If you must buy a new board, don't dispose of the failed one as there are smaller companies that can repair it for less than the mfr. and then keep it as a spare as this problem will likely arise again.

Are you using HDMI? If you do, you will need to check the on screen HDMI sound setup to see if the TV HDMI is set to get the sound through the HDMI port or from analog RCA jacks (Red and White audio line in), same thing for the Blue ray player, need to find out if it is set to send the sound through HDMI or through the analog RCA audio line out.

Please leave rating if it helps.
Basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/ Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

It will need parts, please read below to narrow down the problem.
Parts and prices: http://www.shopjimmy.com/catalogsearch/result/?q=Memorex+MLT3221
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board. if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having. 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: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors: 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. Please post back what you find. Please leave rating if it helps.

That can be the 24vdc power supply (bad caps with domed tops) for the backlights inverter is bad or bad backlights inverter boards. Those are the two things you need to check first.
You should look to see if the screen is glowing in darkened room to verify if the backlights are on or not because if the T-CON board is nad, you will not see pictures either.

Parts:
http://www.shopjimmy.com/catalogsearch/result/?q=Memorex+MLT3221+


If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting http://www.fixya.com/support/r7406380-tv_training_manuals Failed TV and Monitors: 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, long life rating such as PANASONIC FM or FC series. Please leave rating if it helps.

Hi johnnie,
Welcome to FixYa.
My name is John. I will be assisting you with your issue.
You can get it here. www.TvRepairKits.com
Thanks for choosing FixYa........John

Black box means your Closed Caption is on Text, simply go to menu and turn off

Is it still under warranty? It can be the power supply problem, but do not open it until you find out if it is still under the warranty or not first.

Please see my basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting Failed TV and Monitors: 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 rating such as PANASONIC FM or FC series.

Please read some troubleshooting guide first before buying any parts.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board. if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having. If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Please see my basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps. Parts: www.shopjimmy.com

Please post back what you find.

This is typical with many sets when it goes old as there is a high possibility that the components over a period of heating and cooling , tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs.

Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points. Please find below two links for tips on poor start ups, as if the set is totally failed the SMPS might be faulty

You need to check the power supply first, please read my guide.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Please see my basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums 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. Please post back what you fin

The component in the power supply module may have blown up, you need to look inside and see if it has any blown parts, main AC fuse, caps, etc.

Basic LCD monitor and LCD TV troubleshooting guide:

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Failed TV, Monitors, Caps : http://s807.photobucket.com/home/budm/allalbums

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Capacitor kits: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you. Please post back what you find.

First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board. if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having. If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on: Please see my basic troubleshooting guide here: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums 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. Please post back what you find.

Seems like your inverters boards have gone up they will need replacing. You can find your inverters here: CLICK just type in your model#. To install the inverters requires opening the back cover really not that difficult. I can walk you through it at the link below if you like..... hope this helps....
http://tvtechwork.webs.com/

This might be you back light not fire-ing now this can be caused by 3 things

1. power supply
2. back light itself
3. back light inverters

I welcome you to get it checked out. Remember we aren ot there prsent so it would be hard to make a 100 percent dead on answer.

Please be considerate remember to leave a postive rating and or feedback, Thanks Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620

I ran across this prob several times on these tvs...the backlight power supply board probably has a defective cap(s) on it. mine had the whole top blown open..these caps are rated for 105 degrees C and are high temp/high frequency. I believe they were 1000uF/16V and are available most any electronics store.

LCD sets (other than those very new) use fluorescent back lighting to produce the picture. Those lights require high voltage to ionize them so the problem could be either the tubes themselves or the inverter that produces the high voltage is failing. Anyone with some degree of manual finesse and possessed of logic can cure this problem but it may be difficult to identify the failed part accurately meaning that if you 'shotgun' the problem, you would need to replace both the tube(s) and the inverter board. The latter is in most sets as a separate assembly which derives its operating voltage from the main power supply and will be obviously attached to the fluorescent tube(s).
The board will have to found from the manufacturer or a company that disassembles scrapped sets.
Check with the site below for availability:
Jimmy's Parts
Search on your set's model number and the term 'inverter.'
The tube(s) can be bought from several US suppliers.