You want check condition of your galaxy y duos or other android phones

  some secreate codes that shows the information about your in good condition are not?

Then dial the secret code *#0*#. Now you get a screen with title LCD TEST and below that you have lots of option to test various hardware parts of your phone such as speaker, sensor, lcd, etc
To go back use right physical button 
while testing the touch you have to touch and mark all the squares back button does not work 
Other use full secret codes for android phone tested on galaxy y

  * * #1234# to check software version of phone.
  * *#12580*369# to check software and hardware information.
  * *#0228# Battery status (ADC, RSSI reading)
  * *#32489# Service mode
  * *#7780# factory data reset galaxy y
  * *2767*3855# Full factory reset (Don't dial it does not ask you to confirm unless you have problem)*