I replaced the fuse with two glass fuses in parallel (they 're 250V 2A each) and did the test with the light bulb (60W incandescent).
The bulb was fully lighted, the tv didn't power up.
So, I suppose, the short circuit remains (??).
I measured voltage at pin 1 of I801, it was 25V and was not steady, it was dropping, 24, 23, 22, 21...
I don't know what this measurement means, as I have the light bulb in series with the tv.