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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 12:33 pm Post subject: |
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| mp20748 wrote: | | redfox001 wrote: | Why do you always play on the person when you are caught on a lie?
I estimate you add 10% truth to 90% lies. And those are educated estimates  |
Where is the lies..
You of all people are challenging me on things you have consistently proven you know absolutely nothing about, and you are adamant in your pursuit to be wrong consistently because you have contradicted yourself many times.
So who has been presenting lies here? |
there is the lie and the personal attack.
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 12:33 pm Post subject: |
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| gjaky wrote: | | the dude wrote: | | And internal protection diodes or avalance ratings are ALWAYS mentioned in datasheets. |
2N2369 is a commonly used avalance transistor yet it was not designed in that way, therefore there is no mention about this in its datasheets.
I think we all can can settle down with that Mike is allowed to remove the diodes on his own will, and leave him at that, no one else is forced to follow him with this. if he ever experience a defective transistor due to arc it will be his problem. All happy?  |
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 12:35 pm Post subject: |
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| the dude wrote: | | Quote: | | can you tell me WHY none of these transistors have failed from ARC damage? |
Maybe they did... these devices are made of several smaller transistors with the emitters tied together with resistors. Maybe the transistor is still functional to some degree if one of them is dead.
Yes!  |
What happened in my case is that the whole board (modified by Mike Parker) was still functioning with two dead transistors the gain was half. It seems there are two push pull stages and if one does not work the other still might.
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Last edited by redfox001 on Sun Feb 21, 2016 12:38 pm; edited 1 time in total
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 12:37 pm Post subject: |
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Guys looking at the equivalents of the other Sanyo RF transistors I do not see protecting diodes. Am I right?
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 12:49 pm Post subject: |
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| redfox001 wrote: |
What happened in my case is that the whole board (modified by Mike Parker) was still functioning with two dead transistors the gain was half. It seems there are two push pull stages and if one does not work the other still might. |
Now let me see where one of you experts can explain that this happened with that circuit design the Marquee uses. Come on anyone of you PLEASE help me to understand how this can happen when two of those transistors fail?????????
And before we go one. He had a gain issue that we solved by email, that required him to only change the ground resistor of the first stage op-amp. From there is where he mentioned that the gain problem was fixed and he then goes on praising the work and how much better things were over his stock boards....this has been mentioned sooo many times that I don't feel I need to find that link again..
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 12:51 pm Post subject: |
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| redfox001 wrote: | | Guys looking at the equivalents of the other Sanyo RF transistors I do not see protecting diodes. Am I right? |
The Sanyo transitors are NOT RF transistors. They were designed specifically for Video
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 12:52 pm Post subject: |
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Because those boards drive K and G1 ?
When the k or G1 drive failes completly, there will be less gain. Thats all.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 12:55 pm Post subject: |
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| the dude wrote: | Because those boards drive K and G1 ?
When the k or G1 drive failes completly, there will be less gain. Thats all. |
Ah yes that is the correct explanation. I still have a lot to learn from you guys. Thanks!
Fun was that the bandwidth greatly improved to with half gain. So initially I wrote Mike Parker thanks what a bandwidth those modifications have (at least on this one board). I was very happy untill I did a calibration and arrived at 5 ftL and an impossible gamma to match with the other two. My first review on this forum was based on that half functioning board.
Also funny is that 5ftL does not even look so bad
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 1:01 pm Post subject: |
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| the dude wrote: | Because those boards drive K and G1 ?
When the k or G1 drive failes completly, there will be less gain. Thats all. |
If either fail and the other still works, the overall image would be distorted. Think of it as Dual Push-Pull or Differential, where Balance is critical for for proper operation. And to add, with one being out that would not necessarily lower the gain.
You can disconnect either one of them and only see a slight loss in gain, but if one channel fails, that failure would cause distortion.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:03 pm Post subject: |
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From a mail on 17 march 2015
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But more problematic was the drive setting. I had to set blue drive to 0 and Green drive to 100 to get close. Red was somewhere halfway. So it seems blue is to bright still or green is to dimm or both.
But than I had a somewhat calibrated picture and somewhat focussed picture and I watched some movie material and it is already clear that there is a lot of detail in the shadows and that thinks like clouds of smoke are better distinguishable than with the barco. It also seemed very sharp despite the bad focus and astig. Much sharpness dept and detail. This looks good.
The bandwidth testpicture looked perfect.
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 1:04 pm Post subject: |
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Why? That makes no sense. If the transistors get conductive because of arcing there will be at least DC at the output or no output at all.
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 1:06 pm Post subject: |
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| Quote: | | Balance is critical for for proper operation |
No, it isn't as long as the ABL can set correct black level.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:08 pm Post subject: |
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Or this email 19 march 2014
Great. But remember you have to use 1% resistors. I would say use what you have for now, but try to replace the the exact eventually
Sent from my T-Mobile 4G Android device
tjeerd***@me.com wrote:
Yes! I am starting to see some of your miracle work here. I cleaned the boards much better with alcohol and removed more potting. In that proces I damaged one blue smd resistor but I took it from an old board it was R91 261 Ohm (it has the numbers 2610). The SMD resistors I can buy here are 270 Ohm. Is this a special resistor? It was the same on the old and on the new boards.
But I managed to get the brightness and contrast equal on all three. The blue board is now on the red tube and the red board on the blue tube. I had to set green drive close to 100 to match everything so there is still some variation.
I watched a smpte pattern and it seemed green is very high in bandwidth and red is a little lower but perhaps it is focus?
Than I watched a part of the Hobbit that I had recently seen on the 909 and man even with bad convergence focus and astig it was sharper or more detailed and very very deep black levels. It looked very promising!
I had the Marquee on for 1/2 an hour.
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Last edited by redfox001 on Mon Feb 22, 2016 3:14 pm; edited 1 time in total
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redfox001
Joined: 16 Mar 2009
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Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:10 pm Post subject: |
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But when I repaired the neckboard the bandwidth was just like the other two and a lot of detail was gone.
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 1:19 pm Post subject: |
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| the dude wrote: | | Why? That makes no sense. If the transistors get conductive because of arcing there will be at least DC at the output or no output at all. |
I'm not sure you're understanding what's going on in that circuit, or better, you actually believe what you've been told on this. And what is the ARC reference to?
The gain on those boards was on ALL three of them. We solved that by email on one of the boards and he was supposed to do the same on the others. He did not have suggested SMD's so he used leaded 1/2 watts. The plan was for him to order the SMD's and replace them in that only spot on the boards. he then took it on himself to go further into the boards and that's when things got messed up. And this was his admission...he said "he messed the boards up and should not have went further after I told him not to"
And because he went against what I told him, that is why the boards were never repaired by me, because he had admitted to damaging them. Not sure how many times I'll need to go over this, but a simple solution to the problem would have resulted in him sending that one board back to me for repair, but the reason that did not happen and based on his own admission, he did whatever he did to all three.
The only way I could be at fault is if I refused to repair or were not able to fix the damaged board that failed. We never got that far, because he started doing eaxctly what he's been doing in this thread... believing he can fix and make things better.
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 1:20 pm Post subject: |
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Oh, this is getting a little bit off topic... I don't want to prove Mike is wrong any longer, i proved it before i think. This is pointless and does not give us a better picture anyway.
Just a little comment on push/pull drives: There is no need to balancing anything. Think of the barco as a special case with G1 tied to ground and K doing all the work. It would be OK to do K 50% and G1 50%. Or K 70% and G1 30%. It does not matter. The only important thing is that the amps don't clip, the ABL can work correct and cut off conditions can be archieved.
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redfox001
Joined: 16 Mar 2009
Posts: 2257
Location: The Netherlands
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| Posted: Sun Feb 21, 2016 1:22 pm Post subject: |
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Now interesting is that the low bandwidth came from the changes he made in the compensation between the motorolla's. L7 and R24 where changed. When I talked to Stridvogden about this he said that they had worked together to lower the peaking on the motorolla's.
I hypothised that they might have messed up the compensation here because Strid hates any peaking even when it is needed. So I took standard boards removed the diodes and look there was the bandwidth and sharpness I was hoping for! Correctly compensated by the Marquee engineers. Some variation was detected on some boards because of unpredictable gain tolerances.
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Last edited by redfox001 on Sun Feb 21, 2016 1:30 pm; edited 1 time in total
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 1:24 pm Post subject: |
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| the dude wrote: | | Quote: | | Balance is critical for for proper operation |
No, it isn't as long as the ABL can set correct black level. |
Man, you're something else here, how is it you can make such bold comment about a circuit you obviously have no experience with. Duid someone forget to tell you that THEORY is not always FACT.
The Marquee does not have ABL...and even if it did, it would not act as a balance control for those amplifiers.
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the dude
Joined: 11 Sep 2013
Posts: 179
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| Posted: Sun Feb 21, 2016 1:27 pm Post subject: |
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| Quote: | | what you've been told on this. |
I've been told nothing by no one. I just can read circuit diagrams and have "a little" understanding on electronics.
| Quote: | | And what is the ARC reference to? |
This is because i suspect a arc destroyed the transistors, therefore they became conductive.
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mp20748
Joined: 12 Sep 2006
Posts: 5689
Location: Maryland
TV/Projector: 9500LC Ultra / Super 02 and 03 VIM
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| Posted: Sun Feb 21, 2016 1:30 pm Post subject: |
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| redfox001 wrote: | | Now interesting is that the low bandwidth came from the changes he made in the compensation between the motorolla's. L7 and R24 where changed. When I talked to Stridvogden about this he said that they had worked together to lower the peaking on the motorolla's |
| Quote: | | I hypothised that they might have messed up the compensation here because Strid hates any peaking even when it is needed. So I took standard boards removed the diodes and look there was the bandwidth and sharpness I was hoping for! |
So we messed up the peaking and compensation circuit, but you are the only one that this has happened to. And with your great insight into our mess-up you then decide to repair the boards yourself...so could you also explain at what point did you decide to get someone else involved and how was it that you two made the boards better?
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