Hi Rifatshihab11,
Welcome to Sony Community!
In this case, you need to send the unit to a repair center. The model SVE14A25CNW. is a non-US model thus we suggest that you contact the Sony offices/Sony representative offices nearest to your place of residence in Asia Pacific region http://www.sony-asia.com/countryselector.html?hpid=countryselector:AsiaPacific. Due to proximity, they are in a better position to respond to your questions or concerns.
Regards,
Jen
Answered your question? Glad I could help! Please Click the "Accept as Solution" button below.