Question about Flat Panel Televisions
I purchased a Magnavox 32" LCD TV about 7 months ago. The problem with it now seems to be power related. I don't believe a sustained any type of power surge, but I can't confirm that 100% The stand by light on the power button is on, but the unit will not turn on. I did get it to power on briefly for about 30 mins after it seemed it would not turn on again. I just left it unplugged for several hours, and then tried to power it back on and it did. During this last time I had it on, I checked the menu settings to see if there was anything I can do, such as resetting it. Since the last time it was on it will not power back on anymore. I have contacted Magnavox support and they tell me that they will cover parts warranty, but not for labor. I am very disappointed with them to say the least. I decided to remove the back cover and take a look at the main fuse. It seems ok when I checked it on the multimeter but could it still be faulty? On the main power board I could only find one fuse, maybe there is another one. Well it seems it is power related, but it might be a component level issue on the main power board, or even something else. Anything other suggestions would be welcomed.
Here is the model no. 32MF337B
While this isnt an exact fix at work, you will at least be able to view your tv. We have one at work that would do nothing when you hit the power on button, just the usual geen led flashing. We pulled the cover off and found the bulging caps, more than likely from brown outs. But we also found that none were holding a charge. So we held the power button on for at least five min, after the led would stay on for about 30 sec and then turn off. We kept hitting the power button and the screen would try to come on. It finally did. After it did come one we can power on and power off aslong as we dont turn it off for more than 10 min. After 10 min of it being off we have hold down power button again and start the whole process again. So the main problem i believe is the caps arent holding a charge, to be able to kick the high voltage circuit on. We did not replace any caps but if we do end up changing parts will post what was changed and cost. Hope this helps
Posted on Jan 08, 2009
You most definately have bad capacitors in the power supply. try and get it repaired as soon as possible, not an expensive repair that iv'e seen.
Posted on Feb 04, 2009
I am currently working on this model set and have discovered the same type of problems. Fix: 4 capacitors in the power supply section on the main board were defective (bulging out). Common problem with counterfeit parts that originate in China. See http://www.badcaps.net for details.
Posted on Jul 12, 2009
I'm not too familar with this model, but to give you some pointers, you will find when you have this problem the fuse will go straight away as there will be some of the semi-conductors short circuited. Check your bridge rectifier diodes & also the chopper transistor in the power supply. As a general check, test most of the diodes & power transistors & replace any that read short circuit on your meter. Hope this may help you as a guide line.
Posted on Aug 01, 2009
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