Electronics > Repair
TDS3012B blank screen
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pcarew:
Hello AlcidePiR2,
I realize that it has been a couple of years, but did you make any further progress with you Tek scope?

I have a TDS3054B with *exactly* the same symptoms as yours. I have checked the power supply voltages etc and I also don't have a square wave test signal.

This scope was working, but hasn't been powered on for 3-4 years. When I went to use it again, it was dead (with the exception of the fan and screen backlight)
Best
Paul.
pcarew:

Hello AlcidePiR2,
I've progressed the diagnosis of my dead TDS3000 to where I think it might be the processor (either dead or broken BGA connection).
I have started a new thread dealing with that:

https://www.eevblog.com/forum/repair/dead-tds3000b-(3054b)-possibly-processor/
pcarew:
Well I know it has been nearly 2 years since I last posted on this thread, but I *finally* got around to removing/replacing the Motorola Processor BGA.
I replaced the chip with a new one purchased from Motorola/NXP

And.....drum roll.... **No Change** :-( :-(

Same symptoms, blank screen with white back light and fan running, no other activity

So after all this time, I think that was a 'red herring'

Hmmmm....

So, back to the drawing board so to speak
meduza:
Check the bus, maybe there's somewhere a short between address/data pins. I recommend you inspect pins of memory chips with a microscope, check adjacent pins for shorts, and check the bus activity on all address and data pins.
coromonadalix:
was there a 25Mhz  oscillator diying  who could block the boot process ??
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