diff --git a/README.md b/README.md
index 9cea9a3..e43eebb 100644
--- a/README.md
+++ b/README.md
@@ -369,6 +369,33 @@ Generic :
 
 There is a nice websocket debug tool : websocat.
 
+
+# 
+# Troubleshooting
+#
+
+Try these steps in this order ;
+
+- Use talk3 in ethertools directory : this ensure your computer can connect to the etherdream. See ethertools chapter in this readme. If talk3 doesn't works, check the hardware, connections,...
+
+python3 talk3.py -i etherdreamIP 
+
+- You should see "connected to yourLJserverIP" on webUI. If not : LJ is not started / reload webpage / your network configuration is bad / a wrong IP in the configure parameters : python3 configure.py.
+
+- Switch to simu page. If you don't see anything : check redis server or your points in redis doesn't respect pointlist formatting (see command reference).
+
+- If talk3 works but you don't see your points : click on the Grid icon in Align page. This will override your pointlist and display squares. If Grid works : recomputed points by tracers are "bad" with given values in LJ.conf.
+
+"Bad points" ?
+
+- too small movement : some lasers (with small angle like 40°) won't display anything if zoomx/zoomy are too small. Increase zoomx / zoomy in LJ.conf. Try 50-100 values.
+- off center : check in LJ.conf centerX and centerY. Reset them to 0.
+- not enough points.
+
+*Don't kill your scanners : becareful with kpps setting.*
+
+
+
 # 
 # LJ commands reference
 #