Arduino mega with Ethernet shield and LCD keypad

Using Arduino Project Guidance
1

Hello,
I have some trouble with an Arduino Mega using the ethernet shield with an lcd keypad shield.

When only the lcd is plugged, all is working. But if i plug the ethernet shield, it doesn't work anymore.
I have override the pins used by the LCD to avoid conflicts with the ethernet shield (use the library at GitHub - dniklaus/arduino-display-lcdkeypad: Arduino LCD Keypad Shield driver. ) :

_lcdkeypad = new LcdKeypad(
    LcdKeypad::MCPT_MCP23017, // MCPType mcptype
    0x20, // uint8_t i2cAddr
    1, // uint8_t detectDevice
    0, // uint8_t backlightInverted
    35, // LcdKeypad::s_defaultLcdRSPin
    37, // LcdKeypad::s_defaultLcdEnPin
    27, // LcdKeypad::s_defaultLcdD4Pin
    29, // LcdKeypad::s_defaultLcdD5Pin
    31, // LcdKeypad::s_defaultLcdD6Pin
    33, // LcdKeypad::s_defaultLcdD7Pin
    39, // LcdKeypad::s_defaultLcdBackLightCtrlPin
    false // LcdKeypad::s_defaultIsLcdBackLightOn
  );

Even with that, it doesn't work. I don't see any conflicting pin. If i unplug the icsp connector, the lcd works like a charm.

Any idea?

2

power issue?

3

Sorry for the late response.
A collegue suggest me the same thing, i try with a phone charger, but the pb is still here.