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In the Sony TV a dark display is generally a bad picture tube. I have seen many of these and thought I could correct it with a deflection repair. I would next put the main board in another TV and saw that the board was just fine.The TV had a good picture.You can bet you have a picture tube that is bad!
Know to solders?Resolder ur video board socket holes that connected to( CRT tv Tube).Resolders the Yoke cable red, green,yellow connected to the main board also.Should get colors back,if the colors IC on the video in not dead,and capacitors help the IC on the video board.
sony blinking lites are error codes, on an LCD proj set 3 means bad lamp, 4 a bad fan 9 a bad thermal fuse, on a direct view like yours its probably 4 or 5 blinks indicating a bad D board (sells around $250) .
or a bad video IC, so B4 you buy a D board you need to check the CRT board if it has one IC on it measure ohms across the B+ capacitors on the CRT board, if shorted the IC is shorted and also the supply resistor will be open on the D board, if its shorted the CRT may be NG.
If the CRT board has three ICs don't bother checking eem just get the D board.