Virus b problems - OS won't boot, LCD glitches, LFO led's light up - common problem - The Unofficial Access Virus & Virus TI Forum

audioman · #1 20.07.2011, 11:32 AM

Problem Solved !!!
After contacting official repair center and ask in vane for the service manual i have changed all the electrolytics (schematics attached) and all the 3 voltage regulator.
all is working perfect now
If you have the same problem do the job and you solved !!
Thank you all
Fabio

omnesilere · #2 23.07.2011, 02:58 PM

i was just setting up a session when i looked over and my virus b just started acting weird. i did a restart and it acts similar.. i let it rest for a while and it'll get to this knob turn test which it responds to if you do it manually only it starts over and over.. if it doesnt work after being off and unplugged for a while i guess changing the capacitors and voltage regulator is the next step. this is the only thing i found online that is relevent.

elior77 · #3 08.11.2011, 12:07 PM

Hey !

I had the same problem with endless reset - now it is SOLVED !

caps and new psu

Now all ok !

timotije2000 · #4 11.12.2011, 05:48 AM

I got a Virus Rack B and a month ago the LCD started flickering and dimming. I opened the unit by unscrewing the bottom lid. Then switched the power on and touched the white LCD ribbon cable a few times, and guess what? The LCD started flickering every time I touched the cable. It wasn't the solder joints but it was due to ACCESS bending the hell out of the cable, almost 360 degrees

. So to fix the issue I unbent the cable by counter-creasing it and then I twisted it in a circle so that the bends are very obtuse. Closed the unit up and now it runs very bright. I hope this helps many who are having the same problem.

vonnor · #5 24.05.2014, 05:54 PM

Quote:

Originally Posted by timotije2000

I got a Virus Rack B and a month ago the LCD started flickering and dimming. I opened the unit by unscrewing the bottom lid. Then switched the power on and touched the white LCD ribbon cable a few times, and guess what? The LCD started flickering every time I touched the cable. It wasn't the solder joints but it was due to ACCESS bending the hell out of the cable, almost 360 degrees

. So to fix the issue I unbent the cable by counter-creasing it and then I twisted it in a circle so that the bends are very obtuse. Closed the unit up and now it runs very bright. I hope this helps many who are having the same problem.

Thanks Z. This is exactly what my Rack was doing, and exactly the fix for it.

~ vonnor

microluv · #6 24.01.2015, 12:59 AM

So mine receives midi and sends. It turns on but doesn't boot the OS. You can do reboots of the system but no sound comes out any of the audio outputs. I can send the most recent OS but once it asks you to store it. DSP-RAM error.
I replaced the one capacitor pointed out and it didn't fix it. I took down any oxidization that may have accumulated on the socketed chips(which I believe are the ram chips?)
Nothing looks unusual inside.
The LCD doesn't blink when it's turned on. It will often show black bars. All leds seem to still function and controls? unless you do factory restore in which it will show all sorts of internal saved information and let you go through all the menus...
Does anyone know:
Can I send the OS upgrade from a virus a?

Help!!

DJ:HAUNEBU · #7 13.10.2012, 02:48 PM

HI, i wasn't so lucky... mine boots up now but soundbank A and B is history and it freezes after 20 sec. do you have the servicemanual as a PDF? If you do would you be so kind and sen it to my mail djhaunebu@gmail.com it was such a blow when it froze.

W.C. Fields · #8 13.01.2013, 08:28 PM

I have a dead Virus Indigo (B with a keyboard)

I too would be really interested in a service manual.

I took it to Advanced and they quoted the same, costs more to repair than the thing is worth.

email: brock.fansler@gmail.com

ianob · #9 13.07.2015, 01:49 PM

Confirmed, seems this is a common(ish) fault with the virus b - the capacitors go bad. Symptoms are part boot/ no boot, screen flickers green, LFO leds light up but nothing else. Don't despair, replacing the capacitors fixes the problem! There's a schematic in this thread, so if you take note of the cap values you can source them and replace without the need for a service manual. There's another approach - If you're like me and have no clue how to do that, there's a guy on ebay who sells a replacement kit that's not just a fix, but actually offers super audio quality to the existing design. It's really not that hard to do - my virus was a brick in the cupboard for three years but now it's actually better than it was brand new! Not an electronics wiz, but if I can do it....

djinfinitee · #10 06.02.2019, 05:40 PM

Quote:

Originally Posted by audioman

Problem Solved !!!
After contacting official repair center and ask in vane for the service manual i have changed all the electrolytics (schematics attached) and all the 3 voltage regulator.
all is working perfect now
If you have the same problem do the job and you solved !!
Thank you all
Fabio

Hey Fabio,
I had same exact problem but as OP and after a while of it just sitting it no longer boots at all. Dim screen with no characters and just the LFO 1 and 2 lights come on solid. I opened it up and replaced two 2w 1 ohm 10% tolerance resistor that had some charring on their bodies with a 2w 1 ohm 5% resistor (all I could find) and its still same thing. Dim screen, just thw two LESs. None of my other capacitors or resistors look bad but it sounds like I'd need to replace them as well. Question is, on your diagram, which caps did you replace? All of them or just some? Any clarification is appreciated. So bummed that this thing is bricked after
15 years of just sitting on my desk and working without fail in my studio.