parts list spec and installed cap not the same

[markcoenen]

I'm selecting replacement caps for a Dell model 2005fpw monitor. The main board has caps from ELNA, Samyoung & Samwha. The service manual parts list also includes board location. The parts list shows location c655 as "100UF KMG,RD 16V 20% FM2.5 T". I'm guessing that's a Samyoung KMG or a Samwha RD. Here's the odd thing—the installed cap is a Samwha RD 220uF 16v. I don't believe the monitor has ever been serviced but, not 100% sure

Could this be a production line mistake, post production revision or maybe a re-worked warranty repair, which was resold as new? AND, what should I replace it with the 100uF indicated in the parts list or the 220uF of the currently installed cap?

I wonder if this is why the monitor failed.

I've attached the service manual

[budm]

Re: parts list spec and installed cap not the same

More likely the PCB assembly version does not match your service manual.
So what is wrong with the monitor?

[srhofmann]

Re: parts list spec and installed cap not the same

The only way to tell for sure what it should be is to compare it to another "virgin" monitor. The service manual doesn't have any revision number and it also doesn't spec what serial numbers are covered.

From the schematic it looks like it's just a filter cap on the output of the 3.3V regulator. Shouldn't really make a lot of difference, but I'd probably go with the 220uf. You could always put a scope on the output and try both values.