Hello I have a data sheet from one of the circuits on my board can someone please help me determine if it is bad or not. All I have is a voltmeter so if you could explain to me how to test it that would be great
Thanks for your help
Just learning
Paul
1811151434_OB-On-Bright-Elec-OB2530PAP_C78848.pdf (764.1 KB)
Can you provide the schematic of your circuit? What are you wanting to test?
Good morning Jenny
Thanks for getting back to me. Here is the data sheet for the ic circuit. I need to find out if it is working. I have no idea on what to check for or to tell if it is good or bad all I know is that my board has no power and the fuses are good and the capicitors are good. Any help would be great on what I should be testing it for.
Paul
I do not have a schematic of the circuit board but I can probably draw something or send pictures.
Hello Paul,
Troubleshooting is an art.
One of the more challenging aspects is identifying the major section of your equipment. For example, if your equipment included this large SD-100A-5 DC to DC converter, it’s easy to identify the inputs and outputs:
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Inputs: Set your meter to DC and place the probes on the red highlighted terminals. A good reading is between 9.5 and 18 VDC
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Outputs: Set your meter to measure DC and place the probes on the green highlighted terminals. A good reading is about 5 VDC.
The thought process for your PCB is the same. You must identify major section of the circuitry.
For the On-Bright datasheet you provided, the equivalent tests points are highlighted in this picture.
Troubleshooting as an art
From here, things get complicated. This particular circuit features a feedback (output monitoring) circuit origination in the N_{AUX} winding of the output transformer. In my opinion, this type of circuit is very difficult to troubleshoot as it’s all or nothing. For example, the circuit is self-powered via the aux winding. If it is working correctly, there will be power on the vdd pin. If it’s not working, there are no voltages to test.
You can use your meter to perform continuity tests to determine if the transformer windings are intact. Unfortunately, there could be other transformer problems such as interwinding shorts that are undetectable with the meter.
If I could offer advice, this is not the circuit to begin your troubleshooting journey. Even the most experienced technicians will have problems with this all-or-nothing circuit.
Safety
Personally, I get very nervous when working with line powered equipment. And for good reason as so many things can go wrong. Electrocution is an ever-present danger. Also, mistakes tend to result in fire. This could be explosive fire that destroys the device or a smoldering heat that burns down a house.
Please let us know if you have a specific question.
Until then, be safe.
APDahlen
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Good morning Jenny here are acouple pictures of the board. It goes from the outlet(120v) to the large circuit board down to the small board with a touch control wire to a 1watt led light fixture
Okay, so it looks like that brown PCB is the one that would be referred to as the “major section” of this assembly. Your inputs would be the terminals with the white/black wires attached, and outputs would be the terminals with the red/black wires on the other side.
Looking over these photos generally, I’m afraid I don’t have much to add beyond the guidance that was previously posted regarding troubleshooting. If you haven’t already I recommend giving the previous post from APDahlen further up the thread a read.