Hello, I’m currently working on a PS5 EDM-030 board, no display, seems to boot fine. Replaced the HDMI port and encoder IC, still no display. Using this reference image, all of these values with the exception of the 0.9v (dark green highlight) are present. Instead of getting the 0.9v reading, it’s reading 0.012v. I did try swapping the RJ IC with a 504x IC from an EDM-010 board, and the voltage was even lower.
Are these voltages consistent across the board versions? And if so, where should I be checking to find the underlying issue?
Please check the both resistors at the left side of the RT9048A (RJ=xx). The resistor R1 top should read aprox. 1.48 kOhms and down one R2 3.8 kOhms. This resistors are defining the output of the chip. [Vout = (0.65 (R1 +R2)) / R2] (https://www.richtek.com/assets/product_file/RT9048A/DS9048A-00.pdf)
If the resistance on R1 and R2 is ok check for a cap which is off and should getting hot.
(Ignore the brighter green 0.9V line)
Thanks so much for the reply and suggestion. Both resistors read about 1.8kohm. Once removed from the board, each resistor read closer to the correct resistances you stated. I also checked all the caps in that area, none appear to be shorted or getting hot, though I don’t have a voltage injection tool at my disposal. Taking voltage readings in that area highlighted with the dark green, they appeared to show .68v, but then checking again they’re back to .012v.
Thank you again for the reply. Yes, 1.95v and 5v are present. Using my bench power supply and hitting the power button, I briefly get 3.3v at those locations.
I would remove the HDMI chip again and see if the 0.9V are present without the chip.
If the 0.9V are not present, I would replace the resistors and the both caps (small and big one) at the outputside of the RT9048A and check again.
And check the caps around the HDMI chip front and back.
