Hi have this set sound ok, video working, the problem is blank screen .I got the service manual .the voltage of one of the pins on the large transisters on the tube base is missing a 2.0voltage which drives these transisters checked back and found that there is 7.0 volts on R303 which goes back to a surface mounted 100 leg mircochip which costs 80pound Iam wondering maybe the fault is not this chip.can you give me any advice.many thanks dave .
