So my ex managed to knock this unit off a 4 ft shelf and it apparently landed face down. Screen is fine but as soon as it's plugged in you can hear it click but no picture appears.
The power light (red) flashes 4 times. You cannot shut the unit off with the power button, you have to pull the plug.
Some brief googling looks like 4 blinks is No vertical Deflection (V STOP).
Anyone with this unit (or similar) able to offer some guidance as to what I'm looking for?
And in case I ever get this operational again, which dial (pictured) is focus and which is voltage?
Given that it suffered a drop, the most likely cause is a cracked PCB. Fortunately, this is physical damage that can be spotted visually and often can be repaired without having to figure out what's wrong with the circuit itself. Your first step should be to look for cracks and patch any broken traces that you find.
The 4 blink problem indicates a lack of vertical deflection. But, because the vertical IC is powered by a scan derived voltage there's a whole chain of problems that could be responsible including horizontal deflection failure, insufficient B+, etc. Those circuits are especially vulnerable to physical damage because they involve large components like the flyback and other transformers that put stress on the board.
Thanks for the response! I'll dust off the board and look for cracks. It seems like anything beyond that will take a lot of troublshooting that is likely beyond my abilities. It also wasn't my favourite set and I should probably trim my collection some anyway.
matt wrote:Given that it suffered a drop, the most likely cause is a cracked PCB. Fortunately, this is physical damage that can be spotted visually and often can be repaired without having to figure out what's wrong with the circuit itself. Your first step should be to look for cracks and patch any broken traces that you find.
The 4 blink problem indicates a lack of vertical deflection. But, because the vertical IC is powered by a scan derived voltage there's a whole chain of problems that could be responsible including horizontal deflection failure, insufficient B+, etc. Those circuits are especially vulnerable to physical damage because they involve large components like the flyback and other transformers that put stress on the board.
