ltimeter to check the resistance of the caps and they behaved all normal (rising resistance to mega Ohms).
doesnt mean anything, you need esr meter, or just swap all the caps blind
into two groups. If I measure the resistance between any of this four contact points I get a resistance of 0 Ohm (or very, very low). Is this normal?
depends on what you measured and how shit your meter is ;-)
primary is usually very low <1ohm, but secondary should be in xxx-xxxx ohm range
my pretty crap UNI-T 70a barely registers 0.1 ohm difference between measuring shorted leads and random primary
what can be bad
-power supply
-transformer. we know its not totally shorted - monitor turns on for a second, might be partially shorted
-mosfets, probably on the bottom of this pcb, again turn on means they still work, but could have bad RDSon due to prolonged overheating maybe?(guessing)
-one of the lamps - when you get monitor to turn on does the backlight look all white or are there any pink/dark spots?
turning off after few seconds is usually due to either lack of power from the supply or overcurrent protection in the inverter controller(again on the bottom side)