Hi to all,
I have an old osciloscope at first
he had 2 channels and working well all buttons but after see inside the circuit board was very bad and wanted to clean the circuit board .first i take off the Y -plate circuit board and cleaned it ,ialso take off the tantalium capacitors (1uf35v) to check if them are good ,the capacity was 1 uf on all and esr about 3.5ohm on them after i installed them not changed to new ones at the not previus placed but different but as schematic sayed them are insalled .when i put the Y-Board back ,nothing is working now from the buttons and trimpots just intence pot is workimg and i have the screen like this in photo.i checked for the power supply and i have all the voltages on power supply and transformer.i have checkd the transistirs onnboard x and y and z and no failure.in which block should i look for just some kind of problems?may i have some opem resistors maybe?