News:

Printed Amstrad Addict magazine announced, check it out here!

Main Menu

GX4000 no video output

Started by icwiener, 11:12, 30 April 22

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

icwiener

Hi to all!! a pleasure to be in this forum.

Recently i purchased a broken GX4000 from ebay. The console has no video/sound output, i make some test on it:

-No video output from SCART
-Voltages are normal (stable 5v in z80, ram... 7805 ok)
-When power on with Burnin Rubber cartridge there is no sound output on headphones.
-The clock seems to be ok (i have 4 mhz clock in z80, acid...) perhaps the ASIC be ok? (see the picture)
You cannot view this attachment.
-The RAM seems ok, no excessive heat on it
-When power on with lab power supply at 11v, it draws 0.46amp (look to be normal)
-Seems to be pulling data from the eprom (see the capture with chinese logic analyzer and pulseview)
You cannot view this attachment.

I'm newbie with GX4000 and CPC. Any suggestion to continue with tests?

Thanks in advance.  :)

Kind regards

Powered by SMFPacks Menu Editor Mod