I2C lcd ( arduino ) with PICBASIC, help

[iw2fvo]

Dear Steve:

Your suggested test gave me the response on the lack of operation. ( see the attached).
The pcf has P0, P5 and P6 not working. This is the reason of the trouble.
I will no longer buy components on Ebay expecially if chinese. That is very bad.
I have no words to express my state. I want to apologize .
Thanks for the help given to me since the beginning.
Will try to buy another expander board: do you know some reliable seller in Europe ?
Regards,
Ambrogio

[EarlyBird2]

Dear Steve:

Your suggested test gave me the response on the lack of operation. ( see the attached).
The pcf has P0, P5 and P6 not working. This is the reason of the trouble.
I will no longer buy components on Ebay expecially if chinese. That is very bad.
I have no words to express my state. I want to apologize .
Thanks for the help given to me since the beginning.
Will try to buy another expander board: do you know some reliable seller in Europe ?
Regards,
Ambrogio

No problem and no need to apologise. Could you do some more testing on this board?
Check the voltages on the P0 to P7 pins when this program is running.

DEFINE OSC 40 ' 10 MHz XTAL AND X 4 INTERNAL PLL 
DEFINE I2C_SLOW 1
C VAR portd.3 ' S_CLOCK 
D VAR portd.2 ' S_DATA
ADDR VAR BYTE 
ADDR = %01001110 ' dec 78 , hex 4E
CMD VAR BYTE
LCD_CMD VAR BYTE 
E VAR LCD_CMD.BIT2 
RS VAR LCD_CMD.BIT0
E=0:RS=0
LCD_CMD = 0
PAUSE 1000 

MAIN:

I2CWRITE D, C, ADDR, [%00000000] ' port off
PAUSE 200
I2CWRITE D, C, ADDR, [%11111111] ' port on
PAUSE 200

GOTO MAIN

If all pins change then the PCF8574 chip is good indicating that the fault is either bad soldering or bad PCB track. It is possible to solder jumper wire direct to pins for a temporary repair.