If you don’t have access to some ESR meter measurement system, try to replace the capacitors, otherwise it will cost you time and effort.
By the other hand, in order to help you, we need more info, so provide us additional information regarding measurement voltages in the circuit, this cover power supplies section, RGB circuit, CRT tube, vertical IC, etc.
It's difficult to see from your photograph but it looks like the whole picture has a green tint. This points to a fault in the green video output stage which also would account for the blanking problem.
If you can display a plain raster or failing that a channel with nothing on it, check the voltages at the collector pins of Q851, Q852 and Q853 on the tube base, they should be roughly the same.
Brian.
It's difficult to see from your photograph but it looks like the whole picture has a green tint. This points to a fault in the green video output stage which also would account for the blanking problem.
If you can display a plain raster or failing that a channel with nothing on it, check the voltages at the collector pins of Q851, Q852 and Q853 on the tube base, they should be roughly the same.
Brian.
That is quite normal, all you are doing is turning the whole screen brightness up and down. The fault is in the circuit that shuts the brightness down ONLY during the blanking period.
Check these components: D758 & R760, probably close to the flyback transformer.
D501 through D505 near IC201 and also confirm the voltages on Q503 are as they are marked on the schematic.
Brian.
If 180v+ is good with 22uf 250v and screen shows green Retrace lines than you need to do.
1.CRT base Problem
2.Open Resistor 10k/1W on Green output Transistor
3.Green output Transistor become Leaky (Replace it)
---------- Post added at 23:23 ---------- Previous post was at 23:22 ----------
If 180v+ is good with 22uf 250v and screen shows green Retrace lines than you need to do.
1.CRT base Problem
2.Open Resistor 10k/1W on Green output Transistor
3.Green output Transistor become Leaky (Replace it)
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