Hi im new here and if any one can help me. I have an aiwa LCX 70M and the display is starting to get dim. I want to diy fix it but i dont know how to start. I downloaded the manual but i cant understand the schematics. Can anyone please guide me on what to do?
Welcome to diyAudio 🙂
There can be a few reasons for dim displays. If the display is uniformly dim all over then a common cause can be dried out (high E.S.R.) capacitors that are often used to derive the specific voltages these vacuum fluorescent displays use. The displays themselves can also become low emission but that often shows as some segments as being dimmer than others. You would have to post the relevant diagrams for us to identify any possible problem caps.
Also the display and the window can attract dust and grime and that also reduces light output.
There can be a few reasons for dim displays. If the display is uniformly dim all over then a common cause can be dried out (high E.S.R.) capacitors that are often used to derive the specific voltages these vacuum fluorescent displays use. The displays themselves can also become low emission but that often shows as some segments as being dimmer than others. You would have to post the relevant diagrams for us to identify any possible problem caps.
Also the display and the window can attract dust and grime and that also reduces light output.
Hi as you can see some of the letters and numbers on my display is dimming. i want to fix it and make it look like before it became like that. can you please help me. i attached the schematic of the from display
Does the display really look like it does in your picture with thoe segments missing on the graphic equaliser? I ask because the display is multiplexed and its possible for camera artefacts to play a part.
If those segments really are missing/dim then that is not a normal fault and it could be either the display or the chip driving it. It would be a very unusual fault.
Is there any change if you apply pressure to the display driver PCB?
If those segments really are missing/dim then that is not a normal fault and it could be either the display or the chip driving it. It would be a very unusual fault.
Is there any change if you apply pressure to the display driver PCB?
Its not easy sometimes working from pictures 🙂
If we look at just these three segments as an example and if this is how they appear in reality then these have the appearance of a low emission display. That is something that can only be fixed by replacement.
If we look at just these three segments as an example and if this is how they appear in reality then these have the appearance of a low emission display. That is something that can only be fixed by replacement.
hi do you know where can i order a D4 ST GEAR for an aiwa LCX 70M my gear broke and i can't simply glue it again together for in always brake everytime i put them again together
I think your only hope is to get hold of another similar unit to use as a doner. Different models may still use the same mech but you would have to look through service manuals to check.
Not sure it would make a good kebab! donor/doner 🙂
Anyway there is a (risky) way to improve brightness of a VFD by overdriving the filaments for a period to drive off surface contamination, but it requires some knowhow and equipment, and can burn out a filament. And I am not sure its the problem here - are the darker bands under the filaments or between them?
Example video on how to do this:
- I've never done this, so I can't guarantee this will help, but it is a thing...
PS search for "rejuvenate vacuum fluorescent display", not "rejuvenate VFD" as VFD means variable frequency drive too...
Anyway there is a (risky) way to improve brightness of a VFD by overdriving the filaments for a period to drive off surface contamination, but it requires some knowhow and equipment, and can burn out a filament. And I am not sure its the problem here - are the darker bands under the filaments or between them?
Example video on how to do this:
PS search for "rejuvenate vacuum fluorescent display", not "rejuvenate VFD" as VFD means variable frequency drive too...