lopaka1998
Active member
Hi all,
I have an LCIII which was working fine but now has absolutely no audio whatsoever. No squeaks, no interferance or bad ground noises - nothing. I have tried almost everything I can think of - replacing the battery, zapping the parameter ram, checking the power supply's outputs with a DMM (5.10V, 11.84V, -4.9V) - which are close enough to be in working fine. I've removed the 68882 fpu, removed the AsanteLite pds ethernet card, removed the extra 32MB RAM chip and extra video memory chip, swapped the speaker from another (working) LCIII. I've reseated the roms - and even swapped them with the LCIII that I know for sure works - no go.
Please keep in mind that the system works great - with the exception that there is no sound - which makes plying retro games on it somewhat pointless.
As another final irony - I bought this board as a replacement for a LCIII board that I plugged into a bad monitor. The old board's video circuitry is bad. Interesting - a vga monitor (using vga adapter) makes the monitor light turn green - but no output on the screen. That board has perfect audio (POST bong after startup - no problem - and appears to work as much as I can tell minus the video).
So I've got one board (the original) without video (I think the on-board ram chips are fried). I also have my current board which did - but now does not have any sound. Any advise - please! And yes - I've done all the simple stuff like making sure the volume level isn't set to zero.
Advise... Please!
Also if anyone has an LCIII schematic... please let me know.
Best,
--Rob
I have an LCIII which was working fine but now has absolutely no audio whatsoever. No squeaks, no interferance or bad ground noises - nothing. I have tried almost everything I can think of - replacing the battery, zapping the parameter ram, checking the power supply's outputs with a DMM (5.10V, 11.84V, -4.9V) - which are close enough to be in working fine. I've removed the 68882 fpu, removed the AsanteLite pds ethernet card, removed the extra 32MB RAM chip and extra video memory chip, swapped the speaker from another (working) LCIII. I've reseated the roms - and even swapped them with the LCIII that I know for sure works - no go.
Please keep in mind that the system works great - with the exception that there is no sound - which makes plying retro games on it somewhat pointless.
As another final irony - I bought this board as a replacement for a LCIII board that I plugged into a bad monitor. The old board's video circuitry is bad. Interesting - a vga monitor (using vga adapter) makes the monitor light turn green - but no output on the screen. That board has perfect audio (POST bong after startup - no problem - and appears to work as much as I can tell minus the video).
So I've got one board (the original) without video (I think the on-board ram chips are fried). I also have my current board which did - but now does not have any sound. Any advise - please! And yes - I've done all the simple stuff like making sure the volume level isn't set to zero.
Advise... Please!
Also if anyone has an LCIII schematic... please let me know.
Best,
--Rob