problem with channel 2 and channel 9

[micheleboato]

i have 2 channel that does not working (channel 2 and channel 9). I have the kit CTB16D Blue

 

- triac and moc working fine

 

i tried to:
- connect incandescent light
- connect other led light
- reset board
- add a c7 for a trick

without success

 

i have always 0 volt on channel 2 and channel 9. I changed the moc but the problem remains
I saw that there are always 0 volt from pin 6 U10 and neutral in this 2 channels. In the other channels i have the tension when the channel is on
I also review the solders...and read all troubleshooting file
I need other help for check the board with the tester (multimeter)

 

i saw that on the u4 i have 0 volt on the pin 12. The pin 12 maybe is the out for the channel 2. I checked on other pin and i have 5v when the channel is on?
Maybe is the firmware problem? Or the u4 does not working fine?

 

Have you any idea?

 

[micheleboato]

Hi,

i have again the problem with channel 2 and 9.

I saw that on the u4 i have 0 volt on the pin 12. The pin 12 maybe is the out for the channel 2. I checked on other pin and i have 5v when the channel is on?
Maybe is the firmware problem? Or the u4 does not working fine?

 

i checked and reflow the solder on the 28 pin processor chip

 

do you have other suggest that i can test with multimeter?