Just fixed one of mine....for the second time and I'll share some symptoms.
First time.
Would run for a while and then PSU would shut down and reboot. Rinse and repeat.
Had it apart and replaced the SMPS controller PSU cap (low value) and all the 5V rail PSU secondary caps.(low values)
Tested all other PSU caps....seemed OK. NO signs of bulging or leakage.
Problems still.
Second time.(it's some weeks since I've had a chance to get back to it)
Same symptoms as before but the runtime before rebooting was longer.
Replaced all PSU secondary side caps including 2x 680uF bulk caps close to the backlight inverter.
All values tested very slightly low ~5%.
!000uF is what I had...they'll do.
Of course one should check ESR's to find the culprits but I couldn't be bothered for a few bucks worth of caps.
Runtime as I type ~30 minutes.
Time to put the covers on and return it to service.
Edit
I should mention that only PSU and backlight inverter caps were replaced.