U2412M, defective diode and more...

My u2412 monitor is 6 years old and has been broken for 1 year. After reading this post https://www.dell.com/community/Monitors/U2412M-Repair-a-defective-diode/td-p/5048656 I replaced the famous diodes and everything worked perfect. What a joy! But it only lasted 5 minutes ... I imagine that there is something that breaks the diodes, and my knowledge of electronics does not reach more. Thanks for the help.