Re: phillips lcd keeps blowing fuse
Yes... and by zero, I should say, anything less than about 100 is most likely shorted, but almost every diode I have had fail does so at dead zero (or a few millivolts) in both directions.
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Re: phillips lcd keeps blowing fuse
I noticed that >| thought i had it set wrong.. theres alot of diodes to test..wil do that after dinnner! when you say " reads zero in both directions " are you talking about taking a reading then switching probe ends around ie.+ - then -+...thanksLeave a comment:
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Re: phillips lcd keeps blowing fuse
Set the meter to the range which looks a bit like this ->|-
If that highlighted diode reads zero in both directions it could be the fault. On these power supplies (resonant self-oscillating, no intelligent control) a shorted output will blow the fuse.
This is a bridge rectifier, typical appearance on a power supply:
http://media2.rsdelivers.catalogueso...7005465-10.jpgLeave a comment:
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Re: phillips lcd keeps blowing fuse
about the only way i can get a reading is to set meter to 20m or 20k is that correct?.. here are some pictures of the power board im not 100% . sure what a bridge rectifier is but i think i have it circled alone with a diode and something else im not sure what its called . ..sorry im still learningAttached FilesLeave a comment:
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Re: phillips lcd keeps blowing fuse
put the multimeter in the "Ohm" section and measure the 4 diodes one by one, or if your psu has a big bridge rectifier measure the 4 pins, alternating the probes. if you get 0 Ohms that means a diode (or more) is shorted.Leave a comment:
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Re: phillips lcd keeps blowing fuse
is that something that can be done with a multimeter and no power to the board?Leave a comment:
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Re: phillips lcd keeps blowing fuse
I agree. There are usually just about four components that will cause this and one is a very common failure - the bridge rectifier. As Mr. Bill says too, the mosfets are another cause of this problem as well.
With the power disconnected, measure resistance from both fuse tabs to chassis ground.Leave a comment:
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Re: phillips lcd keeps blowing fuse
Have you checked any/all of the diodes on your power supply? Mosfets too.Leave a comment:
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phillips lcd keeps blowing fuse
phillips 40pfl3505d/f7 lcd keeps blowing fuse on power board right by ac input. any idea why?Attached Files -
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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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