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Post by radiohead314 on Mar 5, 2016 22:50:25 GMT -5
Did you measure it out of circuit? It should measure like a normal NPN transistor. Q1 could also cause the fuse to blow. If one of these has failed I would change the TDA4601 as well. It shorts in every direction between all pins. It did indeed blow F100. So you are saying the TDA4601 should protect Q1 and there is a good chance the TDA is malfunctioning. Good point. Oh wait it is Q101 the high voltage of the horizontal. |
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Post by radiohead314 on Mar 5, 2016 9:54:12 GMT -5
One more question about the fuse F100. Is it a slow or a fast fuse? I see this in the part description F100 : F 5x20 F 3A15 H UL. The F could mean Fast or fuse. 5x20 are the size. Next F fast? 3A15 is the amperage. But H and UL?
Probable fast.
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Post by radiohead314 on Mar 5, 2016 7:16:22 GMT -5
Very interesting. I think this is the missing part of the non 4k digitals. In crt the beam shape takes care of a Gaussian blur that works like a low pass filter on the light (perhaps a little to much filtering since the video dac does it too). With digital these shifting solutions do a sort of random Gaussian blur to taking of the edges doing a correct filtering of the signal. At 4k resolutions our eyes do the filtering and it is not needed anymore.
If i go to digital dlp I would want to have something like this.
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Post by radiohead314 on Mar 5, 2016 6:32:40 GMT -5
Yes the price is attractive but I buy the German parts  |
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Post by radiohead314 on Mar 5, 2016 4:36:42 GMT -5
Is there any risk in buying cheap Chines parts from ebay? I remember something that the Chinese now and than fake chips? Or only change the print on other chips with the same package?
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Post by radiohead314 on Mar 5, 2016 4:34:36 GMT -5
I made up a cover based on Casey's picture and the unit runs much cooler. I will set up the spare tray with the controller that has the 3.11 software and see what the differences are. I have a third controller that has a suspect IC56 (TLE2074A) There are a number of these on the controller board. Does anyone have a dead controller board they don't wont? He nice idea. I have one with no cover. How did you make it? |
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Post by radiohead314 on Mar 4, 2016 14:15:14 GMT -5
Ok perhaps with others the pots where adjusted wrong and without a scope it is difficult to get them right. Taking them off will result in a not so good bandwidth. Perhaps that is why they got a negative name.
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Post by radiohead314 on Mar 4, 2016 13:55:50 GMT -5
From the schematics I see this one makes the HTHD. I can check if that one is afjusted right I guess.
I remember that is the past I had a few times that the barco would not start with a scanfail led burning. I think that must have been that the hthd was off. Some times than without doing anything the led went off and the barco would start.
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Post by radiohead314 on Mar 4, 2016 13:30:49 GMT -5
Well it is not as bad as the title suggests but this SMPS suddenly eats the main fuses F100.
When checking with my multimeter the right side of F100 was shorted to ground.
Now it turns out that Q101 the Sanyo 2SC3998 was shorting to ground.
From the schematics I see that this power mosfet is switched fast drawing current through the transfomator coil. Now I wonder what makes such a mosfet suddenly die? Does this just happen now and than after a lot of years or should I look further for a cause?
I plan on buying 5 of them and replacing and trying. Could also measure some of the passive components nearby.
by the way all fuses on the secondary side are ok.
Another smps works fine
the subboard works fine
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Post by radiohead314 on Mar 4, 2016 10:07:57 GMT -5
Oh i see, ive not looked. Is it only there when Option 1 is turned on in the menu? What effect does it have? Could be I can not check because I am repairing a smps. |
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Post by radiohead314 on Mar 4, 2016 5:39:33 GMT -5
It is in the main menu below picture tuning geometry etc. v3.12
Seems to be both focus and convergence.
In my case it is 35V
In the owners manual it is mentioned as an option 6.10
When available?
Only available as an option.
What can be done?
The voltage for the convergence and focus outputs that is tracked with the line frequency, can be extra turned up or down depending on the projected image.
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Post by radiohead314 on Mar 3, 2016 23:43:35 GMT -5
So to make things clear. Standard moome. Standard vim with trimpots. Standard new style neckboards. I did not expect this performance at all. Very surprised. I might still find some bad points when watching movie material or judging noise. If I overlooked something please say so. If I need to test something also say so. I want to know the truth on these and I am going to scope the hell out of them  |
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Post by radiohead314 on Mar 3, 2016 23:38:55 GMT -5
When calibrating nice and using contrast 72 where everything seems ok I get between 10 ftL and 10,5 ftL white intensity. With worn tubes that is not bad at all. I also looked at the gamma at contrast 72 as there are stories that these have very strange gamma that break up or something. Well this one has a very normal gamma of 2.4. I have seen them a bit flatter but you will not notice this. It has been said that the gamma is not completely flat because the tubes are badly worn.  Untitled by Radio Head, on Flickr  Untitled by Radio Head, on Flickr |
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Post by radiohead314 on Mar 3, 2016 23:34:30 GMT -5
Look at this, 9ftL just green so that is something like 11ftL white with contrast 70. No strange thingss incredible bandwidth. What is there to improve? But this was with g2 a bit high. They are a bit dimmer like 10 ftL The multiburst shows that 4 3 2 1 pixels come at the same intensity. No bumbs or non linearity. Also the whole greyscale from 10 ire till 100 ire 1080p is 100% resolved. Never seen that before.  Untitled by Radio Head, on Flickr  Untitled by Radio Head, on Flickr  Untitled by Radio Head, on Flickr  Untitled by Radio Head, on Flickr  Untitled by Radio Head, on Flickr  Untitled by Radio Head, on Flickr |
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Post by radiohead314 on Mar 3, 2016 23:25:28 GMT -5
I tested my 9518lc with standard new style neckboards and vim with trimpot and lugs. I looked if it was true that the gamma had a problem but it went reasonable straight, no problem when I maxed the lightoutput around 10 ftL on worn lugs. The bandwidth was exeptionally good it was good compensaed with the trimpot on the vim in my case at 1080p. From low till high ire levels perfect 1:1. This surprised me after all the stories that these newest marquees where the worst ever. My findings are that they do not need any mod in the video. Probable the noise mods have to be done on other boards and other performance mods might still be usefull.
To better judge thse I need to watch some movie material and I need a bigger testscreen in my test setup.
I will post some of my testpictures to better point out my findings.
So surprised about these machines!
Have to see how the blacklevels are. Might need a mod with the switching stuff on the vim and the lines?
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