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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu May 18, 2023 1:20 am Post subject: |
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The deflection board is so easy to break, this is my fourth deflection board that is broken.
Once the deflection board is broken, it is likely that the power supply board is also broken。
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu May 18, 2023 4:37 am Post subject: Barco C7 image jitter |
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These two fuse resistors are burnt out
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sat May 20, 2023 4:23 pm Post subject: |
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I replaced two fuses, but the problem was not resolved. I checked the deflection board but couldn't find the cause. It's really disheartened
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu May 25, 2023 12:54 pm Post subject: Barco C7 image jitter |
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I seem to have noticed liquid on the circuit board below a capacitor on the deflection board. Is this capacitor already broken?
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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 May 25, 2023 1:17 pm Post subject: Barco C7 image jitter |
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| kal wrote: | Measure it and see.
Kal |
OK，I am ready to replace it。Thanks！
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri May 26, 2023 12:59 am Post subject: Barco C7 image jitter |
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More than one capacitor is leaking liquid, and this capacitor is also leaking liquid
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri May 26, 2023 1:01 am Post subject: Barco C7 image jitter |
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Both capacitors are of this model
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Fri May 26, 2023 1:05 am Post subject: |
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After replacing these two capacitors, I started up the cine7，but the fault still persists.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sun May 28, 2023 1:48 am Post subject: |
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Does the red light of the "SF" LED indicate that it is only a problem with the deflection board? Will other board failures cause "SF "to light up red? For example, the failure of the SMPS board。
I have repeatedly checked most of the components of the deflection board and found no problems.
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Sun May 28, 2023 12:55 pm Post subject: |
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Not only the deflection board can cause a lit SF led.
Could be also from the SMPS+EHT and RGB input and driver. Check first all 15 fuses on the smps.
I sent you a mail with the location and values of all fuses, as well as the schematics of the scannfail circuit of Cine 7.
I remember, when i had a Cine 7LT myself, disconnecting and reconnecting the linearity coil (big yellow coil mounted above the controller) also solved a SF led status. You can try that too (disconnect the 5 blue wires connector at the coil side, not the deflection board side).
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Sun May 28, 2023 1:38 pm Post subject: Barco C7 image jitter |
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| Hulio wrote: | Not only the deflection board can cause a lit SF led.
Could be also from the SMPS+EHT and RGB input and driver. Check first all 15 fuses on the smps.
I sent you a mail with the location and values of all fuses, as well as the schematics of the scannfail circuit of Cine 7.
I remember, when i had a Cine 7LT myself, disconnecting and reconnecting the linearity coil (big yellow coil mounted above the controller) also solved a SF led status. You can try that too (disconnect the 5 blue wires connector at the coil side, not the deflection board side). |
Thank you very much.
I have been checking the deflection board, replacing the fuse and several capacitors, and then repeatedly checking with a multimeter. No further problems were found because I still have three faulty deflection boards in my hand, which can be compared for inspection. Next, I will focus on checking the SPMS board.
For the GBR board, I have replaced it with another GBR board, but the fault still persists. In addition, in the two fault LED lights on the deflection board, the LED light in the center of the deflection board lights up when starting up. Can we eliminate the fault of the GBR board?
I will focus on the SPMS board.
Thanks!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Jun 01, 2023 5:40 am Post subject: |
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Thank you，Hulio
The "SF" fault code has been completely resolved, The fault of the GBR input board can cause the fuse of the deflection board to burn out . At present, the machine is operating normally, with normal convergence, geometric adjustment, etc. However, when there is no signal input, the grid pattern is Jittering , while when there is S-video input, the image is rolling.
https://youtu.be/sI8cEkCnC2s
https://youtu.be/OYRGfjuy7wY
Thanks
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Thu Jun 01, 2023 6:13 am Post subject: |
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OK, for the first problem I thought it was the splitter, but you already swapped it.
Regarding the second problem with active video on S- video, it seems a vertical hold issue.
On the deflection board, you have an aluminium box, with a small hole on the lower-right side. There you have P676 adjustment pot for vertical auto-lock.
While video is active, make small adjustments with a screwdriver, till the image is stable. Those trim pots can loose impedance over time.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Jun 01, 2023 8:45 am Post subject: |
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| Hulio wrote: | OK, for the first problem I thought it was the splitter, but you already swapped it.
Regarding the second problem with active video on S- video, it seems a vertical hold issue.
On the deflection board, you have an aluminium box, with a small hole on the lower-right side. There you have P676 adjustment pot for vertical auto-lock.
While video is active, make small adjustments with a screwdriver, till the image is stable. Those trim pots can loose impedance over time. |
The problem has been solved, perfect！
Thanks!
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Thu Jun 01, 2023 9:13 am Post subject: |
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You are welcome.
Well done, enjoy your Cine 7.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Thu Jun 01, 2023 12:39 pm Post subject: Barco C7 image jitter |
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| Hulio wrote: | You are welcome.
Well done, enjoy your Cine 7. |
Thank you very much!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Wed Jun 14, 2023 2:49 am Post subject: |
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Yesterday, when I was watching this C7 normally, a new condition appeared again. Prior to this, the machine had been running normally for several days. However, after about ten minutes of watching yesterday, the images began to deform, converge in disorder, geometric deformed and cannot be adjusted. I turned off and then turned on again, and the condition remained the same. The deflection board problem has been eliminated. I doubt which Potentiometer needs to be adjusted or the GBR board problem? Please guide, thank you!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Wed Jun 14, 2023 2:54 am Post subject: Barco C7 image jitter |
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pic1
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