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SMS Tec-Toy (Brazil) Video Problem (help)
Posted: Sun Feb 05, 2017 2:53 am
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Hello guys, my SMS is having some sort of saturation problem and i don't know what component could be faulty.
I use an AV cable and this fault started after a few minutes playing, but now its there all the time. Pictures atached. |
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Posted: Sun Feb 05, 2017 2:57 pm |
Try replacing electrolytic capacitor C46 on video line. If your TV has S-Video input you can try improve picture quality adding a S-Video output. And if you don´t use RF there is an issue caused by original circuit which cause some interference in picture which can be fixed removing just one resistor (R36). http://esraelneto.com.br/hardware/sms_tt_s-video_v2a.php |
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Posted: Mon Feb 06, 2017 11:46 pm |
Thank you neto, it fixed!
But since my CRT TV broke, the image is horrible in my LCD using the AV cable... Is there anything i can get to have a fairer image quality without doing the S-video mod? I don't even own a S-video TV anymore. |
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Posted: Tue Feb 07, 2017 2:47 am |
The other mods require a RGB monitor http://esraelneto.com.br/hardware/sms_tt_rgb.php Or If you want to improve composite video quality changing video encoder from MC1377P to CXA1645P http://esraelneto.com.br/hardware/sms_tt_cxa1645.php |
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Posted: Fri Feb 10, 2017 1:16 am |
Well my SMS is not fixed..
After about 10 minutes playing the screen starts to blink/flash to and from the weird colors of the pictures. What else could it be? |
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Posted: Sat Feb 11, 2017 12:48 am |
Check the variable resistor VR101 (100K) and ceramic capacitor C31 (100nF) near the video encoder MC1377P. |
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