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1、TH-42PA20C 驱动电路分析,5-1ENERGY RECOVERY CIRCUIT（能量回收电路）,C(PANEL屏幕),S1,L,1/2 Vo,Vo,S2,S3,Vo,1/2Vo,S1,S2,S3,ON,ON,ON,ON,为了节约电能，用此电路,产生维持脉冲,5-2.ENERGY RECOVERY CIRCUIT for SC BOARD（能量回收电路-SC板）,CHASSIS（型号）,(42寸),S1,Q6621,Q6622,Q6623,Q6624,Q6625,Q6626,DISCHARGE（放电）,CHARGE（充电）,S2,S3,Q6601,Q6602,Q6603,Q6604,Q
2、6605,Q6606,Q6607,Q6608,L,L6611,L6612,L6613,L6614,L6615,L6616,C(1/2V0),C6621,C6622,C6623,C6624,C6625,C6626,V0,Vsus（维持电压）,CHECK LED（检测指示灯）,D6583（不亮则SC板有问题）,5-3.ENERGY RECOVERY CIRCUIT for SS BOARD（能量回收电路-SS板）,CHASSIS（型号）,42寸,S1,Q6721,Q6722,Q6723,Q6724,Q6725,Q6726,DISCHARGE（放电）,CHARGE（充电）,S2,S3,Q6701,Q
3、6702,Q6703,Q6704,Q6705,Q6706,Q6707,Q6708,L,L6711,L6712,L6713,L6714,L6715,L6716,C(1/2V0),C6721,C6722,C6723,C6724,C6725,C6726,C6727,C6728,C6729,C6730,V0,Vsus,CHECK LED（检测指示灯）,D6785(不亮则SS板有问题）,5-4 SCAN&SUSTAIN SIGNAL,SCAN DRIVE SIGNAL,SUSTAIN DRIVE SIGNAL,+,5-5-1 SCAN SIGNAL,VSET,SCAN PULSEon SU/SD,SCA
4、N GROUND,SUSTAIN PULSE,VSET BASE(vsus),+,=,VSCAN,VBK,VAD,SET UP,SC,5-5-2 SC board,VSUS,1/2 V0,ENERGY RECOVERY CIRCUIT,S2,S3,S1 CHARGE,S1 DISCHARGE,L,VBK,BK,VADGEN.,VSET2GEN.,VSETREGURATOR,VSCNGENELATOR,VSUS,15V,SC OUT(VF0),SC GND(VF),Q6520-Q6521,Q6511,Q6512,Q6551Q6552,Q6553Q6555,Q6522-Q6527,Q6542-Q6
5、547,Q6641,42,Q6601Q6602,Q6605Q6606,Q6621,Q6624,175V,28V,-90V,155V,175V,CSH,CSL,CMH,CML,CPH,n-CPH,CEL,CBK,N-CEL,SCSU,N-CE,CE,CMH,CML,CBK,CPH,CPH,CSH,CSL,Vset 218V,Vsus170V,Vbk155V,CEL,CEL,SC,SC,Vad 90V,SCSU,M/I,M/I,IC6401IC6404IC6405IC6408,Vscn28V,Vset,Vsus,Vbk,Vad,CMH,CPH,CEL,CML,CSH,CSL,CBK,SC,Vf,V
6、fo,5-5-3 SC board,S1,S2,S3,480 lines,SD Models,5-5-4 SUSTAIN SIGNAL,VE,SUSTAIN PULSE,VE2,SS,5-5-5 SS board,VSUS,1/2 V0,ENERGY RECOVERY CIRCUIT,S2,S3,S1 CHARGE,S1 DISCHARGE,L,VEREGULATOR,VSUS,VE(5V),SS OUT,Q6745,Q6746,C6747,Q6741Q6742,+,-,158V,UMH,Q6724,Q6721,Q6701Q6702,Q6705Q6706,175V,175V,UML,USH,U
7、SL,UEH,n-VEL,VEL,SUSTAIN PULSE,UEH,UEL,UEL,UML,UMH,USH,USL,VE158V,VE2155V,Vsus170V,5-5-6 SS board,42”/37”SD/42”HD,5-6-1 SCAN PULSE OUTPUT(SU&SD Board),240 PULSES,240 PULSES,SHIFT RESISTOR,SCAN PULSE OUT IC,x 4 x 2,SU,SD,240 PULSES,240 PULSES,IC6401IC6404IC6405IC6408,Upper side48BIT+64BIT3,Address Pu
8、lse,FCLK,FCL,FSI,PRO,1480,64BIT3+48BITBottom side,FCLK,FCL,FSI,480Pulses,A,B,From PRO Pulse,From B,From B,From,Vf,Vfo,5-6-2 SCAN PULSE OUTPUT Address Pulse(SU&SD Board),SUS,SD Models,5-6-3 SCAN PULSE OUTPUT(SU&SD Board),SD板：IC6405-64线IC6406-64线IC6407-64线IC6408-48线,SU板：IC6401-48线IC6402-64线IC6403-64线I
9、C6404-64线,5-8-1 故障检测,SC板主要电压和驱动波形：Vsus=170VVbk=155VVset=218VVscn=30VVad=-90V,SS板主要电压和驱动波形：Vsus=170VVe=150VVda=67V,SC/SS板电压与图像变化情况,5-8-2 故障检测,主要故障现象：保护，指示灯闪烁2次。图像负像或有斑点图像水平拉丝图像水平一条线或宽带,5-8-3 修理实例,故障现象：保护，指示灯闪烁2次。,分析：指示灯闪烁2次，通过前面讲述的修理流程，判断是SC板。在SC板上有5路保护，输出2路保护信号。D6584是1/2V0的保护控制。D6468是VF0的保护控制。D6459是VF的保护控制。D6470是VSCN的保护控制。D6480是VAD的保护控制。,检修经过：开机测量D6584、D6468、D6459、D6470、D6479正端的瞬间电压。检测D6479时发现正端瞬间有电压变化。估计是VAD电压异常造成保护。测量VAD发生器Q6471、D6474、T6471、IC6471，发现IC6471异常。更换IC6471，故障解除。,特别提示：对于VAD和VSCN引起的保护，我们可以仅仅提供15V电源来进行修理。,
