I'm trying to repair the logic board of an LCD monitor that died while giving off a burned smell.

It seems that an LCD driver chip and a MOSFET (I think) burned out. The chip was easy to identify (HV9982) and order, but I can't unambiguously identify and find a replacement for the other part.

It is labeled "540N 88KFG" and I think its form factor is TO-252 / DPAK. Below is a photo, there are three of them in the middle of the picture.

A related question is what characteristics I have to make sure to match if I can't buy an exact replacement. Searching around for "540N" MOSFET, I found some in other packages whose main data points were

  • 100V source-drain voltage
  • 33A current rating.

If those do indeed apply to this component as well, what else needs to match in a replacement?

Update: After looking around a bit longer it appears that IRFR3410PbF might be a reasonable replacement.


  • \$\begingroup\$ looks like some smps there, I would say gate capacitance and rdson would play a role too \$\endgroup\$ – PlasmaHH Apr 22 '15 at 22:06
  • \$\begingroup\$ Smells like a IRF540, but "N" usually means some sort of TO-220. \$\endgroup\$ – Ignacio Vazquez-Abrams Apr 22 '15 at 22:52
  • 2
    \$\begingroup\$ THIS IS NOT A REPAIR QUESTION, IT IS PART IDENTIFICATION FFS \$\endgroup\$ – Passerby Apr 22 '15 at 23:52
  • \$\begingroup\$ @Passerby, the very first words of the title I chose are "Identify/substitute", and the tags I applied are "identification" and "substitution". Can you elaborate on what else you'd like to see? \$\endgroup\$ – Marc Liyanage Apr 23 '15 at 0:00
  • 2
    \$\begingroup\$ @IgnacioVazquez-Abrams Chinese often put part numbers that are familiar into different packages than the original- eg. 1N5819 in MELF rather than DO-41, MJE13003 in TO-92 rather than TO-225 etc. \$\endgroup\$ – Spehro Pefhany Oct 10 '15 at 4:03

Might be a Ceu540n, or similar 'clone' of the IRF540.

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.