9
Troubleshooting
No picture and blue ZX-HD led stays off
It sounds as if there is a short-circuit: check the soldering contacts on the Raspberry Pi Zero.
No video output
Always first power on your TV before powering up your ZX Spectrum: the ZX-HD negotiates the
resolution with the TV.
If you do not get video output of your ZX-HD, this may be caused by a display or other HDMI device
that does not return EDID (Extended Display Identification Data) which is needed by the ZX-HD to
determine the output resolution settings.
However there are some ways of solving this by adding one or more of the below configuration sets
to the
config.txt
file on the micro SD card of the ZX-HD.
Try one set at a time and a combine them only if there is no result:
Set 1
# try to boot with maximum HDMI compatibility:
hdmi_safe=1
Set 2
# ignore EDID/display data if your display doesn't have an accurate EDID:
hdmi_ignore_edid=0xa5000080
Set 3
# force output resolution
hdmi_group=1
# and only one of these:
hdmi_mode=8 #240p
hdmi_mode=9 #240p 16:9
hdmi_mode=12 #240p quadrupling
hdmi_mode=13 #240p quadrupling 16:9
hdmi_mode=23 #288p 50Hz
hdmi_mode=24 #288p 50Hz 16:9
hdmi_mode=27 #288p 50Hz quadrupling
hdmi_mode=28 #288p 50Hz quadrupling 16:9
Other problems
Check the soldering contacts on the Raspberry Pi Zero.
Check zx-hd.bytedelight.com for more troubleshooting hints.
