SHARP LC-40LE810UN has issue help needed to find and fix.

Hi everyone,

My sharp - LC-40LE810UN works excellent till last year , than problem starts

it still works excellent till it decide to drive me crazy. middle of normal viewing

it suddenly shut off and , power light blinks - 1 long (slow) + 1 short(FAST)

it start to happend from last year , 

i power restart tv with service screen - K - i found lamp error 5 , i reset , i also did factory init , and few other param to reset , all goes well and work till last week, the same problem jump back , i can reset again same way but i am looking to find solution if there is any physical damage , like LED / bad CAP / its power board ? 

when issue happend first time year ago , i open back panel , expect to see some swellon / busted cap etc but didn't saw anything , just vaccume lint and close.

- 1 long + 1 short blinking code makes some confusion , some place it says few LED on strip , or power board ,

- also i notice the front power LED is glow quite weak , not bright enough while normal operation. 

can any expert help and share on this issue . help appriciated , thanks in advance.