Reply To: v.1.7 not working even after JTAG flashing; how to debug?
I don’t know how to tell if I have the reference design or a clone.
That’s not the reference design. U5 is rotated and it uses a different display with a flat flex cable connection, while the reference design uses this vertically mounted New Haven Display:
How can that be if you say U6 powers it?
I said: U5 powers it!
how about I connect the output of U5 to the output of U6 since you said they’re both 3.3V
I’m no electrical engineer… but there’s certainly a good reason for using two different regulators for the two 3.3V voltage rails. U5 drives the flash memory, the oscillator, the digital power (low noise) part of the audio ADC (U8) and the digital power (low noise) part of the TVP7002PZP (= U1 = the video ADC). U6 drives the analog power part of U1 and U8, and it drives U17 (the 3-Channel video buffer). Connecting U5 to everything U6 drives surely doubles its load. And while it may be able to withstand it, it could introduce noise to the digital power part of both ADCs AND there may be a broken component on the output line of U6 (while U6 itself is NOT broken)… which could subsequently kill U5 (and/or components connected to it) or at least damage your OSSC further.
Your OSSC does not use the reference design – that’s why it’s hard to tell, which voltage regulators are swapped for cheaper or more readily available parts. So i would not stress them any more than necessary. First: look if U6 itself is broken (= remove it and see it the short is gone)… if it is: look if it’s a TLV70033 (the markings can give a clue) and find a replacement.
