Re: Emerson LC401EM2F
Same TV, same dead diode. Ordered the part today from mouser, will let you all know how it turns out.
Same TV, same dead diode. Ordered the part today from mouser, will let you all know how it turns out.
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Re: Emerson LC401EM2F
Replaced the diode in question, now instead of the light bulb staying on constantly, it rapidly blinks for about 5 seconds and then dims for about 2 seconds. The front panel LED blinks red 15 times.
I was told this set broke after a lightning storm. I found a burnt trace on the board and attemped to repair it. Can anyone check my work?Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Emerson LC401EM2F
Here's a pic from the service manual if it helps.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Emerson LC401EM2F
Hi guys,thanks for the good info in this forum.
I need some help with this same board,it was blowing the fuse and i went checking everything explained here.
this is the list of parts changed:
Rectifier diodes 3 were short,replaced all 4.
D1208 Short,replaced.
As the manual i have the 4.3v all good buy i got nothing after q1201 and q1202 going to the relay.
My question is:
Are those transistor in charge of the power on cycle,or is any other part could be bad?
The fuse do not blown any more,i have power before relay but after relay nothing.
Guys thanks in advance.
Chris MComment
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Re: Emerson LC401EM2F
Ok, problem solved.
After a few days troubleshooting i found that the problem was a broken ribbon flex cable,the connecting the power supply board with the main CBA AV Board.
Was not visible damage,was broken internally, however testing continuity,wasn't any signal,so carefully i inspect it,found the problem and repair it.
I put everything back together and bingo,works like new.
Thanks guysComment
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Re: Emerson LC401EM2F
I was looking over this thread since I'm working on this exact problem. Here's what I found when I first looked over the PS board.. On D1208 as mentioned in this thread, there were heat signs on the top side of the board. On the bottom side, you can see the solder is missing on one leg of the diode.
So my question is, do you think part of this problem is caused by cold solder joints on the diode D1208? I intend on replacing the diode, I'm just curios if anyone else has found something like this?Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Emerson LC401EM2F
That is the snubber diode for that STBY SMPS IC, it looks to like there was cold solder joint so it heats up due to contact resistance. I would replace it.
Are you getting the STBY Voltage?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: Emerson LC401EM2F
LOL@ 2000W fuse...
Even if it was a CRT, that's likely more current than needed for the fuse.
Yes, CRTs OTOH have an inrush current, but that's probably more to do with the primary caps. But 8A???ASRock B550 PG Velocita
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Western Digital Black SN850 1TB NVMe SSD
Alienware AW3423DWF OLED
"¡Me encanta "Me Encanta o Enlistarlo con Hilary Farr!" -Mí mismo
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Re: Emerson LC401EM2F
Hi Bud, I'm not getting anything at the moment. I've got a diode ordered and waiting for it to arrive (should be here by Tuesday). I thought I'd replace it and then see what I have. Once I get a new one I'll post any new findings either way. It also has a brown heat mark around resistors R607-608-610-613. Would this be from the diode, possibly indirectly?Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Emerson LC401EM2F
I cannot tell from the pictures as to what those resistors are used for.
BTW, I hope the SMPS IC is not damage when that snubber diode was not connected.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: Emerson LC401EM2F
The fusible resistor R1201 which you should check to see if it is OK, it is 1 Ohm resistor.
BTW, the connection of the Zener Diode D1208 does not match the diagram in post 1, it is not snubber diode, the snubber diode per board layout is D1205 along with the the C1202, R1202, R1203 which form RCD snubber network.
The circuit should work without Zener D1208 in place.Last edited by budm; 07-23-2016, 12:36 AM.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: Emerson LC401EM2F
Bud, in the picture attached are the voltages I got this morning after removing D1208 from the board, and checking R1201 that checked out to be good. Diode 1208 on my board was definitely bad, it had a gaping crack all the way down the side of the diode.
Are those voltages within range?
I did turn on the TV and the screen lights up and everything seems to work normally, however, I didn't leave it on long for fear it might do some damage with the missing diode. I was curious to see if it would come on or blow the fuse. Which as you probably guessed is why I didn't have anything at the moment from earlier. I had to round up a good fuse since the one in it was blown.Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Emerson LC401EM2F
I too replaced D1208 and have a working TV again. Had it on all last evening and works like a charm! Thanks Mark369, and budm for your work and dedication on resolving this issue.Comment
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Re: Emerson LC401EM2F
Hi all, my philips was also blown by the surge. I ordered a kit from shopjimmy to replace as per their recommendations for blown fuse. Found some rectifiers dead and replaced them all, aslo D1208 and IC1201. i used the BUDM's light bulb test. Looks like the parts from the kit were not same nominals. I crosreferrenced them on Mouser.com. Ordered the right Zener Diode D1208 and rectifiers. Now all in the light is on all the time and IC1201 is getting very hot. What else can i test? any ideas?Comment
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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 I wonder if anyone might be able to steer me in the right direction. I have this Samsung UE46ES8000 TV and it went bang during use. The main fuse on the PSU board is open. I've checked every diode/mosfet/transistor I can see and nothing appears to be short to cause the fuse to go. The DC output of the bridge rectifier is not short either. I've seen online that some of these models are known for having their PFC mosfet or other mosfets shorting and blowing the fuse but i'm not seeing that here. If anyone aware of these models having any issues to cause this? I'm reluctant to just replace the... -
Hi guys,
I'm inexperienced with electronics repairs, I've done a little bit of soldering caps and whatnot, but i have a blown fuse on this mimaki printer I got which I have bought a replacement for.
How do I remove this type of fuse (see picture)...it kinda looks like it would pull out of that bracket but it didn't come at first pull and I didn't want to brute force it incase it's soldered on there like most of the rest of the components.
Anybody know how to remove this type of fuse?
(The fuse is toward the bottom of the image labeled F2)... -
I found a project in the electronics trash yesterday. A nice Argon SA1 audio amp with some electrical issue. Took it apart and saw that the 4A250V fuse was blown so started lifting components to find the short. Eventually got to two MOSFETs (model FTA14N50C) that are shorted and when i took them out the short was gone.
Now i didn't have any replacements of the same model of course but i found a couple with pretty similar spec i thought (K10A60D & K12A50D) and put them in. Also replaced the blown fuse with a 3.5A250V one. Checked another time for short circuit and plugged it in.... -
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