Composite of machine not working. First I though it was the CXA1145 video encoder, because all signal where present, but no composite output. The voltage of the CHROMA_OUT was very low. So the question.. what is causing this? I replaced all small components (resistors & capacitors) between CHROMA_OUT (CXA1145 pin 15) and CHROMA_IN (CXA1145 pin […]
Received an Amiga 1200 to fix. Someone tried to do a recap on this machine but failed, pads are gone, some are loose, plastic melted.. not a very good job.. Beside those issues the “repairman” sprayed the board with “Flux SK10”.. why ?! The whole board is sticky.. The keyboard fpc top cap even […]
Black screen on RGB output can be a broken E263R Ferrite Bead (FB200). Monitor won’t get into RGB mode if there is no 5V on pin 23. I have seen several Ferrite Beads that were broken, and have a much higher resistance (impedance). After replacement 5V is restored and we have RGB signal again.
Amiga 1200 – E-matrix 1230-50MHz Got an E-Matrix 1230-50MHz for repair. Owner tried to replace Oscillator, but that didn’t end up well.. ? Problems found 2 broken traces Dead Oscillator 50MHz Not working SIMM RAM module Fixes Fixed traces with jump wires Replaced Oscillator Used own 8MB SIMM to test card
Got an Amiga 1200 for repair, which didn’t boot. Only red screen on composite, on RGB nothing. Owner said there was a problem with kickstart 3.1, but diagrom dropped garbage.. Output on composite: Checked all data/addreslines from rom sockets, all where good and clocks are detected.. Did a reflow, on Alice, Budgie, cpu, chipram and […]