20 Most Recent LG 47LG50 47 in. LCD HDTV - Page 5 Questions & Answers

A test you can make is remove most of the gear that is connected and start with just the cable and no box connected--run to see if issue happens-Add more equipment until issue appears again--try this way to see what unit is causing this---if nothing but a DVD connected and it does it--its in the set--if not a time consuming thing but only way to see which piece of the equipment involved is the problem.

may be power supply need more information

Have you tried to adjust the controls in the main menu or not?

Only way to know is replace all possible boards one at a time---900 is a bit low for a display panel which can cause lines as the worst case situation---

Your panel is bad. Not worth repairing.

You haven't given the exact model number to your Vizio TV here. There are so many types of T con baords. images of two of them are attached. Contact the nearest authorised service center for Vizio to get an orginal replacement board.

A white screen with nothing else leads me to believe you have a problem with a t-con board or a signal board on that TV.you can get parts for this tv at www.interliquidparts.com

I am currently experiencing this exact same problem with my 47LG50. Since the original thread was posted more than three months ago, I imagine the original poster has had his/her issue resolved, but I can still relay what LG told me to try when I called them. Did it work for me? No. I have to call The Geek Squad with Best Buy (as the TV is no longer under manufacturer's warranty, but thankfully, we bought the extended warranty with BB), but it could work for some, according to the representative I spoke with.

Try taking the batteries out of the remote, and see if this resolves the issue alone. If not, try unplugging the TV entirely and holding the power button down (it's just under the power light, carefully hidden, and shaped like a smile) for at least 40 seconds. After that, plug the TV back in and power it up to see if it has resolved the issue with the flashing menus. Even if it seems to have done, you might want to leave it on and keep an eye on the screen for a while. I had mine abate for a little bit, but then it went right back to flashing menus. The issue of it powering on by itself will be pretty easy to notice if it is still doing it.

I hope this helps someone, although it didn't work for me. =)

Hello,The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.All these can be checked on the power supply board.But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.I hope this helps.Good luck......

Bad Caps In the power Supply,Look for Bulged Caps,Only Change Them If your a Technician

The solution for the problem is to replace the control PCB. The PCB is the printed circuit board that controls the volume, channel and menu buttons.

These parts can be found and bought from Sears parts direct.

A break down of the cabinet parts can be found here.

Hi Jack, have you found a solution for the TV problem? I have the same TV with the same problem. Let me know.

This is a fault solution which can be checked and corrected by you assuming that there is no component failure. 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 or poor performance.

The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.

Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.

Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.

Check for tips to look into the SMPS unit with some of my tips:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

Thank you for using Fixya.

The tv power supply board it is the causes and the problems.That the board where the tv power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish tv power supply board for the replacement.