Re: LG47LC7DF Fuse Blows
can you double check the numbers of that ic as no hits when looking on google for it
can you double check the numbers of that ic as no hits when looking on google for it
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Re: LG47LC7DF Fuse Blows
I need better straight shot pictures of the top and the bottom side of the board, right now I cannot really read the designators as printed on the board.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: LG47LC7DF Fuse Blows
I rechecked the numbers on the small chip. The first line reads 0001 the 1 is very faint but readable after cleaning the part, The second line does not have a small o like I thought that is the number one pin designator. The second line reads just H48. I can't find that number in google or on digikey.
I will get better pictures of both sides of the board.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."
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Re: LG47LC7DF Fuse Blows
Better pictures. Front and backAttached FilesHave you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
I believe you found it. Thanks for hunting it down. Of course I am not smart enough to be able to understand any of that. Looks like it might be 6-16 volts in and 15 volts out. That is all I can tell. Will need help in getting specs to order if it proves to be bad after testing.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
I have checked on Digikey and Mouser under that SFA0001 part number and neither one has that number. Will email digikey with that pdf file attached and see if they can find a comparable part. I'll wait until we verify that I need it.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
Q103 is not the PFC IC, that is the MOSFET for driving the power transformer for 12v and 24V? (I cannot read the connector Voltage labels).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: LG47LC7DF Fuse Blows
The picture of the back of the board shows a small IC labeled U301. That is the one that I think is the PFC IC.
Also picture of the cable voltages on the front of the board. Two pictures to make sure I got all three connectors where you could read them.Attached FilesHave you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
Circuit function blocks.
Pictures provided by shopjimmy.
LG EAY36781302 Power Supply / Backlight Inverter
http://www.shopjimmy.com/lg-eay36781...pply-unit.htm#
The SMPS IC that drives the shorted out MOSFET needs to be replaced.
You also need to to test ALL the component that are connected between the GATE of the MOSFET and the output drive pin of the SMPS IC.
The very low (<1 Ohm) OHMs resistor that is connected between Source and GND also needs to be checked including the Zener diode that is connected in parallel with the that very low Ohm resistor.Attached FilesLast edited by budm; 11-25-2017, 08:27 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: LG47LC7DF Fuse Blows
On the InRush Current Limited (thermister) I can't get the actual part. It's specs are 6ohm 6amp 20%. I can get a 5ohm 6amp 25%. Would that work as a replacement.
Pulled a small Zener Diode from base of bad Mosfet. Readings are .670V and OL. I think that one is ok. Will keep looking for the other componets that Bud mentioned in post 31.Last edited by killian6pk; 11-26-2017, 11:33 AM.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
Bud you asked me to check the components between the gate and the output drive pin of the smps IC attached is a link to that datasheet could you point out the output drive pin?Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
How do you check surface mount resistors diode etc. Do they have to be removed from the board, or can they be read in circuit? Also I have a surface mount component with board identifier FB101, what does that stand for? It reads shorted with my dmm on continuity (both ways). There is no mention of it in the component list in the manual.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
Fb101 is a ferite bead. It is a piece of wire enclosed in iron to reduce interference. It will always read short.Comment
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Re: LG47LC7DF Fuse Blows
fb is probably a ferrite bead so should test short circuit surface mount parts unless i get a odd reading from the part i dont remove them but some diodes will read short circuit in circuit but there ok once removed.Comment
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Re: LG47LC7DF Fuse Blows
What about testing the surface mount resistors? Do I need to take them off the board?Last edited by killian6pk; 12-02-2017, 01:04 PM.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
I have found a diode (black with blue strip) numbers are S3V79 (9 has a line under it and next to nine is a blue dot) can't find datasheet anywhere (internet search, digikey or mouser). On meter diode check setting reads both ways in circuit. Took it out of circuit it reads only one way with OL when leads are switched. Is it likely to be ok? Board designation is a D so not a Zener.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
I finally found a reference to this Diode. They say it is a Rectifier Diode, but still no data sheet. Don't know if that helps or not.Have you ever stopped to think and then forget to start thinking again?
As a very wise man once said on this forum: "Of all the things I have lost I miss my mind the most."Comment
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Re: LG47LC7DF Fuse Blows
if the diode is only reading one way it should be fineComment
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Hi, I'll start by saying that I'm not an expert and I've reached a point where I don't know what to try/do anymore...
Starting from the beginning: I opened this subwoofer for the first time with a very strong smell of burnt electrical components, I realize that on the amplifier board there is a hole between V+ OUT and GND about the size of a finger, the damaged components were the shorted mosfets, two damaged zener diodes and two capacitors. I bought everything, I fixed the hole by cutting the pcb and putting a piece of a perforated board.
I had no problems connecting mosfets and capacitors,...08-27-2024, 12:46 PM -
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... -
I could have sworn I posted about this before, but I can't seem to find the post..
To whit..
I have a 60LN5400 that came in.. Backlights work fine.. No display..
Traced the problem to the TCON board.. Blown fuse..
Replaced the fuse.. Blows again.. Replaced the fuse again... This time it fries the marked part on the Main Video board...
Got a new Main Video Board.. Replaced the fuse on the TCON..
The fuse is fine and the backlights come on fine if I don't have the cellophane connectors from the TCON to the... -
Hello everyone. 😀
As per thread title, this unit has a serious SMPSU fault. It blows F1001, which is a 10A M205 in the phase from the mains input.
Very first thing I tried, was simply replacing the fuse, but the replacement ceramic fuse blew immediately.
Looking at the schematic for this PSU, I then removed what I thought was the next likely candidate: D1001 - the HV main bridge rectifier.
This isolated the fault(no longer blows the main fuse), but does not point me to the actual fault.
There are no devices that have exploded or otherwise show signs... -
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...
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