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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Posted: Sun Apr 06, 2014 2:05 am Post subject: Barco filament voltage power supply and improvement |
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Barco 120X and 808 series power supply has a basis adjustment voltage is 17V, according to some people who practiced this reaction 17V reference voltage for improved picture some benefits . The reference voltage is 17V main power output one group , it means that all elevated improve low voltage power supply section. Improve the low voltage power supply circuit on the back of the site harmless, because behind the voltage requirements for sensitive circuits such as the 7812 has a three-terminal regulator IC to maintain a stable voltage output. A low-pressure part of the power supply to improve the stability of the machine does not produce any effect or increase the failure rate , but this is only a negative effect of increasing the already high acceleration voltage of the filament cathode projection tube aging.
Barco 's entire filament voltage is high , for example in 808S 17V filament voltage level , then there will be about 6.8V, 6.3V required more than 9% of the filament , usually filament voltage (average 6.3V) increase in life expectancy will drop by 5% to 30% . It is also super 8000 hours Barco machine even if India is not deep launch capability also dropped for a reason. The solution is a resistor in series with the filament power supply so that the voltage output is 6.35V to ensure the ability to launch tube as long as possible , my approach is to raise the reference voltage 17V to 18V and 0.7 Europe 2W resistor in series .
As for the effect of increasing the reference voltage 17V I did a comparison, in short, do not hurt for the Barco all series .
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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Posted: Sun Apr 06, 2014 2:10 am Post subject: |
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Filament voltage of 17V test point
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| Filament voltage of 17V test point |
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Sun Apr 06, 2014 4:43 am Post subject: |
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Will it improve anything on a 909?
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Barco Cine 9, ,Sony VPL570ES 4K SXRD, 135" OZ Theatre Majestic 16:9 screen, Denon X6700in preamp mode, 2x 7ch Tonewinner amps, 2x Tonewinner 15" subs, 2x 10" subs, 7.2.6...
RUNCO DTV991 LC ( NEC XG 852 LC ) 100" 4:3 screen, H/K AVR 7.1...
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Hulio
Joined: 15 Apr 2006
Posts: 494
Location: Belgium
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| Posted: Sun Apr 06, 2014 10:46 am Post subject: |
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Nice job zxh398.
| CasetheCorvetteman wrote: | | Will it improve anything on a 909? |
909 is a very complex and protective chassis. My guess is that even it will improve some things, it can generate a projector shutdown. Most of the voltages are microprocessor conrolled so playing with reference 17,3V on the SMPS could upset the machine.
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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Posted: Sun Apr 06, 2014 11:38 am Post subject: |
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909 power supply design may differ from the reference voltage may be 17V. But I think perhaps using Barco 909 6.8V filament voltage
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Mon Apr 07, 2014 9:45 am Post subject: |
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For the BG808s SMPS R7621706 has filament voltage trimpot. The R7621705 does not.
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VideoGrabber
Joined: 09 Apr 2006
Posts: 933
Location: Michigan
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| Posted: Mon Apr 07, 2014 3:12 pm Post subject: Re: Barco filament voltage power supply and improvement |
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| zxh398 wrote: | Barco 120X and 808 series power supply has a basis adjustment voltage is 17V, according to some people who practiced this reaction 17V reference voltage for improved picture some benefits . The reference voltage is 17V main power output one group , it means that all elevated improve low voltage power supply section. Improve the low voltage power supply circuit on the back of the site harmless, because behind the voltage requirements for sensitive circuits such as the 7812 has a three-terminal regulator IC to maintain a stable voltage output. A low-pressure part of the power supply to improve the stability of the machine does not produce any effect or increase the failure rate , but this is only a negative effect of increasing the already high acceleration voltage of the filament cathode projection tube aging.
Barco 's entire filament voltage is high , for example in 808S 17V filament voltage level , then there will be about 6.8V, 6.3V required more than 9% of the filament , usually filament voltage (average 6.3V) increase in life expectancy will drop by 5% to 30% . It is also super 8000 hours Barco machine even if India is not deep launch capability also dropped for a reason. The solution is a resistor in series with the filament power supply so that the voltage output is 6.35V to ensure the ability to launch tube as long as possible , my approach is to raise the reference voltage 17V to 18V and 0.7 Europe 2W resistor in series.
As for the effect of increasing the reference voltage 17V I did a comparison, in short, do not hurt for the Barco all series. |
Could someone who understands what is being said here explain it to me? 
I have a vague impression of what this is about, but things like, "It is also super 8000 hours Barco machine even if India is not deep launch capability also dropped for a reason." have me completely baffled.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Mon Apr 07, 2014 3:48 pm Post subject: |
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| zxh398 wrote: | | 909 power supply design may differ from the reference voltage may be 17V. But I think perhaps using Barco 909 6.8V filament voltage |
For the 909 the filament voltage starts up at 6.3V, and is switched to 6V after one minute.
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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Posted: Tue Apr 08, 2014 12:17 am Post subject: |
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909 If the filament voltage is 6.3V are perfect, EHOME SONY NEC filament voltage is 6.3V. So Barco 120X808 Series 6.88V using high voltage, high filament voltage can cause premature aging CRT cathode
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zxh398
Joined: 05 Nov 2009
Posts: 55
Location: china guangzhou
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| Posted: Tue Apr 08, 2014 2:14 am Post subject: |
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I feel used 8,000 hours of Barco's launch capabilities will be some decline, and many EHOME even with more than 10,000 hours of time can still have good strength and ability to focus. Accurately grasp this and think there is a direct relationship between the filament voltage
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