According to the failure phenomenon, combined with maintenance experience, judge fault lies in a tube or put in the circuit. Based on the principle of easy after the first difficult, first three cathode voltage of the measuring tube, found that G cathode voltage ratio R, B is definitely too high. Then measure IC102 three outputs, R (1) feet, G, B (3) (3) the feet are: 42 V, 38.1 V, 41.1 V, obviously G gun high voltage (sees attached figure) associated circuits. Measurements were successively IC102 the input voltage of R, G, B, found that G is low. Due to the signal input signal output from IC101 IC102 feet, so the measurement lCl01 G output 24 feet, 2.2 V, also on the low side. 24, 25 feet and routine inspection IC101 IC102 pet-name ruby feet between components, found no abnormalities, so doubt IC101 damage, but after substitution KA2506 fault remains. Because the G signal is put in apparent channels of voltage and the differences of R and B, can eliminate tube aging phenomenon, at the same time think dark balance adjustment circuit is normal. Failure should be bright balance disorders. QvMservice manual download site
 QvMservice manual download site
 QvMservice manual download site
Considering the native white balance adjustment circuit adopts the bus control method, therefore can only adjust or rewrite the data into the bus. Because there is no samsung monitors maintenance of tooling equipment, unable to adjust the state of the bus, so the rewrite data. Everything is ok after installed. Troubleshooting.QvMservice manual download site