Thanks for the suggestions, i will try that and let everyone know. Thanks again!
> On Oct 12, 2018, at 11:57 AM, Fugu ME100 <b4me...@hotmail.com> wrote: > > Hi > > The voltages look good. I usually replace C86 too it is part of the -5V > output circuit. > > You could try measuring the contrast voltage on the connector, pin 4, see > if it smoothly transitions and there are no “jumps". Also check the -5V > is stable as you vary the contrast. I have noticed on some screens that > are failing the -5V will drop to -2V as the screen draws too much current > as the contrast is varied. > > If the contrast voltage is not a smooth change then you could try Brian’s > suggestion to clean VR1. > > Is it always missing a few lines on the screen? Do the missing lines have > a pattern? > > On 12/10/18, 2:35 AM, "M100 on behalf of Rafael Arena" > <m100-boun...@lists.bitchin100.com on behalf of minikni...@hotmail.com> > wrote: > >> Hi, >> >> At times the computer comes on and when adjusting the screen display the >> image gets all distorted and then fades away. I have checked the +5 and >> -5 volts that the screen needs and I get +5 and -4.8 volts respectively. >> I changed capaciitor ‘C85’ and checked all the memory chips. Like I said >> it works every now and again, missing a few lines on the screen. When i >> play with the contrast knob the image distorts and some times fades away. >> Any of this makes sense? Lol >> >> Thank you, >> >>> On Oct 11, 2018, at 10:27 PM, Fugu ME100 <b4me...@hotmail.com> wrote: >>> >>> Hi >>> >>> What are the symptoms you are experiencing? >>> >>> VR1 could go bad but it could also be due to oxidation on the resistors >>> tracks. People have tried to use contact cleaner to revive them. Might >>> be worth looking into trying that option first? >>> >>> >>> On 11/10/18, 3:57 PM, "M100 on behalf of Rafael Arena" >>> <m100-boun...@lists.bitchin100.com on behalf of minikni...@hotmail.com> >>> wrote: >>> >>>> Hello, >>>> >>>> I have a semi functional Model 100. I believe the issue is with the >>>> variable resistor ŒVR1¹. Where can I get a replacement? Do those VR¹s >>>> typically go bad? >>>> >>>> Thank you, >>> >>> > >
