repair-it
Senior Member
Last Activity: 06-05-2025, 10:42 AM
Joined: 11-06-2020
Location: Long Island NY
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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. -
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. [I]No integrity IMOP. [/I]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...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.
[ATTACH=JSON]{"data-align":"none","data-size":"large","data-attachmentid":3537162}[/ATTACH]... -
No they aren't, The service manual is only 3 pages of useless info....Leave a comment:
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Pioneer VSX-40 ,Trying to ID these resistors
I am trying to determine why these two resistors are the colors that they are. This is a Pioneer amp. The ones I am concerned about are the RED & GREEN colored resistors. I need to replace them and want to be sure to use the properly rated component....
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ok, thank you. Are the VSX series boards pretty much the same layout? The one I have turns off right after being powered up. It was working then nothing. So far I have verified the thermal fuse in the transformer is good but this thing is packed so tight it's going to be a nitemare to troubleshoot.Leave a comment:
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Seeking pioneer elite vsx-40 schematics
I'm trying to locate a set of schematics for a pioneer elite vsx-40. -
I am look for a DOCUMENT as stated. It is mentioned in a repair pdf for ECU repair @ [url]www.XiuFix.com/ecu[/url]https://I am look for a DOCUMENT ass....com/ecu[/url]...Leave a comment:
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AutoLeap Oscilloscope Handout
Searched online but wasn't able to find. Trying to locate a copy of this document - AutoLeap Oscilloscope Handout. -
[B][I]Thank you all for your replies[/I][/B]. The issue was a fault code indicating the battery(s) were not charging. I am limited in how I can test these boards as I do not have 2 12v batteries available, I have monitored under a thermal camera and the only component getting hot is the voltage regular but the temp is within spec. The customer wanted all relays replaced as they tend to 'hang' and the supplier told him that the fix was to tap it with a hammer.🤣 I was hoping that someone who designs circuits could look at the way this board is laid out and maybe explain how the charging part...Leave a comment:
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Yes, you are correct. It is powered by 2 12v lead-acid batteries. I have tried to trace the charging portion but not easily. I did discover that the microprocessor is involved as is the relay. Maybe the microcontroller went bad. Not sure if that's a possibility. I haven't encountered any faulty components along the way so far....Leave a comment:
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Engineering help - how does the charging circuit on this board work?
This board attaches to 2 12v batteries in tandum (Black/Red squares). There is a 24v power supply that attaches at the 2 pin molex connector (circled in red). I need help to determine which components run the charging circuit in an effort to determine a point of failure. There are multiple via's, making it difficult to trace the circuit. Nothing appears to be shorted but I wasn't able to fully test as I do not have 2 12v batteries available. My assumption is that the micro controller (red question mark) determines when to turn the charging circuit on & off. I'm pretty sure a regulator and... -
Midea Control Board from Home Depot MiniSplit
I am trying to determine what these components are, used a jumpers. I am not sure if they are ferrite or something else. Board ID is EU-KFR80W/BP3(IR311+PS21997+SIM6822+LOCK).D.13.WP2-1. A service tech shorted the area underneath these components, which were covered in carbon. They are also used in another place on this pcb but I'm not sure what they are. I have not removed them to measure yet. They do not have a label on them.
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