Hello everyone I could use some help. To start with my LCD tv was working fine but over the past few months it would turn off on its own. The remote would not tun it back on. I would have to turn it off and back on at the tv and it would come back on. The other day it did it again but would not come back on. I took it apart and seen 1 capacitor swollen and the 6.3 amp AC fuse blown. I replaced four capacitors and the fuse. As soon as I plugged the tv in to the outlet the fuse blew. Where should I go from here its all new to me. I have an automotive electrical background not this type but enjoy learning. Any help greatly appreciated.
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Re: Magnavox 47MF437B blowing fuse
Can you take some pictures of your board and post them? Up to 2000x2000 pixels size - closer the better. Use macro mode and a sunny day for best results.
The main causes of the fuses blowing are:
- Bridge rectifier shorted
- Power MOSFET shorted
Usually when the second happens, a few other components are damaged (on PSU), but it is still repairable.
Magnavox/Philips TVs have crap capacitors (saving pennies at the customer's expense) so the caps failing are probably unrelated. What replacement capacitors did you use - where did you get them, what manufacturer/series, capacitance, voltage?
Do you have a multimeter - I assume if you work with automotive electronics you do?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: Magnavox 47MF437B blowing fuse
One of these service manuals may match your chassis:
http://elektrotanya.com/?q=showresul...oria=&kat2=allLast edited by budm; 05-03-2012, 03:18 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Magnavox 47MF437B blowing fuse
OK, thanks for the quick responses. I'm going to try and post pic's. As far as the caps I replaced I do not know what brand they are. I went to our local tv repair shop with my old ones and asked if he had any replacements. He then provided me with replacements tellingme they were exactly what I needed.
Having trouble uplocading my pic's the system keeps informing me the upload failed. Im going to have to review the pic upload process.
Also I do have a multimeer, I have a Fluke 88Comment
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Re: Magnavox 47MF437B blowing fuse
See if the PDF I provided match your power supply module, that will make it easier to troubleshoot the problem.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Good day folks......wow this new layout is weird. It's like I woke up one day and I'm no longer on Planet Earth or something
Anyway....got this here power brick from a USB to SATA adapter which keeps blowing the fuse after I almost repaired it. The reason I even bother to fix a power brick (wall wart, whatever) in the first place is because this thing was really convenient to use: I'd just plug it and that's it. It's a dual output supply, for both 12v and 5v, which although I COULD easily obtain with a DC-DC converter from a standard 12v adapter, I thought I should crack open the... -
Looking for some assistance please.
Trying to repair a PD27AOQ samsung power board.
Initially had the typical problem of cm806 capacitor blown, additionally thermistor NT801s blown.
Replaced the ceramic capacitor, str60252s, bridge rectifier, thermistor and fuse.
Testing it the fuse blows immediately power is turned on.
diodes dm852 and dm853 test as shorted when in the board but fine when removed.
any assistance, guidance would be appreciated. -
Hi all,
I am a newbie and not very experienced so bear with me if i struggle sometimes with technical language - but I'll do my best. I searched "Samsung" and the model number on the forum but didn't find anything I could understand!
I'm not an electronics guy - just picked up stuff over the years through my flight-simming hobby.
I have the above mentioned 46" tv as the monitor for my flight-sim setup. Recently it went "crack" and stopped working. No standdby light and no response. I assumed a fuse had blown and after investigation... -
Hello, I disassembled this dead camera, and found this WTF… Two fuses soldered one above the other !
I was pretty sure nobody touched it before, but that can't be from factory. There is flux, and capacitor is probably missing.
The other weird thing : the fuses are « G » fuse : (0.75A – 8V), seems very low. The original fuse should be « O » : (32V 2,5A).
There is « O » mark beside. All fuses have the same mark letter on main board. So, I can deduce it's a « O » fuse.
And this correspond to the issus I saw : when I plug the battery, I measure the voltage dropping... -
Hi all, so i was watching tv acreen went black and no sound. Traced problem to blown tcon fuse. Replaced and it blows replaced again samething. So my tcon fuse keeps blowing. I bought a new board havent installed yet infear its just going to keep blowing the fuse. If i only connect the right side ribbon cable the fuse doesnt blow but as soon as i connect the left cable my tcon fuse instantly blows and no picture. The right side picture works clear as day and left side picture is grey (picture attatched) im hoping its a bad tcon board itself or a cable or anything and not the panel. Thank you for...
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