Toymax Televison & Video - Page 8 - Recent Questions, Troubleshooting & Support
Magnavox 47MF437B/37 works fine until
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
Picture on 42" visio went
there is a part that controls brightnes n contrast on tvs, thats the one that has to be replaced by an expert. When done make sure u use standard surge guards to avoid such damage. Its a simple job.
Picture has become too big for screen
Used ur tv original remote,look for a button like View Mode,Picture Size,Aspect Ratio,Zoom.Pushes one of these buttons to changes the picture sizes to fit ur tv screen.
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.
VIORE 42 INCH HDTV HAS
When Plasma TVs have sound but no picture, it's usually the Y Buffers or the Y Main board. If it's under warranty, take it in for repair. If it's not, you'll need to decide if you want to work on it yourself or take it to someone who will repair it. Good luck!
Tv turns black after about
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.
How to take out 2
Get a soldering iron, some solder and solder wick. Use the wick and the iron to remove the solder off of the legs of the cap. Remove the cap. Install the new cap exactly the same direction the old one was in. With solder and iron, solder the legs on to the board. Cut off the extra length of the legs and you are done.
Y Buffers or the Y
WE all hear that POP sound from time to time. I assume we are talking about a CRT, TV. That pop sound is most likely the OPT blowing.
Output Transistor, for the LOPT. Line out[put Transformer.
One of the two need replacing.
hope this helps.
I have had my tv
Your tv has " capacitor flu".
Apparently, the companies in China, Taiwan, Indonesia, Bali, and a few others, made a whole bunch of capacitors that, knowing that they were junk, got put into tv's and monitors anyways.
The capacitors are supposed to have a life expectancy of around 25-30 years, but the junk ones are only lasting around 18 months or so.
It isn't anything that you did to the tv, it was doomed from the start.
About the only thing you can really do, is take it toa service point.
I suggest Fry's, or BestBuy, as they are the most trained for the repairs.
Before you get it fixed though, get an estimate of the repair costs.
I say this because the repairs may be as expensive as the cost of a new tv.
I hope this helps you out in understanding what happened, and good luck !
Hello to you too, have a quetion, ask it
Will not turn on
your problem is your power supply....you have to do is remove the cover find the power supply and remove it from the unit....you have a two options 1 is you buy 1 set of power supply and the other is repair that buy finding open resistor and shorted diode and transistor and also leak capacitor thank you
Tv wont turn on at
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.
I do not think it needs replacement, rather some defective capacitors are 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.
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.
Viore 42" plasma tv has
The tv was working fine until this morning, then the picture went out but the sound is still working.
TV is only 3 years old, no real electrical problems
Maganovox 37'' power button not lighting up anymore.
Set your volt meter to the diode check and measure across the white fuse [power off and unplugged],Shuld read zero. Then the fuse is good, an open fuse will have no reading. If you replaced the caps....be sure the voltage is the same or greater. The Mfs must be the same...and most importantly be sure they are 105dgrees. In some cases they could be 125 degrees. If you replaced them with 85 degrees you will definitly not get a good start up. And always be sure you check the polarity on the caps to the board. The board should show a plus or minus. The long leg on a new cap is always positive. Locations for the caps I believe are2074 which is 25volt 2200Mf and cap 2081 is 35volt 1200Mf and a third cap 2066 at 16volt 10Mf. Be very careful with cap 2066 as the trace on the board can be damaged when you unsolder this! Good Luck!
We have a power outage and tv will not turn come
check your power supply board, the problem can be:
- check the fuse
- check the capacitor if puffed you have to replace
- check the main mosfet chopper if shorted you need to replace it;
if you are not a trained technician and you don't have idea about electronic you have to call for service.
Philips Magnavox 37" LCD Flat Screen 37MF331D \37
There are two capacitors in the internal power supply regulator board that have been the main culprit of this particular issue. You can identify the bads ones by the slight buldge at the top of the capacitors.
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