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for tv sony or japanese brand tv even us or european suffering weak emission of picture tube can increase a little but good picture .................procedure
1st step measure the heater voltage
2nd step increase heater voltage by 1.5 volts to 2 volts if possible
how ........................ try to wined insulated solid wire to the ferrite of the flyback aproximately3 to 5 turns depends on how much voltage u are applying at the heater of the picture tube try to measure it accurately cause over voltage can burn out the heater of the picture tube
3rd disconnect the existing heater voltage wire to the picture tube
4rth connect the two leads of ur new heater voltage to the heater pf the picture tube ...............................it take a skill and accurate measurement to do this this can only be use as a last result don try it on newly both tv or not exceeding 5 years use .............................bye i hope many technician can benefit on this nevt week ill going to post new tips ty