The first thing I would do is powered up the board (current limited) turn it upside down and measure the forward voltage of all the PN junctions of the transistors and diodes and check that you measure around 0.65v
I'm assuming the output your talking about is PD+ or ND-
@Mainframe @RickRay mentioned he is testing the IPS in isolation so I'm assuming that he's testing this first
I want to bring to your attention an important issue regarding the PCB boards that have been recently circulated. I'm talking about my T-GND and Ground lift boards. It has come to my notice that these boards were copied without my permission or consultation.
As a community, it is vital that we respect each other’s work and adhere to the principles of collaboration and intellectual property. Unauthorized copying undermines the effort that goes into creating and sharing designs, and it’s essential that we all uphold these standards to foster a positive and respectful environment.
I have boards available if anyone would like them. Just send me a PM
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Thank you @plasticator, and I appreciate your openness in addressing this situation. Please rest assured that I have no concerns regarding your purchase. It’s perfectly understandable that you were unaware of the situation.
Your contributions to this project are valued, and I’m glad you’re part of the community. If you have any questions or want to discuss this further, feel free to reach out.
I’m pleased to confirm that the PCB dimensions for V5 are essentially the same as those of V4. Additionally, the mounting hole locations and output transistor placements remain unchanged. This means that you should be able to use the same power supplies and enclosures without any issues.
Your boards were not copied, they were improved on and not even the same. Copying would be implying that I took your boards and made exact ones, which I did not, even the layouts are different.
Regarding the new and improved PCB. While the schematic remains largely the same, we have made some enhancements. Specifically, a few additional components have been added to both the IPS and EF3-X boards. A small number of resistor values have been updated. This was necessary to accommodate the changes mentioned in my original announcement.
I'm pleased to share that 100% of the components on the EF3-X boards are reusable, and approximately 90% of the components on the IPS boards can also be reused.
I will discuss with the group the timeline and details regarding the release of the V5 schematic.
Thank you for your continued interest and support!
Regarding new boards. Sounds like the majority of changes are on the IPS board. Since they are easily changable, have you condidered making only the new IPS boards available. That is, if they are compatible with the old boards.
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As an FYI to anyone having almost rail voltage on the PD+ and ND-, since they are connected together to test the IPS in isolation, Q3 and Q4 were switched with Q5 and Q6. None of the transistors were harmed, hard to believe.
Yikes. That is unbelievable. And lucky. Better to be lucky than good [this time].