Re: Can anyone help me identify this transformer?
I can see the pictures in post #1, #5.
I can see the pictures in post #1, #5.
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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=24809 -
Re: Can anyone help me identify this transformer?
different browser settings.
hardly the point - the foto's wont last long at that url - i learned that the hard way & stopped using these "cloud" bastards.Comment
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Re: Can anyone help me identify this transformer?
I know I know, photobucket is garbage........
I feel like I should be checking both the big cap and the diodes for leakage, I read something like if they're faulty a large ripple current will be sent through the cap causing overheating, any truth to this?"You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
Upon further inspection it seems that there are a few more suspicious caps I didn't see, could one of these be the culprit?
"You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
Interesting development.........
I was able to power up the panel with the case off, turns out it's not the transformer that's overheating but rather the cap circled in this picture, which is on a separate board. The cap was cracked open and burnt so I replaced it but the new one is getting just as hot, and it happens much quicker than I previously thought.
Between this thread and my other one with the displays for this panel, this project is quickly turning into a trail of fail
Last edited by WHaThEFLuX; 05-24-2017, 07:04 PM."You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
More shots of the board...
This picture is of a donor board, the cap shown is the one that's overheating on the actual board
Last edited by WHaThEFLuX; 05-24-2017, 07:21 PM."You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
Do you have any ideas why the cap is over heating9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *
These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%
1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board
All of these had
CAPs POOF
All of the mosfet that are taken out by bad capsComment
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Re: Can anyone help me identify this transformer?
I'm hoping the experts will chime in and have an idea of what's going on.
When I test all those caps on a good board in circuit(not a reliable test) they behave normally(I get a reading then it jumps to OL or just says OL.)
On this board, all of the ceramic disc caps give me a steady reading of ~.500
Something's definitely not right......."You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
do you have a scope and/or a frequency counter?Comment
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Re: Can anyone help me identify this transformer?
I don't unfortunately, it's the last tool I need, the more I work on electronics the more I realize how priceless it is."You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
Are you sure thats a cap. and not a ntc thermistor or maybe a MOV is it marked RV? next to the removed RV2 If its a thermistor it will get warm, if its a mov it is most likley badComment
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Re: Can anyone help me identify this transformer?
It is marked RV1 on the board, here's the specs: http://www.alliedelec.com/m/d/2f6776...201ab01eb3.pdf
I'd understand it getting warm but it's getting burning hot within seconds while the one right next to it is completely cool"You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
Which value/part number did you installComment
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Re: Can anyone help me identify this transformer?
EZRV20D241 - V20241U
It was an exact replacement from another board"You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
Its a Transient/Surge Absorber, If its getting hot its getting more than 150v a/c or more than 200v dc according to the specs, It is across the 120v a/c line?Comment
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Re: Can anyone help me identify this transformer?
Do you have the wiring diagram to find out what kind of Voltage is supposed to be applied to those two terminals?Attached FilesNever 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: Can anyone help me identify this transformer?
If you're looking at the picture, the terminal farthest to the right is ground and the other one is 120VAC"You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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Re: Can anyone help me identify this transformer?
So that MOV is across the LINE which how it is used, in normal condition it should not be conducting any current at all. It is for protection, not for the operation of the circuit.
So for it to get really hot like that, I would remove it and see what kind of resistance you are getting.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: Can anyone help me identify this transformer?
Panasonic ERZ-V20D241
http://www.mouser.com/ProductDetail/...jQGa7MJQ%3D%3DNever 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: Can anyone help me identify this transformer?
Thanks bud, it's interesting because once I changed it out the same thing happened, you want me to measure the resistance of the MOV? Surely I didn't replace the bad one with another bad one........that current must be coming from somewhere it shouldn't be, maybe I'll test that with a working panel....."You can only learn so much doing simple recapping and fixes. Ideally you want a really hard one to fix where you end up with a lot of dead ends and frustration. Then, and only then, do you learn how things really work."
-retiredcapsComment
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