No trace

swed
Posts: 21
Joined: Thu Jan 19, 2017 2:36 pm

Re: No trace

Post by swed »

Done, many times.
DanilinSA
Posts: 21
Joined: Sun Jan 29, 2017 6:21 am

Re: No trace

Post by DanilinSA »

Did not help. No changes.
Sorry for bad english. I use Google translator.
abalex
Posts: 5
Joined: Thu Jan 26, 2017 8:48 pm

Re: No trace

Post by abalex »

In manual, Step 1 "Check the main board" ( switch on without Analog Board ). Be careful - power supply must be good ( Vin filter capacitor 100 uF on analog board now disconnected, so I burned my device :? ). Must be a noise on the screen. If still a line - problem in processor board. Check shorts from signal line to GND and 3.3V ... If the CPU or ( and ) 1117 is heating, or 3.3V less than 3.3V - a bad sign...
DanilinSA
Posts: 21
Joined: Sun Jan 29, 2017 6:21 am

Re: No trace

Post by DanilinSA »



CPU And 1117 not much heat.

U+: 3.24
Sorry for bad english. I use Google translator.
swed
Posts: 21
Joined: Thu Jan 19, 2017 2:36 pm

Re: No trace

Post by swed »

I can follow the signals from input all way to cpu. So it must be the logic board that i bad.
jye1
Posts: 1221
Joined: Wed Feb 20, 2013 4:58 pm

Re: No trace

Post by jye1 »

when you do VPos alignment please make sure analog board is connected and couple switch is set to GND. It won't make sense if VPos alignment is done without the analog board attached.
swed
Posts: 21
Joined: Thu Jan 19, 2017 2:36 pm

Re: No trace

Post by swed »

You should read the post first :) the shell does not respond to the ADC switch.
DanilinSA
Posts: 21
Joined: Sun Jan 29, 2017 6:21 am

Re: No trace

Post by DanilinSA »

That's right. ADC switch does not respond.
Sorry for bad english. I use Google translator.
yoab6217
Posts: 6
Joined: Sun Feb 05, 2017 11:02 pm

Re: No trace

Post by yoab6217 »

try to check resistance on the analogue bord between the 2 points in the picture (disconnected from the main bord, multimeter on 200k).

Image

supposed to be: 1k-11k-21k when you change the adc switch.
if not then check R23, R24, R25 (on the Analogue Bord).
Attachments
dso150analogue.jpg
jye1
Posts: 1221
Joined: Wed Feb 20, 2013 4:58 pm

Re: No trace

Post by jye1 »

Sorry I'm a little confused. Let's clarify.

1 ) By "ADC switch" it actually means the couple switch, right? This switch select AC, DC, or GND.
2 ) By not response did you mean you didn't see the couple display change when you move the switch? or the display changed but no effect to signal.
3 ) Did swed's board and DanilinSA's board behave the same in the issue?
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