Re: Decipher part of this please: 4.7U_0805_25V6K
A found a few charts listing the codes for temperature coefficient (tempco) for capacitors, but I'm not sure I understood what 6 actually stands for. It seemed that some of the coding standards had different meanings for a 6. Would someone have a link to an article or chart that would describe what 6 means in this situation?
cook
Quiet observer
Last Activity: 02-14-2022, 05:46 AM
Joined: 05-27-2010
Location: Central Florida
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Re: Decipher part of this please: 4.7U_0805_25V6K
Doing more searches on my question, I was able to finally find something that may make sense on this. A German site had my same question on it and they speculated that the 6K represented the minimum purchase quantity for the item. But I will continue to search on this and post any relevant findings.
One other thing.... In the schematic for this board, they have many capacitors with this label... 4.7U_0805_25V6K~D I thought the 'K~D' was very interesting to note!Leave a comment:
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Re: Decipher part of this please: 4.7U_0805_25V6K
In case it helps, the motherboard is a Compal LA-7781P - Dell Latitude E6430Leave a comment:
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Decipher part of this please: 4.7U_0805_25V6K
From a Dell laptop schematic, they list this SMD capacitor: 4.7U_0805_25V6K
I understand it all except the 6K at the end. What does that mean?
4.7U is capacitance
0805 is size of SMD capacitor
25V is 25 volts.
6K ???
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Purpose of this covering on a Dell laptop system board?
The Dell laptop pictured in this post has an area of the board covered with a dull silver material. It is the large 'square' area on the lower right that sits right next to the two card slots. When I removed it from my board, it felt like it was thick paper that has glue on one side, and the other side has a silvery material on it that crumbles off very easily. As it crumbles off it leaves a silvery color on your skin. Underneath of this cover, there are many chips, and there are two big chips from SMSC, which I assume are for the card slots. Other parts of the board are covered with a sheet... -
Dell E6430 (Compal LA-7781P) Boardview?
Requesting a boardview for Dell Latitide laptop E6430 containing a Compal mainboard model LA-77819P.
I have searched many places for this but can't find it. I found the schematic, but not a boardview.
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Re: Help with mosfet selection for TCL power supply
Thank you Dick-Barton.Leave a comment:
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Re: Help with mosfet selection for TCL power supply
Perhaps I have posted this in the wrong forum... Should I move this to the Power Supply forum? (And also add the model number to the title.)
ThanksLeave a comment:
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Help with mosfet selection for TCL power supply
I am working on a TCL 55s405. I am strictly a novice at electronic repairs.
I have a bad mosfet on the hot side of the power supply board. It is an ap50wn1k0h, and the specs. of it are below.
Will the aod9n50 mosfet be a good replacement for it? Its specs. are below too.
I selected this one because I could not easily find a 7 amp mosfet to replace the bad one, so I went with the next higher amp one I could find that seemed to be close.
Thank you so much.... -
Finding spare chips-What devices used this chip?
I am trying to figure what TV "Set Top Boxes" (STB) used the Broadcom "System On a Chip" (SOC) model 7231zbkfeba03g. I have a DVR that uses that chip, and I was hoping to find an inexpensive way to get some spares of the chip.
Officially, I think Broadcom said the end-of-life for the chip was late 2018 or 2019. But AliExpress says they have new ones in a 5 pack for about $60.00. I would love to find a spare or two for much less than that.
Is there an easy way to find out what devices used the Broadcom chip 7231zbkfeba03g? -
Re: Is this a sign of venting?
Yes, that makes sense. Something may have been wiped across them. I had not thought of that. I will replace them since they are easy to get to, and as noted, they won't cost much. ---- ThanksLeave a comment:
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Is this a sign of venting?
This board is for the controller on a house water heater.
In the center of the picture, notice the yellowish color in the vent grooves on the top of the capacitor. That color is not a reflection from the yellow wire near the capacitor. The color is actually in the groove. The same color is on the cap on the right side of the picture too, but it does not show up as well. I don't think I have ever seen something like this before...
Generally speaking, is that a sign of venting?... -
Re: APC BackUPS LS-500 Schematics?
Sorry Sam_sam_sam,
I don't know what was printed on the next line on the regulator. It is all back together now, and I can't see that part. And it is not easy to get it apart.Leave a comment:
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Re: APC BackUPS LS-500 Schematics?
I finally replaced all ten of the various aluminum radial electrolytic capacitors on the board. The only ones that seemed out of spec. were the smallest ones - 22uF 16V ones, which were blue and made by JiangHai. There are 6 of these on the board. Some of them had very high ESR values. I have been running it for a few days now with the new caps and it is no longer beeping. So I am thinking that they were the cause of the intermittent beeping I experienced. Thank you to everyone who helped me with this fix.Leave a comment:
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Re: Calibrating a YiHua 939D
diff,
Yes, you are definitely right, no question about that. But.... Since it does have a calibration button on it, I'd like to know how it works. Curiosity is a curse... and a blessing.
Leave a comment:
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Calibrating a YiHua 939D
I cannot figure out how to the calibration should work on my YiHua 939D. I thought it would have a dial that you could turn to raise or lower the temperature so it matched the display, but it has a push button. I have not tried it since I did not want to get it out of calibration with no way to get it back. I have searched the 'net multiple times but don't see anything about how to calibrate it.
Does anyone know what the right procedure is for calibrating it? -
Re: Airgap in soldering iron tip
My Yihua 939D uses the 900M tips, as listed in their documentation that comes with the unit. When I use my 939D to compare the 900M tip with a real Hakko T18 tip, I notice the following 2 differences.
1. The hole in the T18 tip is just slightly more narrow than a 900M, but it still easily slides on the ceramic heating element.
2. The T18 is about 1mm shorter than a 900M. When you put on the T18 tip, it does not slide all the way down ceramic heater to where it should meet the metal sleeve. I think I will make a small metal spacer to...Leave a comment:
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Re: Airgap in soldering iron tip
I believe I may have gotten the wrong Hakko tip. Somehow I thought the T18 was the same as a 900M. But I am seeing now they are slightly different and the T18 is just a tad shorter than a 900M. Is that the only difference? I am hoping that although they are different, I may not really notice the same as long as I am very careful and don't over tighten nut that holds the tip on.Leave a comment:
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Re: Airgap in soldering iron tip
I have a Yihua 939D. I will be using a genuine Hakko tip on it - T18 BR02
I also have a RadioShack Pro Line 70W -- similar style iron.
One post suggested copper paste, an anti-seize compound that can take high heat. I have not tried the paste myself, but I was wondering if anyone had tried it and if it made much difference. Maybe that post was specifically addressing the air-gap in a Weller iron.Leave a comment:
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Airgap in soldering iron tip
Some soldering tips do not fit on the heater element very tightly and you end up with an air gap between the tip and the heater core.
What experiences has anyone had using high temp copper paste or silicone grease to fill the air gap and get better heat conductivity on the tip?
Did it work well over time?
Or maybe you used something else to fill the air gap?
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