CurtPalme.com Home Theater Forum

[Rittberg]

Hi,
Yesterday my Barco 1209s started losing the picture after few minutes.
Tried several times to power again, the picture was gone after a minute. No picture from the source and no picture from the internal as ‘Set Up” etc.

So I start replacing the spare modules one after the other (Used parts purchased during many years) after each replaced part I checked to see if the if the problem was resolved:
I start with the QUADRUPLER -> SPLITTER -> SMPS -> and then all the boards from the MAGNETIC FOCUS & HOR. SHIFT -> SM POWER SUPPLY 2 + G2.
But NO GO – no any picture.

After all I ( I had to check it first…..) checked the EHT (R7617427)and I find the 2A fuse was blown.
Replaced the fuse but once again the fuse blown.

I put another EHT (R7627165) I see a very small size picture appear ,So I replaced with another EHT (R7617427-03) , I heard some noises (similar to blown fuses ) I shut down immediately the Barco.

Replaced the EHT to another once but no picture (checked the fuse and they are OK).
Once again checked the SMPS (replaced with a spare one) but no picture.

Can it be that the EHT damaged the replaced QUADRUPLER or the SPLITTER ?

I will appreciate to any Idea how to proceed .
Thanks

Attached pictures from the Barco:

[Rittberg]

Additional picture

[Hulio]

Check first if the red led on the EHT board is lit. If yes, the quad, splitter, EHT could be defect, or you have a shorted tube.
Aso, be aware that not each combination of mainboard/quad/EHT will work.

[Rittberg]

Hello Hulio,
Thank you .
Before you replied I already replaced once again the quad, splitter and the EHT.
I checked the EHT and one red led (in the attached picture) is on, do you mean this one ?.
I diconected the 3 cabels from the splitter and the Red led keep to be on .
Is there any other way to check if there is a shorted tube ?

[Rittberg]

After replacing to another EHT , now the red led is in another place . is it normal ?
still no picture .

[bluemoonhu]

Please carefully check the EHT board. The resistance and triode.

[Rittberg]

Thanks.
I have 5 EHT and I mount all of them one after the other.
The original one continue to blow the 2A fuse. but with the others No picture and a red led is on(in different places).

[bluemoonhu]

Please use the multimeter to check, the fault is easy to find

[Rittberg]

Where in The EHT should Check ?

[bluemoonhu]

[bluemoonhu]

[Rittberg]

Thanks,
In order to check and to reach the points you have mentioned , I should remove the Quad,
I understand that to check the points you indicate I should power on the Barco ?
Thanks.

[bluemoonhu]

Remove the EHT board from the machine and measure them with the multimeter

[Rittberg]

[bluemoonhu]

[Rittberg]

Hello,
Thanks for advices,
my original mounted EHT that keept blowing the 2A fuse looks different from the one in your pictures.
The EHT original pictureת is attached.

I have 4 spare EHT , one that looks indentical to the original and another 3 that looks identical as in your picture .

I installed and checked all my 4 spare but no picture, but I can see the a red led is on (in different place) depended in EHT one that is instaled .

Thanks for your support.

[bluemoonhu]

My EHT board is used for Barco CINE9, you need to test similar components

[Rittberg]

Installed once again an identical EHT, after starting the Barco the red led "EHT Hold Down" is on .
Any Idea ?
Thanks

[bluemoonhu]

Hulio said:Check first if the red led on the EHT board is lit. If yes, the quad, splitter, EHT could be defect, or you have a shorted tube.
--------It seems that you need to check three tubes separately for short circuits?

[Rittberg]