Re: Emerson LC401EM2F
I removed sa1601 and it looks like it's open no readings on diode setting or on any other setting
I removed d1201 to d1204 all ok.
I still think there is a short on 5v rail to ground but would like some help finding it
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Re: Emerson LC401EM2F
I think that it has a shot on 5.0v rail to ground but not sure how to find it yet.
I have a muilt-meter and a blue esr meter i have a 15Mhz scope but i don't know very much about the scope on how to use. don't think i could use it if there is no power on the board anyways.
could some one give me a hand to find short.
thanks and mary christmas to allLeave a comment:
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Re: Emerson LC401EM2F
https://www.badcaps.net/forum/showth...rson+lc401em2fI read this post before I started this one.
It's the same board same every thing. this tv is only 12 months old.
so you could use his pics same board no damage can be seen not even heat spots.Leave a comment:
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Re: Emerson LC401EM2F
oh yea and i tested on cold side ground to jumper wire J1114 labled RL + 5.0V and there is 47.2 ohm to ground if that means any thing. J1114 is connected to R1214 and D1215.
i know D1215 is with the relay RL1201 would that make it look shoted.
Thank you for your time. will post back soon.Leave a comment:
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Re: Emerson LC401EM2F
no have to get some stuff to set it up.
I had one fuse laying around and just tryed it and opened as soon as i pluged it in.
fuses 3.00 a pop.Leave a comment:
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Re: Emerson LC401EM2F
Both sides since you may also have bad rectifiers, MOSFET, etc. Did you try using lamp yet?Leave a comment:
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Re: Emerson LC401EM2F
so would i be looking for a short on the hot side only or anyware on the boardLeave a comment:
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Re: Emerson LC401EM2F
I would use a 100W lamp place in place of the fuse to see if it glows brightly (no need to turn the power switch on).
Or make one like this:
http://s807.photobucket.com/albums/y...t=DSC01681.jpg
http://s807.photobucket.com/albums/y...t=DSC01682.jpg
http://s807.photobucket.com/albums/y...t=DSC01679.jpgLast edited by budm; 11-30-2012, 02:52 PM.Leave a comment:
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Re: Emerson LC401EM2F
Shorts between rails would also blow the fuse, but they are rarer.
Shorted diodes could do it sometimes.Leave a comment:
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Re: Emerson LC401EM2F
would it only be a short to ground that would make the main fues blow?Leave a comment:
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Re: Emerson LC401EM2F
SA1601 is OK so the fuse is not seeing a dead shorts. How are the the Diode second set of the rectifier (D1607~1609)?
"c1612 on my blue esr meter it shows .33 in the board and on my dmm on the 20M setting it starts at 2.2 and then goes down" how far down does it go down to?Last edited by budm; 11-30-2012, 10:03 AM.Leave a comment:
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Re: Emerson LC401EM2F
so from my readings do we know if c1612 is good or do i have to lift a legLeave a comment:
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Re: Emerson LC401EM2F
Note with these self-oscillating supplies, ANY short on the output (secondary) will blow the primary fuse. There is very limited short circuit protection.Leave a comment:
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Re: Emerson LC401EM2F
c1612 on my blue esr meter it shows .33 in the board and on my dmm on the 20M setting it starts at 2.2 and then goes down. sa1601 reads 2.62 on 20M setting and it looks like a blue ballast capacitor i see in lcd smpsLeave a comment:
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Re: Emerson LC401EM2F
OK, discharge c1612 (150uf 450v) first, then take the resistance reading across that cap to see if it shows anything less than 100 Ohms, we are looking to see if you have shorted load which will be in parallel with the cap.
You also have two set of the bridge circuits, the diode you removed earlier are for the standby power supply, second set of the rectifier (D1607~1609) is for the main power that feeds the PFC circuit.
You should also check surge protector SA1601 to see if it shows shorted.Last edited by budm; 11-29-2012, 10:50 PM.Leave a comment:
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Re: Emerson LC401EM2F
ok that would make sence. i guss i will remove D1201, 1202, 1203 and 2104 and test.
they all show open but it is the bridge from what i can tell maybe one or more are part open and shorting and blowing fuse.Leave a comment:
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And this correspond to the issus I saw : when I plug the battery, I measure the voltage dropping... -
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