Hi, I recently purchased a new c64 reloaded mk2 and after the assembly I found that the main screen has really low contrast. The light blue text is quite dark, almost unreadable. I'm using the din plug. With the same cable, same screen, but other board I'm having a nice screen. Tried several vic chips, same result. Thanks.
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Don't Panic. Please wash hands.
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What VIC type are you using? And what Power supply are you using? Please post the output of the remote control menu if possible.
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I have tried 3pcs of 8565R2. The power source is some no name 12V 3A.
I will check the menu later.
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I have checked the menu, see nothing strange. Any special sub menu I should look at?
I have tried to look around on the board, and on the back side it looks like some nasty white stuff leftover all around. Looks a bit like corrosion. Checked the vic pins, haven't found any shorts.
Feels like the picture if heavily over saturated. Took some pictures, any way to share them?
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please create an account on the forum, then you can attach images
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it looks like some nasty white stuff leftover all around. Looks a bit like corrosion.
This is the dried leftovers from wave soldering. They are not conductive, they are on all C64RMK2 boards and they don't do any harm.
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Is this cable using Luma/Chroma or composite signals?
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The din cable is connected to pin 4, composite video out. I have tried now with svideo cable and same problem. Maybe just a bit better, but still far from perfect. Also tried 5 vic chips, same result with all.
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Do you have a possibility to measure the 12V supply? Since the output stage of the video part uses the 12V with only a little bit of filtering, a low voltage might very well be the cause. Please measure under load.
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Will do so, though I have tried with another power supply, 12V 2A, same result.
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12.26V when the blue screen is on.
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Wow - two valid digits after the comma? Is this a calibrated unit? I'm asking because the input stage of the C64RMK2 power should burn anything above 12.1V. If your measurement is accurate, the Z-Diode near the power input should have considerable temperature.
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Haha, no, it's not a calibrated unit, it's a cheap ass multimeter. You have to see that my hobby is not really electronics, but more retro gaming, so I don't really have the need of professional equipment.
So what can we do about the bad picture?
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Best thing I can offer is to take a look at the board here. Please ship with your PSU and chips installed, so we can measure what's going on without having to guess if the changed chips/PSU will cause a difference.
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Hi, thank you for the offer. Is it valid also if I bought it through a Swedish reseller? It was Ggs data.
What address and so?
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Yes.
The address and other details are here:
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Hi, package sent.
Tracking number is RR819616520SE
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Did it arrive?
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Jens is on vacation (and the workshop closed) until 18th
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The last reply was more than 365 days ago, this thread is most likely obsolete. It is recommended to create a new thread instead.