There is no black current correction function of the TV black screen fault repair easier, because the audio circuit without feedback signalHQdservice manual download site
Into the RGB primary color signal processing circuit. Like this high-definition television in the brand TV are there, such as ChanghongHQdservice manual download site
CHD-10 movement, the digital chip using the HTV191 chip, the lC generated R, G, B signal and the line field synchronization signal intoHQdservice manual download site
Motherboard TB1307NG, R, G, B signal into TB1307 ④ ~ ⑥ feet, TB1307 after treatment, from (33),HQdservice manual download site
(35), (37) pin output to TDA6111 for video zoom. TB1307 has a black current detection function, but in ChanghongHQdservice manual download site
CH10 movement is not used. TB1307 do not use the black current detection function (40) feet IKIN connected to (32) feet power supply feetHQdservice manual download site
on.HQdservice manual download site
No black current detection function of the TV screen black screen failure, troubleshooting methods and ordinary CRT TV black screen failureHQdservice manual download site
Overhaul the same. On the cathode voltage of the black screen failure, just measure the R, G, B-based color signal processing circuit output voltage that isHQdservice manual download site
Can determine the fault range. Of course, the maintenance by TB1307 this is not subject to black current control R, G, B-based color signal processingHQdservice manual download site
Circuit, also need to know those feet affect the R, G, B processing circuit working status. Such as TB1307NG (41) feet ABL,HQdservice manual download site
(13), (32), (41) feet 9V power supply and ④, ⑤, ⑥ feet and so on.HQdservice manual download site
Due to failure of the inverter circuit will cause a black screen, therefore, there is no black current correction function of the TV appears blackHQdservice manual download site
Screen failure, but also need to determine the frequency of the circuit operating status. The operation method is: TB1307, for example, on the frequencyHQdservice manual download site
Circuit to TB1307 the R, G, B signal measurement, respectively, to measure the signal and no signal when the voltage changes, such asHQdservice manual download site
Measuring the TB1307 ④, ⑤, ⑥ feet (R, G, B signal input feet) external capacitor voltage, a voltage change that digitalHQdservice manual download site
Frequency conversion circuit has been working, otherwise check the digital frequency conversion circuit. When the confirmation image signal has been sent to TB1307, then check the power and lineHQdservice manual download site
Reverse pulse, ABL automatic control circuit. Line reverse pulse of the reason why the impact of RGB output, because ④, ⑤, ⑥ feetHQdservice manual download site
R, G, B input to be black level recovery, so as long as the TV using the TB1307, just check the above feet outside the circuit andHQdservice manual download site
Replace this IC to troubleshoot. And TB1307 this R, G, B-based color signal processing work is similar to the wayHQdservice manual download site
TB1307FG, TB1316 and so on.HQdservice manual download site