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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jan 21, 2023 1:06 pm Post subject: Barco 808S fault |
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This is a Barco BD808S fault machine. When the machine is started, the LED lights on each board will show green light, and the tubes can emit a high voltage sound of "zi zi", but the three tubes have no image， I suspect that the drive board is faulty
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jan 21, 2023 1:16 pm Post subject: Barco 808S fault |
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drive board( fault 808s)
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jan 21, 2023 1:18 pm Post subject: Barco 808S fault |
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drive board (good 808S)
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat Jan 21, 2023 1:21 pm Post subject: |
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I don't know how to solve it
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Jan 26, 2023 10:22 am Post subject: |
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Have you checked the EHT board for a RED LED. Look down the hole in the top of EHT to see LED.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Jan 26, 2023 2:51 pm Post subject: |
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If the EHT board is broken, the tube will not have high voltage sound .
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Jan 26, 2023 8:37 pm Post subject: |
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| bluemoonhu wrote: | | If the EHT board is broken, the tube will not have high voltage sound . |
Very true. However it does sound like an high voltage issue. I would check the EHT quad and splitter. I have heard arching from a quad and internally in a splitter.
Have you done that?
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri Jan 27, 2023 1:13 am Post subject: |
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| km987654 wrote: | | bluemoonhu wrote: | | If the EHT board is broken, the tube will not have high voltage sound . |
Very true. However it does sound like an high voltage issue. I would check the EHT quad and splitter. I have heard arching from a quad and internally in a splitter.
Have you done that? |
OK, I will check。Thanks!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon Jan 30, 2023 1:27 pm Post subject: |
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I replaced the EHT quad and splitter，I don't know whether they are in good condition.They have been idle for many years . After the machine was started, I found that the red light in the EHT board was on。
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon Jan 30, 2023 1:28 pm Post subject: Barco 808S fault |
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The EHT board
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Jan 31, 2023 8:12 am Post subject: |
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Okay so now we get to the issue. Which is an EHT issue.
I have attached a Scan Fail Circuit so you can see the components that might cause the red LED.
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Download |
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ScanFailCircuit.pdf |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue Jan 31, 2023 2:04 pm Post subject: Barco 808S fault |
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Can you tell me which component in the EHT board is prone to failure? 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: Wed Feb 01, 2023 3:11 pm Post subject: |
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None of them. The EHT boards are usually very reliable, unless the quadrupler shorts. If one of the EHT red LEDs is on, then you have a problem with the quadrupler or HV splitter... or a shorted tube.
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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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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Feb 02, 2023 12:37 am Post subject: |
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| Curt Palme wrote: | | None of them. The EHT boards are usually very reliable, unless the quadrupler shorts. If one of the EHT red LEDs is on, then you have a problem with the quadrupler or HV splitter... or a shorted tube. |
Thanks！
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Feb 02, 2023 12:37 am Post subject: |
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Thanks!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Feb 02, 2023 4:09 am Post subject: Barco 808S fault |
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After replacing the HV quadrupler，start the machine, the tubes can make 'ZI Zi" high-voltage sound, and no red LED lights up in the high-voltage board, but there is no image，Is it the problem with the drive board?
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