Sir Mauricio Calgaro . . . . .
With that unit staying on long enough for you to be able to get that display panels error display I believe that your problem is being in a completely different area.
I am placing both the component and foil side "snippets" below of the concerned board of interest.
This will just be a NO POWER APPLIED test . . . with you just using a DVM in its ohms function mode, lowest range.
SET up and initially note the instruments display produced for a no connection / open circuit condition by its display shown when the meter probes are being unconnected.
Then short the probes together and note that display read out . . . . . that will be our type of reading of interest.
Now whichever board side is the easiest to get your probes to, note the two RED circles that are on the extreme outer ends of a transistors possible 3 connections..
Work across those like 2 connections on each of the 14 side by side power transistors across the board.
You are looking for any shorted ones.
Standing by . . . .
CIRCUIT BOARD REFERENCING POWER TRANSISTOR LOCATIONS . . . . .
73's de Edd