Forum: General Capacitor Questions & Issues
10-16-2021, 07:41 PM
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Replies: 7
Views: 947
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...
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Forum: General Capacitor Questions & Issues
10-16-2021, 07:24 AM
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Replies: 7
Views: 947
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...
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Forum: General Capacitor Questions & Issues
10-15-2021, 04:45 PM
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Replies: 7
Views: 947
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Forum: General Capacitor Questions & Issues
10-14-2021, 01:44 PM
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Replies: 7
Views: 947
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...
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Forum: General Computer & Tech Discussion
10-14-2021, 07:37 AM
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Replies: 0
Views: 393
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Forum: Schematic Requests ONLY!
10-01-2021, 05:54 AM
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Replies: 3
Views: 1,311
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...
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Forum: Troubleshooting TVs and Video Sources
06-16-2021, 08:48 AM
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Replies: 3
Views: 410
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Forum: Troubleshooting TVs and Video Sources
06-16-2021, 04:13 AM
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Replies: 3
Views: 410
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Forum: Troubleshooting TVs and Video Sources
06-14-2021, 02:40 PM
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Replies: 3
Views: 410
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. ...
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Forum: General Computer & Tech Discussion
03-21-2021, 10:59 AM
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Replies: 0
Views: 490
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...
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Forum: General Capacitor Questions & Issues
01-25-2021, 05:30 AM
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Replies: 4
Views: 1,597
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. ---- Thanks
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Forum: General Capacitor Questions & Issues
01-24-2021, 10:27 AM
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Replies: 4
Views: 1,597
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...
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Forum: Troubleshooting Power Supplies and Power Supply Design
09-10-2020, 04:53 AM
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Replies: 28
Views: 3,530
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.
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Forum: Troubleshooting Power Supplies and Power Supply Design
09-03-2020, 02:17 PM
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Replies: 28
Views: 3,530
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...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
09-01-2020, 09:23 AM
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Replies: 3
Views: 1,626
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. :)
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
09-01-2020, 03:51 AM
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Replies: 3
Views: 1,626
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...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
07-20-2020, 04:40 PM
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Replies: 11
Views: 2,041
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...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
07-20-2020, 04:57 AM
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Replies: 11
Views: 2,041
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...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
07-19-2020, 07:04 PM
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Replies: 11
Views: 2,041
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...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
07-19-2020, 12:08 PM
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Replies: 11
Views: 2,041
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...
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-09-2020, 05:22 AM
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Replies: 28
Views: 3,530
Re: APC BackUPS LS-500 Schematics?
I found a regulator. It is a LM2575T. I will be tracing down the caps that are next to it.
It may be next week sometime before I have any results, but I will post what I find.
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-05-2020, 02:58 PM
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Replies: 28
Views: 3,530
Re: APC BackUPS LS-500 Schematics?
I may need some help in identifying if the board has a regulator. Would that be one of the IC chips that I listed in an earlier post? Or is it something else on the board? I have pictures of the...
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-04-2020, 06:51 PM
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Replies: 28
Views: 3,530
Re: APC BackUPS LS-500 Schematics?
Got it, I will be replacing larger brown and black caps. I may do some more trouble shooting on the board first just to see if I can find other bad caps too.
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-04-2020, 06:49 PM
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Replies: 28
Views: 3,530
Re: APC BackUPS LS-500 Schematics?
sam_sam_sam,
I am currently identifying what capacitors are connected to the pins on the chips.
Am I only interested in the caps that are first component I find on the trace, or should I be...
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-04-2020, 01:52 PM
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Replies: 28
Views: 3,530
Re: APC BackUPS LS-500 Schematics?
Thank you for the schematics!!
And thank you for noting that cap. I just looked closely at it, and it is has a slight depression across part of the top. It almost looks like something pushed...
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