Hi everyone.
Sorry if im not posting my problem in the right place also about my poor english.
Im trying to repair an ESR tester based on atmega 328, i ve got it from ebay, it comes as a DIY kit. the device has worked succesfully after soldering all it components together.but after a stupid mistake from me (over voltage or backward power plug i dont remember) it stopped working now ,when i push the ON button it wont turn on, i can see the screen lighting up for a half second and after that it stops completely.
i suspected these components atmega328, HT 7550,TL431,and maybe also the s9012 and s9014 but im not electronician skilled i ve already checked all the connections of the board they are OK.
so i need a support from the masters here in order to help me repairing it i ve uploader a picture , and a shematic of the device .thanks in advance.