Dead NEC NP305 & NP310's after power problems

[azc]

Hi all,

 

We had some problems with power on Friday and come Monday morning we start getting calls that projectors won't work.

 

We were able to bring most of them back to life by pulling the power cord, counting to 30, and reinserting.

 

However, we have a number of NEC NP305 and NP310 projectors that are completely dead. Only these two models seem to be affected.

 

Having a peek inside I can see what looks like a fuse soldered to a power board. Edit: Have checked the fuse with a multimeter, it's good.

 

Anyone have a service manual for these projectors, or any advice for me?

 

Thanks.

Edited November 11, 2014 by azc

[IT_Ninja]

Hi, as with many electronic devices that go dead it is likely a power related issue.

 

Look at the power supply for any indications of a fault. Not sure how versed you are with electronics but most common is the bulging capacitor problem - (if it has a fat/ protruding head it needs replacing, and likely those around it).

 

The fact that they have to be drained of power suggests a capacitor related issue.

 

Of course be careful handling electronics as they can be quite shocking

[azc]

Hey Ninja,

 

Thanks for your reply. The projector I took apart and prodded with a multimeter started working once I put it back together. Couple this with what you said about having to be drained and it led me to the solution.

 

We simply weren't holding the power button down long enough to drain the capacitors of whatever leftover juice they had in them.

 

I've now repaired 3 dead projectors by holding the power button for a minute with the power cable removed. The rest I'm waiting for class change time and by the end of the day they should all be working.

 

Thanks again.

[IT_Ninja]

Glad to hear that! Unfortunately sometimes it happens, I experience power related issues with relatively new equipment (and old) going dead, before jumping to dissecting them it is always best to try to drain the power and retry. 9/10 times it works

 

There are a few causes of this but they run fast and hard which tends to contribute.

 

I'd give the projector and fans a good cleaning or some form of maintenance before putting them back into commission, preventative measures etc etc. Hope it helps.

[azc]

Preventative maintenance? What's that?

 

With 98 projectors on campus we never get time to clean them, except when we change a lamp we'll give the filters a blow-out then.

[IT_Ninja]

haha ... I mean with it in hand give it a good cleaning but 98, well if it aint broke don't fix it

 

- - - Updated - - -

 

Preventative maintenance? What's that?

 

With 98 projectors on campus we never get time to clean them, except when we change a lamp we'll give the filters a blow-out then.

 

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