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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 9:12 am Post subject: |
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The voltage of L14 is not very stable, and the fluctuation value is between 17.7-18.8v
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 9:19 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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The voltage of L14 is not very stable, and the fluctuation value is between 17.35-18.8v
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Mon May 30, 2022 9:27 am Post subject: |
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Try to adjust the voltage to 16,8V with pot P3, shut down and restart the projector. Does the 17V diagnostic led is on ?
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 9:40 am Post subject: |
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| Hulio wrote: | | Try to adjust the voltage to 16,8V with pot P3, shut down and restart the projector. Does the 17V diagnostic led is on ? |
P3 adjustment is counterclockwise or clockwise？
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Mon May 30, 2022 9:53 am Post subject: |
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If I remember correctly, clockwise is increasing and counter clockwise is decreasing the voltage. Just slowly adjust while watching the multimeter, and you'll see.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 10:10 am Post subject: |
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L14 is adjusted to 16.8V, but the voltage is not very stable, the maximum value is limited to 16.8v。。。 restart the projector, the fault is the same as before.
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Mon May 30, 2022 10:19 am Post subject: |
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Ok, put the voltage back where it was and check the electrolytic capacitor C45, next to L14. It should measure 470M, but you'll have to check it out of the circuit (at least 1 leg disconnected).
Than check all those removable fuses for continuity.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 10:25 am Post subject: |
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| Hulio wrote: | Ok, put the voltage back where it was and check the electrolytic capacitor C45, next to L14. It should measure 470M, but you'll have to check it out of the circuit (at least 1 leg disconnected).
Than check all those removable fuses for continuity. |
OK!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 12:06 pm Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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C45 is removed
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2372 Time(s) |
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Mon May 30, 2022 2:45 pm Post subject: |
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Can't your multimeter be set to capacitance ? It should read 470uF (with a tolerance of 10%).
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 3:20 pm Post subject: |
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| Hulio wrote: | | Can't your multimeter be set to capacitance ? It should read 470uF (with a tolerance of 10%). |
yes! Iwill buy a 470uF capacitance .
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Mon May 30, 2022 3:46 pm Post subject: |
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Alright. Make sure is 35V 105 degrees Celsius rated.
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 3:54 pm Post subject: |
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| Hulio wrote: | | Alright. Make sure is 35V 105 degrees Celsius rated. |
yes! three days later,I will get it.
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Mon May 30, 2022 4:11 pm Post subject: |
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Ok. In the meantime, you can also check the safety resistors SR20 and SR70. No need to desolder those, just check for the continuity, like a fuse.
SR20 is close to the quadrupler, SR70 in upper-right corner of the SMPS (close to those big capacitors).
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Mon May 30, 2022 10:29 pm Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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| Hulio wrote: | Ok. In the meantime, you can also check the safety resistors SR20 and SR70. No need to desolder those, just check for the continuity, like a fuse.
SR20 is close to the quadrupler, SR70 in upper-right corner of the SMPS (close to those big capacitors). |
Good!
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue May 31, 2022 2:09 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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SR70
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2336 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue May 31, 2022 2:10 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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SR20 or R20?
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2335 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue May 31, 2022 2:58 am Post subject: |
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SR20 or R20--269Ω，it's normal
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue May 31, 2022 3:58 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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SR70
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143.22 KB |
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2328 Time(s) |
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bluemoonhu
Joined: 16 Feb 2021
Posts: 259
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| Posted: Tue May 31, 2022 3:59 am Post subject: Barco 708MM “HOLD DOWN EHT” fault |
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SR70
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42.77 KB |
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2327 Time(s) |
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