[M100] FFC for LCD & Keyboard (M102)

Hello. I’m looking to replace the 18-pin and 30-pin flat-flex-cables in my Model 102, and was wondering if anyone can confirm the dot pitch. I did order some 1.0 mm dot pitch from DigiKey which don’t appear to be correct - the FFCs are too narrow: - 686618152001

Re: [M100] Troubleshooting M102 (Was: M102, Black Screen, Help!)

Hi, Apologies for delay in providing an update — seems work can get in the way of things sometimes. As of now, still no change in life of the little M102 - no home screen menu, no beep, contrast runs through full range from light to dark. LCD cable tested and retested. I have validated that ther

Re: [M100] Troubleshooting M102 (Was: M102, Black Screen, Help!)

lly nothing will happen on the board. Good luck. > > Cheers,Bert (not Jeff :-) > > > On 7/17/20 2:07 PM, perhaps...@gmail.com wrote: > > Hi Matt > > > > Thanks. I have found similar issue with the LCD cable on the ends, > > corrected and carefully reinserted

Re: [M100] Troubleshooting M102 (Was: M102, Black Screen, Help!)

connectivity all the way through. > > Matt > > > On Fri, Jul 17, 2020 at 2:15 PM perhaps...@gmail.com > wrote: > >> Thanks Jeff. I have revisited all the documented diagnostics in the >> service manual, and checked/re-checked all the voltages, reset circuit and >

[M100] Troubleshooting M102 (Was: M102, Black Screen, Help!)

ather than the repair of a specific computer. The > first video is about evaluation of the computer and getting yourself > started down the right path. > > > > https://www.youtube.com/playlist?list=PLegscpHOheJt_EpuPs9hfBpOJ5elRhYvw > > > > Jeff Birt > > > >

Re: [M100] M102, Black Screen, Help!

Thanks Jeff. On Fri, Jul 3, 2020 at 5:27 AM Jeffrey Birt wrote: > Have you done a hard reset? Ctrl+Break+Reset button. Have you checked > adjust the screen contrast pot? > > Yes, already done (multiple times) and contrast does adjust from light to all dark pixels. Forget to mention this in my li

[M100] M102, Black Screen, Help!

Hi - I am a new M102 owner, but have a collection of other TRS-80s (M1 & M4). I recently acquired this M102 on eBay, and as disclosed it has a "black screen" on startup. The following is what I have done so far, none of which has changed the situation. I would appreciate any and all additional gui