Re: Can you test a silicone rectifier with a MM?
2.103 'M' Ohms? That is 2.1 Millions OHMS., no it is not shorted.
2.103 'M' Ohms? That is 2.1 Millions OHMS., no it is not shorted.
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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 you test a silicone rectifier with a MM?
So how come on the irfp9240 its was only 0.511m ohm and this irfp240 its 2.103m ohm. Quite a difference.
Anyhow some snaps of the board and readings from the irfp240. The polarity on this one is the opposite of the other, is that normal?
Sub is blowing the external T2a fuse. Internal fuses are ok (They are encapsulated T3.15a fuses)
The silicone rectifier measures ok and only one way in diode mode @
0.48v
0.48v
0.5v
0.48vAttached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by mikay786; 11-22-2015, 06:06 PM.Comment
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Re: Can you test a silicone rectifier with a MM?
So how do the rectifiers get the AC from? A power transformer somewhere we are not seeing in the pictures?
Make and model of this sub?Last edited by budm; 11-22-2015, 06:40 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: Can you test a silicone rectifier with a MM?
Did you use time-delayed type fuse for the main fuse?
Does the main fuse blow if the secondary of the transformer is not connected to the rectifier?
The TOROID transformer has very high inrush current when power is first applied to the transformer winding.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 you test a silicone rectifier with a MM?
Yea I only had T3a glass fuse which I pulled out of another sub and it blew that. Its the fuse at the back of the sub.
The fuse in the AC cord is ok.
Erm ive not tested with the transformer disconnected yet. Which colours are the secondary (All of them connecting to the main board). Theres yellow, grey, blue and red going into the main board.Comment
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Re: Can you test a silicone rectifier with a MM?
Speakers hasn't been connectedComment
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Re: Can you test a silicone rectifier with a MM?
Can hot glue cause a short? Large sections of the board was covered in hot glue which I have removed, but tested with glue on.Comment
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Re: Can you test a silicone rectifier with a MM?
no.
try running it through a light-bulb to limit the inrush.Comment
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Re: Can you test a silicone rectifier with a MM?
Yes T3a fuse just blew only connected to transformer, so transformer is bad? No wires connected to mainboard.
Somebody has already been inside this sub, I'm wondering if this is wired correctly. UK 3 pin socket
Rectangle is fuse. Top of triangle is top pin.Attached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by mikay786; 11-22-2015, 07:41 PM.Comment
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Re: Can you test a silicone rectifier with a MM?
no earth connection!!Comment
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Re: Can you test a silicone rectifier with a MM?
TTO-10717-02 transformer
2x33v
1.21aComment
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Re: Can you test a silicone rectifier with a MM?
There's no other cables inside, just two orange cables.Comment
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Re: Can you test a silicone rectifier with a MM?
So there are two orange wires on the transformer then?
What is that big black blob on the top left with black cable tie on it?
https://www.badcaps.net/forum/attach...2&d=1448240886
You can probably get other transformer to replace it.
Do you have any scraped linear power supply?Last edited by budm; 11-22-2015, 08:39 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: Can you test a silicone rectifier with a MM?
2 in and 4 out to the board. The black blob is just a cover that goes over the terminal.
Stj mentioned no Earth on the AC in the terminal, but that only has 2 wires going out of it into the transformer.Comment
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Re: Can you test a silicone rectifier with a MM?
To earth would I just make a connection from the ground/earth pin on the terminal to say the bolt next to it making contact with the chassis?Comment
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Last edited by budm; 11-22-2015, 08:52 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: Can you test a silicone rectifier with a MM?
Is it possible to repair transformer?
I don't think it will be possible to get a replacement?Comment
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Re: Can you test a silicone rectifier with a MM?
if there is insulation breakdown near the end you may be able to do something.
can you get any meter readings between the primary winding and any of the outputs?
(i hope not)Comment
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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=24809Comment
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I read EBOOK of Testing Electronic Component and found that
"In order to test the small blue resin coated ceramic disk capacitor which has 104 50v specification,it is possible to test this small ceramic capacitor by making use of analogue meter.
Set to times 10Kohm that has 12v output from the probe to check disorder of ceramic capacitor.
It is not uncommon that testing result of digital capacitance meter is okay,But It show shorted reading when you check it with analogue meter."
Is it really possible to test small ceramic disc capacitor with analogue... -
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
Hello
I have power adaptor(220V/input, 12V 1.2A/output) which has symptom of fluctuating output DC voltage between 11.5V-12.2V.
So I opened its plastic case and when switched it on, I heard constant tik tik sound from inside its PCB.
I measured DC voltage between negative and positive pin of the largest capacitor(400v 10uf) and it was measured contant 300V.
I also measured ESR value of all capacitors and I noticed that one of capacitor(KMG 16v 470uf), which located in the secondary side, have high ESR value(10 ohm),So I replaced it with same specification NXH capacitor.... -
2+ year old TV with many (720? 65" version has 720) mini LED dimming zones. TV boots, has sound, panel picture can be seen with flashlight. No backlight. No TV model sticker on rear panel (Maybe Samsung service removed it, read below). Found the model # through the PSU and zoned LED driver board numbers.
PSU has a click near LED output circuit at 1 second interval, sounded like the 4x barrier rectifier area. Protective pastic liner under PSU shows heat signature on the Schottky Barrier Rectifier in this circuit. Found a shorted diode (2 diode per rectifier, failed rectifier labled... -
Back in 2020 i bought a (2nd hand) compact ATX psu to replace my current one. My PC case only fits very short ATX power supplies so i didn't really have the choice of buying a decent 80Plus unit. The current unit is a modded YoungYear unit that i made a thread about a while ago:
A "nice" YoungYear unit? - Badcaps
The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish....
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