Main > Monitor/Video Forum
Hantarex polo/2 side of screen squashed
Harlock:
--- Quote from: princess prin prin on May 16, 2022, 08:23:22 am ---OK, you have the VGA/SVGA version (31KHz and higher). The sticker says the chassis is made for a Philips A59EAK552X44 tube (25"). The yokes on Philips tubes have a characteristic design that can't be confused with that of other manufacturers. If it looks like this it's a Philips, if not post a pic.
You'll have to remove the fan to see C97. It's not an electrolytic cap, it looks like a little box. The blue square is where the caps on the frequency switch board are and the red square is the linearity coil. It can be adjusted by turning the magnet at the bottom.
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I created a tool and played a bit with the linearity coil you showed me, tried turning it both ways but it just shrinked the whole image horizontally. My monitor for sure it's not like the one you showed me btw.
What should I do now? change the C97? to the same cap value (film capasitor 0.18uf/400V)? try anything else? Thanks again for your help.
princess prin prin:
That's a Panasonic tube so we can't be sure the value of C97 is correct for it. If you have a capacitance tester measure it and see if it has decreased a lot. Alternatively, get a few caps of increasing value and try them until the sides are as wide as the middle (a vertical bar test pattern is more helpful than in-game pictures). Try: 0.18, 0.27, 0.36, 0.47 (depending on where you buy them, the value could be in nanofarad so 180, 270, etc.). It's important that the voltage rating is the same (400V) and also the lead spacing (22.5 mm).
Harlock:
Thanks a ton, I will give a try and come back at you
Harlock:
--- Quote from: princess prin prin on May 16, 2022, 10:42:11 am ---That's a Panasonic tube so we can't be sure the value of C97 is correct for it. If you have a capacitance tester measure it and see if it has decreased a lot. Alternatively, get a few caps of increasing value and try them until the sides are as wide as the middle (a vertical bar test pattern is more helpful than in-game pictures). Try: 0.18, 0.27, 0.36, 0.47 (depending on where you buy them, the value could be in nanofarad so 180, 270, etc.). It's important that the voltage rating is the same (400V) and also the lead spacing (22.5 mm).
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Hey, I think It worked, although previous capacitor was fine, I bought some mkt capacitors (Actually it needed mkp, but I made a mistake and bought mkt ones although mkt worked for testing), I soldered some posts in order to try different ones, 0,366nF and some width twiking seems to do the trick.
It still has some slite weird quirks, like for example 2-3 brigther lines at the far left but they are hardly noticeable, the result is soooo much better than before and I really thank you that you helped, you are a true wizard in this area.
The only alarming thing I noticed through testing is that with larger C97 capacitor, the capacitor is getting hotter (yes it is rated for 400v) with using pandora box vga output, but it gets like A LOT hotter when I use a vga output from a laptop or a GBS-8200 (cga to vga converter). Although if I solder it on the proper side of the chassis it is almost under tha fan so it will help.
Also I think I created a tiny bending on the sides when I was testing linearity coil setting that can't get rid of with cushion pot, I will fix it probably with some more tweeking.
But overall it I am much happier with the result than before, I can't even grasp how you knew about the specific capacitor. :applaud:
princess prin prin:
--- Quote from: Harlock on May 20, 2022, 09:07:15 am ---It still has some slite weird quirks, like for example 2-3 brigther lines at the far left but they are hardly noticeable
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Check the solder joints of R142 in parallel with the linearity coil. It's a fact that without that resistor you get a jailbar/ringing effect at the left side. As it's pretty tall maybe it got knocked when you adjusted the coil?
--- Quote from: Harlock on May 20, 2022, 09:07:15 am ---The only alarming thing I noticed through testing is that with larger C97 capacitor, the capacitor is getting hotter (yes it is rated for 400v) with using pandora box vga output, but it gets like A LOT hotter when I use a vga output from a laptop or a GBS-8200 (cga to vga converter). Although if I solder it on the proper side of the chassis it is almost under tha fan so it will help.
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Not sure but I suggest to improve the solder joints of the 4-pin green header that connects C97 to the frequency switch board. Also, I see a lot of dust build up around the horizontal output transistor T22 that you better blow off to make it run cooler.
--- Quote from: Harlock on May 20, 2022, 09:07:15 am ---I can't even grasp how you knew about the specific capacitor. :applaud:
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Other monitors have this cap too so if you have the same issue you know what to look for.