Doddanagamangala is the start of the trip, not the workshop. The workshop is SAI Laptop Service in Ganesh Complex, Electronic City. The lid is opened there.
Dark, with the fan still going
A picture that stays black while the fan turns can be the panel, a cable, or the board. They test which, and only then talk about glass. A crack you can see is a different clue from a dim image. Batteries, keyboards, slow drives, heat, and malware remain available when the display is innocent.
You skip a panel the test did not ask for
That saved part is the benefit. The quote follows the test, and paid work follows the quote.
Use 099724 47766 and say whether the fan still spins. The services page, the Doddanagamangala repair page, and the main service page are this workshop.