Weak signal strength in all Sims

[rajeshnayak789]

Signal strength is 0 inside home and at some places i get decent network. I have yuphoria itz working well in home. I think its a hardware issue. Any workaround to fix it without going to service center? I hve searched a lot about it but didn't get any help.  just tell me if its a minor issue or my motherboard is gone?