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[Pro2 PLUS] Mega 2560 problem
#21
Despite the value shown on the schematic, all Pro2 PLUS boards were and are supplied with an 4 Ohms resistor at R1. Value is not very critical, it could be 4.3 Ohms, but not too high, or it will heat significantly and TFT brightness will lower.
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#22
Hello

I just start troubleshooting and I guess you can advice.
1. the LCD is blank …
and when I try the Flashmemory_test it's looking blank !

Maybe something I missed …
Undecided


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#23
I think you mean the TFT display is blank...

Before installing the Meduino 2650 board on Pro2 PLUS board, do you have removed the diode illustrated on the image bellow?

[Image: mega_mini_usbmod.jpg]

This procedure is very important and referred in several places on the forum and also on the WeatherDuino Wiki.

If the diodo wasn't removed, always disconnect the USB cable before disconnecting the board mains power supply, otherwise board damage will occur.

Things to check:
- Check voltage at the 3.3V rail
- Does the 3.3V voltage regulator appear to be very hot?
- Disconnect all the wires to the TFT display and run the Flasmemory test again. Are you getting the same results?

Rgs
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