Please check that there is no short circuit to ground on the soldering points of: R27, R9 or R10.
Resistance found:
- IC3-PIN12 ==> IC2-PIN1 =23.8
- IC3-PIN12 ==> IC2-PIN2 =3.7
No short circuit between ground and R27, R9, R10
Please check that IC3 pin 12 is not short circuited to ground.
The resistance between this pin and ground should be 26 k ohm.
well as I am really new in electronics things I am suddenly not sure to understand/know how to check short circuit (so may be I did a bad answer before).
When I measure resistance with GND-SK2, I found:
IC3-PIN12 = 0
R9 = 0.96
R10 = 0
R27=1.84
OK.
Indeed, there seems to be a short circuit (solder bridge) between the trace connected to pin 12 of IC3.
The short is either on the solder point of R10 or IC3 pin 12.
It works!
A soldered point of R10 was faulty, I just resoldered it and thatâs all!
May be to be added to the check list when a user does not succeed to advanced calibration or to measure: check input cables! Mine was broken/cut (red input cable) at the plug level. I just had to cut it and to reconnect it to the plug!
In all cases a very big thanks to you for your valuable help.
Best regards
[quote]It works![/quote]This is good news 
[quote]May be to be added to the check list when a user does not succeed to advanced calibration or to measure: check input cables! Mine was broken/cut (red input cable) at the plug level. I just had to cut it and to reconnect it to the plug! [/quote]Iâm sorry for the inconvenience. Indeed, it is good that this problem is now located and solved too.
Thank you for the feedback.
Hello, I assembled my Edu08 a few days ago. But it didnât work ⌠thanks to these topics, I found 2 problems:
- too much flux on the boards, it really was a problem
- surprisingly, I also had a broken red cable
For everyone who doesnât manage to get the screen working properly: remove all flux with isopropyl alcohol.
For everyone who doesnât manage to calibrate and measure something: check the cables even if they are new.
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