repair-it
Senior Member
Last Activity: 10-04-2025, 08:26 AM
Joined: 11-06-2020
Location: Long Island NY
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thank you. -
Trying to locate this connector
I know this is a long shot..trying to find this socket, which appears to possibly be custom made. It was damaged and has 9 pins missing. It is part of a control board for a local pharmaceutical company. It is a 20 pin socket that measures: 11.75mm (W) x 4.9mm x 6.6mm(H) The manufacturer as expected, was not helpful. -
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Will re-post pics, not sure where they went. Went to Wurth website but I don't have any specs for this other than it's on the AC side of the board (120v) so not sure about a replacement. Not sure if those ID numbers help. Rep in the Wurth chat couldn't help.Last edited by repair-it; 07-23-2025, 09:57 AM.Leave a comment:
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Norcold DE-0061 AC/DC power supply inductor?
I am trying to determine what this inductor is. It was already removed from the board when it was brought in for repair, my guess to prevent the AC part of the circuit from operating, The main cap is also blown. The DC part of the board is still functioning. There is a second identical inductor on the board in mint condition. Not sure why this one failed but would like to replace it but not sure where to find.... -
Trying to determine a fault, not sure if the culprit is LM2574 pin 7 output is grounded
I'm not sure if this is correct, the output pin 7 is grounded or the ic has a short. I'm just trying to rule it out. https://www.ti.com/product/LM2574?qgpn=lm2574 -
Thank you for the replies, seems to be fine once I tested it out of circuit.Leave a comment:
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Need help identifying this (double?) diode
I tried to locate online without any success but maybe someone else might have better luck. If it is a double diode - it's done - based on the reading I got in diode mode....
Last edited by repair-it; 07-14-2025, 10:28 AM. -
Thanks - wish it was that simple. These boards are know to fail due to a disc capacitor cracking, leading the failure of at least one power mosfet which in turn, can cause a failure of the pfc ic. Replacing the shorted mosfet and 4 disc caps, resulted in a nice little mosfet explosion. The next step is to verify that the pfc ic is or is not damaged - that is what I am attempting to do.Leave a comment:
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Need advice testing a samsung power supply board with scope
I am attempting to test a samsung power supply board to verify the pfc ic is working. I am powering up the board with my isolation transformer. The board turns on fine but when I attempt to connect the ground for the scope probe, it trips out the isolator. I was taught not to 'float my scope' so I am wondering if I should test without connecting the ground lead or would that be asking for trouble? Not sure how else to test, I don't have a portable scope. I could plug direct to mains power but that would bypass the safety factor. -
Thank you for that info. Can you tell me how critical the frequency is? I found a few but the listed frequency doesn't match the chart.Leave a comment:
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Need help verifying this MOV
Just need some help to confirm what this mov is. So far all I can make out is N241K & JVR. I'm not familiar with these but hoping someone is....
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Need help determining capacitor value 10C
Not sure what the value is for these caps labeled 10c. I know the WJ is 16v....
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Should I expect to see a wave pattern or just flatline DC voltage?Leave a comment:
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Thank you for those details. I'm not sure what type of gate signal I should expect. All grounds are connected to a single connection which then goes to the IC ground pin. Applied 14v to VCC. When applying 3v to VSENSE on the original IC in question, I am getting either a spike-like signal or I get just a flat line DC voltage output. I had expected to see a pulsing square wave. On the replacement IC that I just received from Digikey, connected the same way, I'm only getting a flatline low DC voltage output on the gate. I'm just trying to determine what the gate output signal should look like....Leave a comment:
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How test a 16 pin PFC IC 28063D
Can anyone tell me how I can test a 16 pin PFC IC 28063D out of circuit? I tried applying 12-14v to VCC but did not get a signal on either gate out pin. I read elsewhere for a different PFC IC that it requires 1+v on VSENSE at the same time to get a GATE signal. Just seeking the correct method. -
Well, if you want to learn how complicated MCU's are to fix, then yes. In reality it takes more than a scope. It requires specialized testing equipment and pricey subscriptions to other services that provide the specific information required to work on them along with a pretty steep learning curve. Putting voltage into one of these without knowing what you're doing could cost you thousands. M. Salazar has videos on Youtube if you want to see how it gets done.Leave a comment:
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How to check PFC IC UCC 28063 for possible short
Need help. Samsung 75" TV has an issue with the power supply board. I found a shorted mosfet & blown fuse. I replaced both but the mosfet blew up. I suspect that the PFC driver IC is bad but not sure how to go about checking it with a MM....
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The link is posted above.
The manual mentions it as a reference on how to properly set up a scope to test MCU's.
It does not give a link to the actual document but suggests were to find it but apparently that seems to be incorrect information. The individual who produced the pdf does not offer any support even though he asks for feedback. No integrity IMOP. At this point, I doubt the info exists. I've tried to find it, inquired to the company that supposedly produced the mentioned document as well as the author of the pdf that recommends the document in question but never...Leave a comment:
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How to test this IC (IC400)
Is there a way to test this IC? I have a signal tracer, signal generator & scope, just not sure about injecting signal procedure. Would this audio IC require voltage applied in order to test it? It is located in a Pioneer Elite VSX-40, current fault is no sound, right front channel went bad and has been repaired by replacing 2 transistors and 4 resistors.
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