InFocus LP600 Power Board Questions - diyAudio
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Old 6th May 2008, 06:57 AM   #1
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Default InFocus LP600 Power Board Questions

It appears that the power board on my LP600 is toast. Nothing appears "burnt" but there are no lights or LCD when it is powered up. The fuse on the board is OK and I'm scratching my head trying to figure out next speps. The board assembly number is 510-1842-16. Every search engine I'[ve tried gets me right back to this forum which does not appear to have a LP600 thread. Any advise from anyone will be much appreciated.
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Old 11th May 2008, 02:41 PM   #2
ywh is offline ywh
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Hi !
show some pic of your power board please
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Give up the UHP and HQI lamp now! Take a look at our LED projector!!http://www.diyaudio.com/forums/diy-p...e-theater.html
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Old 24th June 2008, 01:57 PM   #3
nemo81 is offline nemo81  Norway
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Hi, i have the exact same power here. I will supply some pics soon, just gotta get a hold of a camera.

I did some measurements, but im not sure what to expect where (i only got the power board, not the rest as im trying to fix this for a friend)

Im getting around 2V on the lamp connector and 5ish V on the square connector on the underside of the board. Mate says it doesnt work tho, he tried changing bulb etc and reconned that the power was bad.
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Old 24th June 2008, 01:57 PM   #4
nemo81 is offline nemo81  Norway
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Was not able to edit last post (possibly due to me being a new member) so here is the pictures i promised.

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Hope this is what you were looking for!
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Old 26th June 2008, 02:00 PM   #5
nemo81 is offline nemo81  Norway
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Im getting the rest of the projector this weekend. Turns out my mate has two identical projectors with the same fault (dead).

Anyone got any experience with these power boards, or schematics for em?

Anything would help really.

Thanks!
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Old 18th July 2008, 07:43 AM   #6
Pex1 is offline Pex1  Finland
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Hi!

My first post on this forum.

Seems that I also have same symptoms on InFocus LP600 projector, it is dead.
No LED light, no LCD text or light, no picture, just nothing.
I dismantled and checked fuse, but fuse seems to be OK.
I couldn't find any burn marks on power board or other boards.
So now I'm little bit on dead end.

Have anyone some information about this power boad and specially what voltages should be at the pin grid on working board?
Or could somebody measure voltages from working power board?

Help really appreciated.
Thanks

Pexi
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Old 31st July 2008, 09:36 PM   #7
DaGimp is offline DaGimp  United States
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on the mains section of the power supply board you have 4 100uF/16v and 1 4,7uF/35V electrolyt condenser of a 85 degree type. that means it will work 2000 hours at 85 degree (celsius). since the power supply only switch off the lamp in standby with no fan the power supply get hot- i think about 70 degree. so after two years in stanby it is evident that this condensers loose halve of their capacity - after switch off no new start. changing this condensers with new ones of 105 degree type will solve tis problem. and for the future - no more stanby.
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Old 4th August 2008, 07:48 PM   #8
Shorin is offline Shorin  United States
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Before trying DaGimp's answer, I would do this first...

I just finished a relamping on a projector and it was dead when I took the bulb cover and bulb out. That is, until I put the bulb cover back on. There was a big safety switch that was pressed when the bulb cover is screwed on tight. That was preventing anything from happening and it was puzzling until i started poking around through various holes on the outside.

So that aside, all you people with only a mainboard or power board - this is typically a no-go. Often the PS is controlled by the mainboard, which is controlled by those buttons on the outside. You won't get far without the projector controls. The controls for mine are attached via a ribbon cable to the keypad fixed to the case cover. This would not apply if the buttons were ON the mainboard.

Okay - so try those simple things first... then see if those condesors (capacitors?) are bad.

By the way, DaGimp, do you know how you would actually TEST those components? (without some expensive scope)
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Old 20th August 2008, 07:01 PM   #9
Pex1 is offline Pex1  Finland
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Hi!

I managed to buy old working power board quite cheap and made few measeures on that one.
DaGimp were right. I needed to replace only 3 of those 85 C condensers and now power board works nicely. I finally replaced all 5 of them to be certain that it will work longer...
Thanks goes to Shorin and specially DaGimp for right answer.


cheers Pexi
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Old 14th September 2008, 04:07 PM   #10
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Can anyone tell me what capacitors they are talking about on the power supply are they circular like capacitors I am familiar with, or are they rectangular in the pics the previous user sent
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