Another ms2930 problem

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XeD
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Another ms2930 problem

Post by XeD » May 25th, 2017, 8:20 pm

Hey folks me again :D
I have a ms2930 that does not have any blue. Blue gun work, for sure. If I turn up the blue cut off the whole screen will turn blue. If I swap the red and blue wire going to neck board blue will show in the red location. If I swap the red blue from pcb to chassis I get nothing. From that I take it I have a problem somewhere in the main chassis. Adjusting the blue bias on the control board does not change much on the blue output of the M51387P IC. With red I can see it fluctuate.

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grantspain
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Re: Another ms2930 problem

Post by grantspain » May 25th, 2017, 8:39 pm

if you swap the red and blue wires to the neck card it will prove if the fault is neck card or colour decoder circuit

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nem
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Re: Another ms2930 problem

Post by nem » May 26th, 2017, 4:41 pm

XeD wrote:Adjusting the blue bias on the control board does not change much on the blue output of the M51387P IC. With red I can see it fluctuate.
You sure the pot for the blue gain is working OK? Have you tried a different control board?

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