HP w20 LCD Display Inverter, running out of options.

[CapBlown]

Having issue with HP w20, 20" LCD, Manufactured 2006.

Display works perfecly about 15 minutes then it suddenly brightens a bit and immediately after this backlights are turned off. When monitor has been operated to this point, and I restart the monitor it opens up, immediately brightens a bit, and backlights are turned off again. Letting it cool down for half an hour and I get another 15 minutes before baclights go off.

Problem must be on inventer board as image is still there. So I visually inspected all capacitors, they seem to be allright, could it still be a capacitor issue? Or could it be a dry joint?

I resoldered almost everything on inverter board, especially transformers as I found out looking other threads that my problem is close to 'two seconds to black' -symptom. Now tested with backpanel off and monitor operated nicely about 4 hours, then backlights turned off again.

Is this a heat issue? Those four 1000 uF and two 1500 uF caps are very hot. As ventilation was now so good, I tried to cool them down with cold spray. It did not help at all. So I froze all other components with it too... problem remains.

I took another approach... after monitor cooled down, i took a blowdryer and heated up the components on inverter board for minutes. Then I turned the monitor on expecting it to shut down immediately. But it worked for half an hour now before backlights went off.

Obviously the problem is with inverter but I don't know what parts should I take for closer inspection. Maybe I'm going to resolder transformers again?

Any other suggestions will be appreciated. I'm confused.