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Questions & Answers
The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name"
to your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage
" to get gathered related posts.
on Dec 06, 2017
I had a similar problem with my Phillips 42 in. LCD HD TV.
Here's the problem. The Power Supply Board. I opened my TV
up(warranty was up of course) and found several bad capacitors.
Phillips and several other companies were sold capacitors that although
were highly rated failed within 5 years because of a lack of
preservatives. All sorts of electronic equipment is now being effected
due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.
Hope this helps
on Sep 05, 2014
Displays white screen, means, the absense of video signal. The T'Con board should he checked. If you wish to get more details, check this site linked. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the
brand name and model number to of your set
, to its search box, and
or view it in Mosaic / Timeslide
on Sep 19, 2013
You can upgrade the software, if the software running at your TV is earlier version, than the software you are going to upgrade. For more details, check this link.http://electronicshelponline.blogspot.com/
It will be very helpful to you, as it has illustrations and screen shots of software upgrade. I've came across it recently. Here is its link.
on May 13, 2013
Could be main AV board not receiving the proper voltage due to a failing capacitor or power transistor. So I suspect a PSU failure.
on Jan 16, 2013
this is a easy fix. some small pieces of lead into the front of the screen will take care of the problem . in other words go in the closet and get the darn shootgun and blow the hell out of it!!!!!!!!!!!
on Dec 19, 2012
I see so many here with no sound/nopicture issues:ISSUES: 1. IF sound main fuse/s are good.2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.3. almost all these sets the troubleshooting involves checking
voltages on the main power board to narrow down theproblem.4. Be safe and if you do not know what you are doing don't open the set.Answers to issues:1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.3. Trouble shooting consists of the above and then at some point you have to buyand try a board to see if it fixes it or not.4. Safety first--no TV set is worth getting injured or even killed over.If set is opened at least look for puffed up and bad caps like in thisphoto.
on May 27, 2012
Power supply board is most likely issue here.
on May 25, 2012
did u fix ur problem i broke my screen and im triing to buy a screen off a used one if ur interested in selling me urs let me know
47inch magnavox (47mf437b/37)
on Dec 30, 2011
power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Hope it work with the solution
on Jun 12, 2011
The most likely failure is the main power supply. You may be able to identify it with the following instructions:
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.
Check the board for a label or if not present, a
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
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.
Unfortunately, the Magnavox name is owned by the Japanese Funai company which is known for poorly designed and not very reliable products.
on May 13, 2011
You may have power supply problem due to bad component or bad solder joints that expanded when warm up, or problem in the backlights inverter circuits, or bad T-CON board.
Try this when the screen black out.
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:
Failed TV and Monitors pictures: 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.
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.
on May 01, 2011
replace the main power board, would be the best way
on Dec 06, 2010
Please go here to calibrate.
on Jun 12, 2010
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