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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Wed Dec 16, 2009 12:54 pm Post subject: |
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| stefuel wrote: | How novel. A projector with no fuses.  |
the fuse is ok (I only know one located with main power wire).
i have give the YA board to my reparator. Hope he will test it and find the issue.
Does anybody could show me a picture of a relay that switch on the projector?
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RogueChili
Joined: 31 Mar 2008
Posts: 162
Location: Westfield, MA
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| Posted: Thu Dec 17, 2009 2:52 am Post subject: |
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The fact that the nothing happens when you press the on button leads me to believe either the SIRCS decoder chip is not functioning or the “POWER CONT” line is shorted to ground. The SIRCS chip (power on control) functions independent of the Y board (CPU) by design allowing the system to attempt to power on with failed software or CPU.
In an effort to diagnose this to the BOARD LEVEL I recommend the following procedure:
Remove mains power; remove the Y board from CN1; with an ohm meter measure the resistance across pins 2B (POWER CONT) and 3B (GROUND) of CN1. I would expect a minimum resistance of 1000 ohms.
Let us know what you find
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Fri Jan 08, 2010 5:19 pm Post subject: |
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I am not really sûre id.. I did Well: i removed thé Y board. Then i try to get my multimètre into the homes of thé connector on the board where theY board were plugged. There is 0 ohm, but may be the plugs of my multimeter are not thin enough. I can't go deep to thé connector without removing everything. I did thé salle mesure on thé Y board connector and i found 750 ohm.
I hope this help...
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Fri Jan 15, 2010 7:37 pm Post subject: |
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I have ordered a new Y board. but I now wonder if it is a good idea???
I can also buy a power supply, with the 2 board on the top for 200$. But I don't want to spend monney for nothing. WHat are your advises???
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Sun Jan 17, 2010 5:14 pm Post subject: |
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| RogueChili wrote: | The fact that the nothing happens when you press the on button leads me to believe either the SIRCS decoder chip is not functioning or the “POWER CONT” line is shorted to ground. The SIRCS chip (power on control) functions independent of the Y board (CPU) by design allowing the system to attempt to power on with failed software or CPU.
In an effort to diagnose this to the BOARD LEVEL I recommend the following procedure:
Remove mains power; remove the Y board from CN1; with an ohm meter measure the resistance across pins 2B (POWER CONT) and 3B (GROUND) of CN1. I would expect a minimum resistance of 1000 ohms.
Let us know what you find |
I finaly did the measure you wre expectng on the 2B and 3B : there is 1366 ohms. It mean that it is correct?
I will send my Y board to a contact who has got a 1292 to test it.
What else can I do to try to troubleshoot the issue?
Additionnal question : if the power supply were bad, there should be an error code when i try to run the crt?
thanks in advance for support...
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RogueChili
Joined: 31 Mar 2008
Posts: 162
Location: Westfield, MA
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| Posted: Mon Jan 18, 2010 2:29 am Post subject: |
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OK, 1366 ohms is good and indicates none of the circuits connected to pin 2B (POWER CONT) line are shorted to ground.
So, if the following conditions are true:
> The red led on the Y board illuminates briefly when you turn on the main power switch
> The red “Stand By” led is illuminated when the main power switch is on
> After re-installing the power supply you connected the cables properly
> The power supply is working properly as stated in a previous post
then I would expect the problem to be the output from the Y board.
There is a method to verify if the Y board is the source of the problem however it will involve soldering a 100 ohm resistor across pins 1A and 2B on connector CN52 of the Y board.
Don’t make any solder shorts or incorrect connections; if you do there is a possibility of permanently damaging the Y board. Remove mains power before working on projector.
After installing the resistor, and reinstalling the Y board, continue a follows:
>Set main front power switch to off “0”
>Connect mains power to projector
> IN THE NEXT STEP DO NOT ALLOW THE PROJECTOR TO STAY ON FOR MORE THEN 1 SECOND, DOING SO MAY CAUSE SERIOUS DAMAGE TO THE PROJECTOR
>Toggle main power switch to on “1” for 1 second then off.
If the projector makes noise then the Y board is defective.
If you have any questions on this testing procedure please ask before attempting it.
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Mon Jan 18, 2010 8:19 am Post subject: |
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| RogueChili wrote: |
So, if the following conditions are true:
> The red led on the Y board illuminates briefly when you turn on the main power switch YES
> The red “Stand By” led is illuminated when the main power switch is on YES
> After re-installing the power supply you connected the cables properly YES, I assume
> The power supply is working properly as stated in a previous post YES, but the reparator has just cheked short circuit, bad composant and quality of solder.
then I would expect the problem to be the output from the Y board.
There is a method to verify if the Y board is the source of the problem however it will involve soldering a 100 ohm resistor across pins 1A and 2B on connector CN52 of the Y board.
Don’t make any solder shorts or incorrect connections; if you do there is a possibility of permanently damaging the Y board. Remove mains power before working on projector.
After installing the resistor, and reinstalling the Y board, continue a follows:
>Set main front power switch to off “0”
>Connect mains power to projector
> IN THE NEXT STEP DO NOT ALLOW THE PROJECTOR TO STAY ON FOR MORE THEN 1 SECOND, DOING SO MAY CAUSE SERIOUS DAMAGE TO THE PROJECTOR
>Toggle main power switch to on “1” for 1 second then off.
If the projector makes noise then the Y board is defective.
If you have any questions on this testing procedure please ask before attempting it. |
Thank you, it's good to get some help.
Regarding you retesting procedure sound like risky and can damage my entire CRT. I am not very confident with soldering, especially in this very narrow space. I would prefer to send my board to a friend who can install and test it on its own 1292. I assume it will be the same than your procedure, but without risk of damage...
Anyway, I have already order the Y board. I have just put in hold the shipment, waitting for confirmation my Y board is bad.
I really hope it is the source of the issue....
I let you know once I have the feed back from the board test.
Arnaud.
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Thu Jan 21, 2010 2:11 pm Post subject: |
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Some news.
THe Y board has been installed on another 1292 and it is starting proerly. Only, issue is there is a deviation in tube convergence.
My problem come from another board...
It is not a good news.
What should I do know????
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RogueChili
Joined: 31 Mar 2008
Posts: 162
Location: Westfield, MA
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| Posted: Thu Jan 21, 2010 2:36 pm Post subject: |
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As mentioned, the method used to test your power supply may not be adequate and the power supply may be faulty. Install and test your power supply in your friend’s machine.
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Thu Jan 21, 2010 2:38 pm Post subject: |
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Is there a way to test the power supply by myself. I have heard taht it must be tested "in charge". How to do so.
I am ready to send the power supply to my frien to test on its 1292, but it heavy and risky, so I would like to avoid...
Should i test the 2 board attached on the power supply as well?
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Mon Feb 01, 2010 4:53 pm Post subject: |
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Some news :
My power supply has been plugged on another CRt and it is not working. So it is the source of my issue.
I have ordered a spare power supply, I am waitning for it to restart my CRT. I have not oreder for the 2 boerds attached on the top of the PWS, could you confirm I don't need them?
Thanks to everyone for your support.
Curt were right from the beginning...
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dmarnold
Joined: 18 Jan 2010
Posts: 73
Location: St. Louis, MO
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| Posted: Mon Feb 01, 2010 8:11 pm Post subject: interesting thread... |
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love the vernacular(sp) 
me love this place long time!
_________________
enjoy today, for change is on the way
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Mon Feb 01, 2010 8:55 pm Post subject: |
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Another question comes in my mind: if i order a power supply in US, does it Will be only suitable for 110v or for 220v as well?
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Tue Feb 02, 2010 9:00 am Post subject: |
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I have double cheked the voltage issue :
in the 1292 spec ther is two version :
1292 QM is only 220 V
1292 Q is 100-240 V
I assume I have a 1292 QM, for european market. I assume that the US supplier where i buy the parts (srry curt, but you have no spares available to sell...) will provide a 1000-240 V.
IS it possible to plug the power supply of 1292 Q on a QM version?
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Graham Johnson
Joined: 07 Mar 2006
Posts: 241
Location: Melbourne Australia
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| Posted: Tue Feb 02, 2010 8:56 pm Post subject: |
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The supplies are both the same. They are both autoselectable supplies. There are a few differences in the common mode filters but they dont amount to much.
All you need to use a US power supply in Europe is a mains fuse change
_________________
Graham
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asubert
Joined: 01 May 2008
Posts: 26
Location: FRANCE
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| Posted: Wed Feb 10, 2010 6:21 pm Post subject: |
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i have just received my new power supply. the good news is that the 1292 start.
I am so happy
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