In the CRT sets, not only Sony, there are many types of failures that can cause a loss of a colour channel.
- damaged or warn parts on the CRT circuit board that are associated to the related colour channel(s).
- The CRT itself may be failing.
- Defective interface socket on the CRT circuit board, or a cold solder connection under the connector or on the the CRT board, or along the path of the related video colour channel.
- Intermittant loss or complete loss of the bias voltage supply for the CRT that drives the colour channel in question due to any failing parts, or some cold solder connections.
- The CRT itself is going defective and thus failinig.
- Cold solder connection(s) on the circuit board.
To find this type of fault it would take an experienced technician using the appropiate test instruments to make the necessary tests.
Considering the cost for the time and the necessary parts (if obtainable for an old set), you may find the set too exensive to have serviced.
Jerry G.
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