HP monitor power light turns on and off

NewbieRepair

New Member
Hi everyone,

This is my first post here and I'm new to electronics repair.

I have an HP LA2006x monitor that's giving me some trouble. The display doesn't come on at all. When I power it up, the power light turns on for a second or two, then goes off, and this cycle keeps repeating.

I couldn't find any obvious signs of failure - no burn marks. Capacitors seem fine (none are bulging). I tried different cables, outlets etc... Issue is still the same.

I'm not sure what to try next. Any advice would be greatly appreciated!
 
Solution
Alright, I'll check all the capacitors. I've already tested a few and they were fine. Desoldering them and checking their capacitance should be enough, right?

No, completely pointless, it's the ESR which goes high - you need an ESR meter to test them (as augustinetez mentioned).

It's extremely common that their capacitance is still fine (and within spec.), but the ESR is what matters - I've tested (and replaced) thousands of such failed capacitors. Basically it's down to cheap low quality capacitors, if decent quality ones were fitted, then they DON'T fail - if cheap crap ones were fitted (like Samsung have tended to use) then they fail pretty rapidly.

However, assuming it's the PSU which is at fault, it could be...
Cookies are required to use this site. You must accept them to continue using the site. Learn more…