![]() ![]() #ICIRCUIT RESIZE TV#When the power control circuit or power supply Board of the TV system during the self-test, PS-ON control signal is converted to a low level, Q14 (IRFU9120) electronic switch breakover, IC8 (KA7818) the VC-S-R voltage regulator get 17V, and then by the Q11 (IRFU9120) voltage regulator be VC-S-F voltage of about 12V. Internal earth terminal MOS tube 3 feet and over current protection ![]() (ICE2A280Z) is a switching power supply control IC with MOS pipes, pins of its main functions are as follows:ġ foot is decoupled (filtering) foot, capacitor Ģ feet is regulated, and foot protection and control VC-S-F voltage provided to Q13 (C2383), R元S relays controlled 220V AC input voltage to rectifier-filter circuits are controlled. VC-S-F voltage provided to the IC35 (KA1M0880B) to provide the operating voltage. ![]() IC8 (KA7818) the VC-S-R voltage regulator get 18V and then by Q11 (IRFU9120) VC-S-F voltage switches to get around 17V. Q14 (IRFU9120) electronic switch PS-ON off and signal control, but PS-ON for low level light OU PC9 (TLP421) light emitting diode conduction within the subprime phototransistor breakover, Q14 (IRFU9120) electronic switch breakover, take the D25 (BYV38), Rectifier, C38 (50V/ 47uF) filter is getting voltage Q14 (IRFU9120) send electronic switch to IC8 (KA7818) IC8 (KA7818) the VC-S-R voltage regulator get 18V, the output to the IC7 (KA1M0880B), IC31 (KA317) circuit, IC7 (KA1M0880B), IC31 (KA317) operating voltage (see Figure 1). (BCK50-T3SDI) 5-foot, 8-foot winding output ripple voltage, the D25 (BYV38), Rectifier, C38 (50V/47uF) filter is getting voltage, voltage output as VCC-S on the one hand, on the other hand sent to Q14 (IRFU9120) electronic switching. VR2 (1K) and IC6 (KA431AZ), OU PC3S (TLP421), and IC2 (ICE2A280Z) 2nd leg form the STB and 5V voltage regulator circuit, adjust VR2 size STB 5V voltage can be adjusted. But T3S (BCK50-T3SDI) of the induced voltage between 3 foot, 4 foot, take the D27 (BYV38), Rectifier, C50 (50V/47uF) filter into IC2 (ICE2A280Z) of 7 feet, to take the IC2 (ICE2A280Z) to provide normal power supply, STB 5V power supply was working properly. Exchange electric into power Board component Shi, after anti-waves Chung circuit, filter except bad of miscellaneous spread interference Hou, directly sent to has BD2 (G3SBA60), and C100 (450V/22uF) composition of Deputy power rectifier filtering circuit, produced near 300V of pulsating DC voltage, into STB 5V switch transformer T3S (BCK50-T3SDI) of 1 feet, and 2 feet winding, again to IC2 (ICE2A280Z) of 5 feet C100 (450V/ 22uF) 300V pulsating DC voltage on the anode, and R67 (180K/1W), R68 (180K/1W) started two resistors, IC2 (ICE2A280Z) to provide initial power to the 7 foot, IC2 (ICE2A280Z) began to work the T3S (BCK50-T3SDI) each of windings is induced voltages 10 pin and 7-foot winding induced voltages produced by by the D28 (D2S6M) rectifier C39 (10V/2200uF) filter and then through L6 (7uH), C40 (50V/47uF), п-shaped filter consisting of obtaining stable 5V DC voltage that STB 5V voltage. ![]()
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