Reply To: OSSC issues: One overvolted & Second no HDMI out?

[Morpheus_79]

For the first one:
Check if F1 has continuity and if the voltage regulators aren’t shorted. You can check the voltage regulators as described here:

https://github.com/marqs85/ossc_pcb/assembly/assembly_tips.txt at

Before turning on power (DC 5V / center positive / min. 1A supply), it’s a good idea to check that power supply lines are not shorted to ground. It can be done easiest by checking all the regulators:
-on bottom side, there are 8 small regulators in SOT-23-5 packages (U6, U7 etc.). Verify with a continuity meter that only the middle pin on the side with 3 legs is connected to ground
-on top side, there is one larger regulator (U5) behind the display. Verify that only the middle pin (on the side with 3 pins) and the heatsink pin are connected to GND

For the second one:
Do you get the gray test image without any input source? If not, U3 may be damaged.