Help repairing Infocus LP530

[Wombatten]

Hi! ok I have been asked to start a new thread (in the Help with InFocus LP340 thread)so sorry for posting this again

I got a lamp from ywh it worked great the first day i testet it (bright and with good colours).But sadly the next day the projector broke down just after 30 minutes.After checking the powerboard the first thing i noticed was that the resistor R577 is burned (and open) and the condensator C518 is shorted.After some reading in this great forum I guess that the viper100a and one or two photocouplers SFH617A-2 is gone too and C13
(el.condensator 100mikroF. 25V).And the 3 pinned component on the left of C518 marked ?508 (i can´t read the first letter ).
I guess schematics for this powerboard is impossible to find.If i gonna try to repair this i need to know the values of the following:

R577 ??? ohms (can´t read the numbers because its burnt think it begins with a 5 and ends with a 0)
C518 ?? (got no markings)
?508 don´t know what this is transistor or diod ?? (it´s marked n5 JE)

Projector: Infocus LP530
Ballast: MagneTek Model: 3A49-03-100 (Output:75VDC @ 3.6A)Original lamp is: 270w SHP now lamp is 270w JYS/DC from ywh

Can you mbates14 or anybody here help me with this, or where i can find a new powerboard?
Any help would be great! Thanks a lot!

[mbates14]

i hate to burst ywh bubble, but his lamps just arnt compatible with these power supplies.


i dont know, and i dont care how many good successes there have been with 500s, and 530s, but ive got more 500 power supplies on my work bench that i have to repair, then you will EVER see, that tried his lamps. lol....


the LP530 supplies just dont have enough ignition voltage to fire them off, and will eventually cause the push-pull controller to fail...

the LP500s will cause an over-current condition and cause them to fail, such as in your case..

my next post will be how to fix the failed supplies.


to PREVENT this mess with ywh lamps for the most part:

there is a power level adjustment screw on the board. it needs to be turned up about an 8th of a turn. that should do it.

[Lex-LP350]

Hi mbates14, I read your post about how to repair Viper100A failure on LP340B / LP350 porwer supply, I repair a couple of power supplyes following your guidelines but now one of them fail again, then searching for information I read that a new lamp is not compatible with this type of power supply because need some rework...

Then if I install a replacement lamp for an infocus LP350, I think the old lam/bulb is a LP-LAMP-LP3E, but according to www.infocus.com a replacement for the old LP-LAMP-LP3E
will be the LP-LAMP-LP3F but a rebuild of the projector is required
(power supply) to fit the new LP-LAMP-LP3F

Does anyone know why the projector has to be rebuild ?
(as far as I can see the new bulb is the same as the old, they are both labeled SHP6 on the bulb, but lamp module is labeled 505-0631-02 on the old module and 505-0631-05 on the new module.

Obviously a rebuild is need to prevent the Viper100A failure, I think, do any of you know how the rebuild is done ? or how to prevent the Viper100A to fail again ?

Thanks.

[Lex-LP350]

Hi again mbates14, just received other LP350 for repair but it have a totally different failure: the resistors R530 and R532 are totally blown, also other parts like R538...

You know about this failure ? Can you provide me please guidelines to repair this power supply ?

Thanks again.

[mbates14]

Originally posted by Lex-LP350
Hi mbates14, I read your post about how to repair Viper100A failure on LP340B / LP350 porwer supply, I repair a couple of power supplyes following your guidelines but now one of them fail again, then searching for information I read that a new lamp is not compatible with this type of power supply because need some rework...

Then if I install a replacement lamp for an infocus LP350, I think the old lam/bulb is a LP-LAMP-LP3E, but according to www.infocus.com a replacement for the old LP-LAMP-LP3E
will be the LP-LAMP-LP3F but a rebuild of the projector is required
(power supply) to fit the new LP-LAMP-LP3F

Does anyone know why the projector has to be rebuild ?
(as far as I can see the new bulb is the same as the old, they are both labeled SHP6 on the bulb, but lamp module is labeled 505-0631-02 on the old module and 505-0631-05 on the new module.

Obviously a rebuild is need to prevent the Viper100A failure, I think, do any of you know how the rebuild is done ? or how to prevent the Viper100A to fail again ?

Thanks.

no.. the rebuild is required to stop the boost converter from frying its windings and MOSFET, becuase of the different required current draws.

[mbates14]

Originally posted by Lex-LP350
Hi mbates14, I read your post about how to repair Viper100A failure on LP340B / LP350 porwer supply, I repair a couple of power supplyes following your guidelines but now one of them fail again, then searching for information I read that a new lamp is not compatible with this type of power supply because need some rework...

Then if I install a replacement lamp for an infocus LP350, I think the old lam/bulb is a LP-LAMP-LP3E, but according to www.infocus.com a replacement for the old LP-LAMP-LP3E
will be the LP-LAMP-LP3F but a rebuild of the projector is required
(power supply) to fit the new LP-LAMP-LP3F

Does anyone know why the projector has to be rebuild ?
(as far as I can see the new bulb is the same as the old, they are both labeled SHP6 on the bulb, but lamp module is labeled 505-0631-02 on the old module and 505-0631-05 on the new module.

Obviously a rebuild is need to prevent the Viper100A failure, I think, do any of you know how the rebuild is done ? or how to prevent the Viper100A to fail again ?

Thanks.

i dont like working on those goofy *** LP340/350 supplies becuase of the stupid silicone blobs. any suggestions with that???

[Wombatten]

So mbates14 do have any clues for me on how to fix my projector?
for example this one?:?508 don´t know what this is transistor or diod ?? (it´s marked n5 JE)

[Lex-LP350]

Hi Wombatten, the piece marked as JE corresponds to a Vishay dual diode BAV99, you can download the datasheet:

http://www.vishay.com/docs/85718/85718.pdf

You can use any BAV99 (SOT23 package) like fairchild or maybe ON semiconductor, but they are marked as A7, no problem is the same part:

http://www.fairchildsemi.com/ds/BA/BAV99.pdf

http://www.onsemi.com/pub/Collateral/BAV99LT1-D.PDF

Also, you can purchase them at:

http://www.newark.com

[Wombatten]

Ok! thanks a lot for your help Lex-LP350

[Issydad]

Dear all,

reading this thread the upgrade/rebuild to the LP530 power supply necessary to allow it to drive the new 5F bulb is mentioned but not described.

I have an old LP530 which I want to modify to take the new bulbs (missed free infocus upgrade by 2 weeks!)

Electronic engineer so happy to solder on. Anyone able to describe the modifications necessary?

thanks in advance