Why Does My HDMI Output Blanks Periodically?

[andrezheng]

128M SDRAM module installed on GPIO_0
Please help check the attached video.
Thanks

[AngelicLiver]

What is vsync_adjust set to in your MiSTer.ini and which power supply are you using?

[edit] I've also noticed the memory icon is indicating that no SDRAM module is installed, you might want to check it is installed correctly.

[andrezheng]

What is vsync_adjust set to in your MiSTer.ini and which power supply are you using?

[edit] I've also noticed the memory icon is indicating that no SDRAM module is installed, you might want to check it is installed correctly.

Thanks for your explanation. The vsync_adjust is set to 0. And yes, the SDRAM module is actually installed but not detected. Myabe the SDRAM is broken . So my question is this main menu display also needs SDRAM module?

[AngelicLiver]

The main menu does not need SDRAM but installed incorrectly it can cause issues (or even damage the DE10-Nano). I've seen power supplies with insufficient amperage causing problems like this too.

[andrezheng]

Power supply is using the one in the DE10-nano kit.

[andrezheng]

The main menu does not need SDRAM but installed incorrectly it can cause issues (or even damage the DE10-Nano). I've seen power supplies with insufficient amperage causing problems like this too.

Thanks again. I'll check all the three things you mentioned.

[AngelicLiver]

Power supply is using the one in the DE10-nano kit.

I would strongly consider upgrading that; it doesn't really have the amperage to run the DE10-Nano along with connected peripherals with higher power draws.

[thorr]

Also try a different HDMI cable.

[andrezheng]

Update
Failed with below tests, Still periodically blanks:
(1)vsync_adjust = 0
(2)vsync_adjust = 1
(3)vsync_adjust = 2
(4)Installed 128 SDRAM module correctly
(5)Use different 5V power supplys

[Akuma]

If you have other CEC capable devices in your setup, decouple them. If the problem still persists its not CEC. If it goes away, you need a CEC-blocker.

But if I we're a betting man I would go with @AngelicLiver 's suggestion and try a proper 4A/5V power supply and start with a bare minimum setup, just to rule other components out.

[andrezheng]

I've found this in the log file when blamk screen happens. Why the i2c bus can't be found? Is this i2c related to SOC<->ADV7513 or ADV7513 <-> HDMI Monitor? Anybody knows this? Thanks

INI_PARSER : Opened file yc.txt with size 7680 bytes.
INI_PARSER : Got yc_mode 'JTCPS1_59.6' with VALUE 40997539300
INI_PARSER : Got yc_mode 'JTCPS15_59.6' with VALUE 40997539300
*** ADV7513 not found on i2c bus! HDMI won't be available!
*** ADV7513 not found on i2c bus! HDMI won't be available!
EDID: cannot find main i2c device
Calculate PLL for 74.2500 MHz:

[andrezheng]

I've found this in the log file when blamk screen happens. Why the i2c bus can't be found? Is this i2c related to SOC<->ADV7513 or ADV7513 <-> HDMI Monitor? Anybody knows this? Thanks

INI_PARSER : Opened file yc.txt with size 7680 bytes.
INI_PARSER : Got yc_mode 'JTCPS1_59.6' with VALUE 40997539300
INI_PARSER : Got yc_mode 'JTCPS15_59.6' with VALUE 40997539300
*** ADV7513 not found on i2c bus! HDMI won't be available!
*** ADV7513 not found on i2c bus! HDMI won't be available!
EDID: cannot find main i2c device
Calculate PLL for 74.2500 MHz:

I used oscilloscope to monitor the SDA/SCL signal bus of SOC<->ADV7513. There's correct signal detected on I2C bus during boot up stage. The i2c signal lost when I choose to load any game. Weird.