Panasonic — Motherboard problem in plasma tv model no th-p42xt50d

Address:

500035

I have purchased above mentioned plasma tv on 27.10.2012.
First repair no power supply attended on 21.11.15
Second repair no power supply attended on 25.2.16
Now again there is no power supply to tv i have lodged complaint.
Complaint nor[protected] same service center person came and taken tv to their work shop. After few hours i have been informed about mother board problem. Charges for new mother board around 18k+service charges.
I have additional stabilizer and three phase current no chance of directly effecting motherboard.
Pl let me know is there any chance of repairing the mother board. Or discount in cost of mother board.
I have attached copys of invoice and previous complaints resolved copys.
Now sree techno services / hyderabad attached for servicing.
My mailing id is [protected]@ubmail.com