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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Apr 21, 2022 1:18 pm Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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After my Barco 708mm is turned on, the crt tube could not light up, the LED at the front of the machine shows a red light, which means that it is ‘hold down EHT’ fault, I replaced a HV quadrupler, but the fault is still there. I don't know where the error occurred? Thanks!
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Apr 21, 2022 1:57 pm Post subject: |
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It can also be the HV splitter or a fault on the power supply board, or a short in one of the tubes. Disconnect the HV lead going to all tubes, and turn on the projector and see if the red EHT light still comes on. If so, I'd change the HV splitter next. I've got them for sale here:
https://www.ebay.com/itm/354011179765?hash=item526cb5eaf5:g:quoAAOSwLaBiWckq
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Apr 21, 2022 2:18 pm Post subject: |
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OK,I will test.
Thanks!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Apr 21, 2022 2:43 pm Post subject: |
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after disconnect the HV lead going to all tubes, “HOLD DOWN EHT” fault LED light still comes on.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Apr 21, 2022 3:32 pm Post subject: |
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I replaced the test with a spare HV splitter， The HV splitter is faulty. I may need a HV splitter and a RGB driver board of BG 808s
Thanks Curt
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Apr 21, 2022 4:10 pm Post subject: |
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I don't have the RGB driver boards any more.. I don't think.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 1:31 am Post subject: |
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Unfortunately, when I turned on the machine for the second time,The machine gave a bang， the 708mm shows ‘hold down EHT’ fault again，the HV splitter seems to be damaged，I don't know what happened？
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 3:42 am Post subject: |
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I may have made a mistake. I connected one end of the HV splitter to the casing. this is the most original installation method of 708mm, When I removed this line from the casing, and disconnect the HV lead going to all tubes, ‘hold down EHT’ fault LED light will changed from red to yellow，but the left end of the upper part of the machine made a sound，is this what Curt said about ' a short in one of the tubes'?
I don't know how to find the fault？
Thanks!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 3:50 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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This is the line
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 4:57 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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This is the element that makes a sound
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 5:06 am Post subject: |
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If the lead lines of all the tubes is connected to the HV quadrupler, the LED light will show ‘hold down EHT’ fault.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 5:44 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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This is "Disconnect the HV lead going to all tubes", LED light is normal，but the element that makes a sound ,and the neck of the green tube flashes
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 5:44 am Post subject: |
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This is "Disconnect the HV lead going to all tubes", LED light is normal，but the element that makes a sound ,and the neck of the green tube flashes
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113.81 KB |
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6031 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 6:14 am Post subject: |
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This is "Disconnect the HV lead going to all tubes", LED light is normal，but the element that makes a sound ,and the neck of the green tube flashes
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440.02 KB |
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6025 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 6:58 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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I only disconnect the G2 line and HV Line of the green tube, after starting up，the 708mm running is OK
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6022 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 6:58 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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I only disconnect the G2 line and HV Line of the green tube, after starting up，the 708mm running is OK
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92.45 KB |
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6018 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 7:02 am Post subject: |
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I only disconnect the G2 line and HV Line of the green tube, after starting up，the 708mm running is OK
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460.09 KB |
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6015 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Apr 22, 2022 11:56 am Post subject: |
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Very regret，fault found, I broke the green tube while moving the machine.....Does Curt have the green tube? Thanks!
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kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Fri Apr 22, 2022 9:30 pm Post subject: |
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Are the tubes P16LNG22 ? If yes, I know a cheap set in good shape.
Are you located in Hungary ?
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