Help with InFocus LP340 - Page 9

Gcalo · 18th February 2011, 07:54 PM

I have attached the schematic for the power supply.

Problem is that it's impossible to identify suppliers for some components!

Infocus will give no info. Their line is to send the unit in for repair for $500.00.

What a racket!

If anyone knows where to find T1 in schematic let me know!

Gcalo · 18th February 2011, 07:56 PM

AXLP

From whom have you been able to order parts?

InFocus does not sell them!

Gizmotech · 01:42 AM

The Capacitor (c16) and Zener Diode (u2) he replaced is widely available in any electrical store.

Gcalo · 19th February 2011, 02:04 AM

Yes I can get the parts from Mouser w/my regular orders, but I was inquiring about other parts on the P/S.

Is that cap and the Viper usually what causes the probs?

We think we are ready an open winding on T1 in the 7-12 pin area. Any experience there?

Gizmotech · 03:29 PM

Well it your symptom is a lifeless projector and nothing happens when the power cord is connected, not even the power led lights up, then the likely cause is just the c16 Capacitor. The viper fault is usually when there does seem to be some life in the projector but the lamp won't come on. However this applies to the models AXLP was talking about and not the LP730 or LP340. Not sure which model you have.

Gcalo · 19th February 2011, 03:28 PM

You are a wizrd indeed. Those are the symptoms!

I will replace that cap and let you know.

Many thanks.

dededu39 · 20th December 2011, 11:18 PM

Hi all,
Could someone give me the value for R514 ?
My board is not exactly the same as descripted in InFocus PSU Schematic.pdf.

Jofu Barox · 2nd January 2012, 08:45 PM

dededu39: If this is an Astec AA21620 PSU from a LP340, then I think you'll find it is 2K - see Help with InFocus LP340 - and note that other components are likely to have blown / will need replacing.

ThunderGod · 1st February 2012, 06:19 AM

I have two Infocus 7200's with the same symptoms. (some activity on powerup, but bulb will not light up). Does anyone know anyone that can repair this? I am willing to send the power supply and pay for the repair. Otherwise, any suggestions on where I can bring it to get it fixed? Thanks,

Wisiwyg · 3rd June 2012, 01:12 PM

I've had a similar power supply problem with my MT8 (SP7200). It's been repaired twice, about a year apart. This third time I found this forum and repaired by the directions above - C16 was visibly bad - swollen top of cap. I dropped in a 100uf 35v cap from local Radio Shack ($1.35) and it started right up.

Thank you for saving me more time and money.

19th February 2011, 01:34 AM	#83
Gizmotech diyAudio Member Join Date: Mar 2005	The Capacitor (c16) and Zener Diode (u2) he replaced is widely available in any electrical store. __________________ Projector bulbs, burners, lamps, reflectors and ballasts Last edited by Gizmotech; 19th February 2011 at 01:42 AM.

19th February 2011, 03:24 PM	#85
Gizmotech diyAudio Member Join Date: Mar 2005	Well it your symptom is a lifeless projector and nothing happens when the power cord is connected, not even the power led lights up, then the likely cause is just the c16 Capacitor. The viper fault is usually when there does seem to be some life in the projector but the lamp won't come on. However this applies to the models AXLP was talking about and not the LP730 or LP340. Not sure which model you have. __________________ Projector bulbs, burners, lamps, reflectors and ballasts Last edited by Gizmotech; 19th February 2011 at 03:29 PM.

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18th February 2011, 07:56 PM	#82
Gcalo diyAudio Member Join Date: Feb 2011	AXLP From whom have you been able to order parts? InFocus does not sell them!

19th February 2011, 02:04 AM	#84
Gcalo diyAudio Member Join Date: Feb 2011	Yes I can get the parts from Mouser w/my regular orders, but I was inquiring about other parts on the P/S. Is that cap and the Viper usually what causes the probs? We think we are ready an open winding on T1 in the 7-12 pin area. Any experience there?

19th February 2011, 03:28 PM	#86
Gcalo diyAudio Member Join Date: Feb 2011	You are a wizrd indeed. Those are the symptoms! I will replace that cap and let you know. Many thanks.

20th December 2011, 11:18 PM	#87
dededu39 diyAudio Member Join Date: Dec 2011	Hi all, Could someone give me the value for R514 ? My board is not exactly the same as descripted in InFocus PSU Schematic.pdf.

2nd January 2012, 08:45 PM	#88
Jofu Barox diyAudio Member Join Date: Jan 2012	dededu39: If this is an Astec AA21620 PSU from a LP340, then I think you'll find it is 2K - see Help with InFocus LP340 - and note that other components are likely to have blown / will need replacing.

1st February 2012, 06:19 AM	#89
ThunderGod diyAudio Member Join Date: Feb 2012	I have two Infocus 7200's with the same symptoms. (some activity on powerup, but bulb will not light up). Does anyone know anyone that can repair this? I am willing to send the power supply and pay for the repair. Otherwise, any suggestions on where I can bring it to get it fixed? Thanks,

3rd June 2012, 01:12 PM	#90
Wisiwyg diyAudio Member Join Date: Jun 2012	I've had a similar power supply problem with my MT8 (SP7200). It's been repaired twice, about a year apart. This third time I found this forum and repaired by the directions above - C16 was visibly bad - swollen top of cap. I dropped in a 100uf 35v cap from local Radio Shack ($1.35) and it started right up. Thank you for saving me more time and money.