Help with InFocus LP340

[buschfunker]

Thank you, jeffdak.

R591 ... R595 = 3321

Could you tell me the values of R501, R502, R503, R504, R505, R506, too?

Best regards,
Chris

 

[jeffdak]

Thank you.

The resistor values are:

R500 = 1000
R501 = 1001
R502 = 2431
R503 = 2872
R504 = 4750
R505 = 1000
R506 = 7501
R507 = 2431

http://i34.tinypic.com/2q89feb.jpg

http://i33.tinypic.com/2e35r0k.jpg

 

[laplacexform]

Hello everyone. I am a newbie on the forum and need to contact mbates14 about the power supply issue on an LP350 that I was just given. The projector still works well, aside from the incessant light/dark flashing of the picture, which I assume is the power supply. I dont want to buy in to InFocus' ploy to get more money from me with an upgrade -- I just want a working projector . Any help would be greatly appreciated! Thanks!

 

[mbates14]

Make sure your lamp isnt bad first.

 

[laplacexform]

That is quite possible, as it is a brand new lamp (and it carries a warranty, too). I am just worried that the power supply is going to blow because I'm using the SP-LAMP-3F instead of the SP-LAMP-3E with the original power supply.

 

[mbates14]

Dont think its going to matter too much.

If you have to, the replacement lamps from ywh work perfectly fine with that model of power supply, so you can "re-lamp" your old/bad lamp and be fine.

 

[mbates14]

Sorry, i have been away from the forums for awhile, so any of you that have posted questions for me, im just now getting around to reading them.


Those power supplies are a design flaw by themselves.

I was doing work for a guy in Georgia repairing a mass load of these power supplies and has gotten to the point where its getting monotonous looking at them daily, hehe. I don't have a problem fixing them, but its at the point now where im getting scrapped for time. So any of you that need their supply fixed, about 85% of the time, I can fix them, but it may take a little longer than usual.

However, i can usually repair a wide variety of power supplies. I just fixed a couple of screenplay models that were dead, no powerup.

 

[mbates14]

here is my repair notes on the LP500 series. (Version one of the boards, not version 2).

They are backwards compatble to SOME EXTENT on the LP340s.

 

[jeffdak]

Hello MBates

some time ago i posted this

quote:
Originally posted by mbates14
only real difference is the ignition voltage.

there are a series of 5 resistors, and another resistor directly under the ballast transformer that need adjusting/replacing.

This is not spam its just i would like to know the answer


Hi, could you elaborate which resistors exactly and their new values? I appreciate so much that info ..

I have a LP340B projector a new model lamp and power supply no upgraded. (I think in good shape)

Thanks

 

[mbates14]

look at my repair notes. the values may correspond.

 

[treyfsu7]

sp7200 issue

Mr MBates.....from reading these posts i see you know a great deal about Infocus and power supply issues. I have a sp7200 with the flickering light issue with the NMB power supply...any chance of repair? (as i have about pulled my hair out on this one)

 

[mbates14]

ahhh thats the one i was forgetting to mention. sp7200

 

[mbates14]

As far as repair, yes. I have repaired at least 4 or 5 of these. But only for totally dead symptoms.

 

[Tiotion]

Well well Mbates seems your the man to go to regarding blown power supplies. Id you dont mind id like to bother you a tad regarding a LP755 power supply, ASTEC AA20440. Projector was faulty when i bought it, so i opened up the power supply and found a few components which have exploded. Is it just a matter of replacing these blown components or are there others that i'd need to replace too?

Pics attached below

Thanks for any help in advance

 

[laplacexform]

Sorry to perpetuate my question, but does the flickering light issue often lead to blown power supplies? I really want to get both issues taken care of at once (new lamp and power supply fix). As I said, the lamp is under warranty -- I was just wondering what kind of turnaround time there is for an LP350. If I could get both issues taken care of (meaning, while I'm waiting for the lamp, if I could send out the projector to MBates and have him fix the power supply). This doesn't mean that I would expect any kind of priority; it would just help in the sense that I'm not going to be able to use it for a good week or so, so if I could utilize that week towards the total power supply repair turnaround time, it would be ideal. Thank you again for all of your help!

 

[treyfsu7]

infocus power supply

due to my acct being new i cant send you an email Mbates, but if you could fire me off the necessary info for repair, it would be very appreciative. Football season is underway and my backup projector isnt quite the same as the 7200. Here is my email....Treyfsu7@yahoo.com

 

[laplacexform]

Anyone have any ideas? MBates, if you could, e-mail me at laplacexformforebay@gmail.com Thanks!

 

[guennede]

Infocus LP540 Powersupply dead

Hello, my LP540-Powersupply is dead,
no 5V,3.3V....
High Voltage for the Bulb-circuit is ok.

I changed all caps, optocouplers, the TOP245YN-switching-circuit.
-> no success

Measuring with oscilloscope between Gnd and Drain of the TOP245YN shows very short pulses.
In my opinion, the transformer (CR 0351 573900917) is short circuited at the primary side...

any idea, where I can get a new powersupply, or a new transformer?

Signs on PCB:
E158063 KW0348
410-1828-20

any idea for a schematic?

Thanks in advance

 

[ywh]

Re: Infocus LP540 Powersupply dead

Hi guennede !
is your ballast of LP540-like 530?

 

[mmclendon]

InFocus Power Supply Repair

Mr mbates,

I have a dead InFocus power supply from my LP600. It was working fine up until the power was lost and now the projector will not power up (no LED, LCD etc).

I removed the supply and the fuse is good.

Do you still offer reapir for power supplies? Please email me if so and thanks for reading this.

Regards,

Mike