HP monitor power light turns on and off

N

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
NewbieRepair said:
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?
Click to expand...

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...
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