1、5-1ENERGY RECOVERY CIRCUIT(能量回收电路)C(PANEL屏幕)S1L1/2 VoVoS2S3Vo1/2VoS1S2S3ONONONON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,Q6626DISCHARGE(放电)CHARGE(充电)S2 S3 Q6601,Q6602,Q6603,Q6604 Q6605,Q6606,Q6607,Q6608 L L6611,L6612,L6613,
2、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,Q6726DISCHARGE(放电)CHARGE(充电)S2 S3 Q6701,Q6702,Q6703,Q6704 Q6705,Q6706,Q6707,Q6708 L L6711,L67
3、12,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 SIGNALSCAN DRIVE SIGNALSUSTAIN DRIVE SIGNALAddress Pulseex:150 line+5-5-1 SCAN SIGNALVSETSCAN PULSEon SU/SDSCAN GROUNDSUSTAIN PULSEVSET BASE(vsus)+=
4、VSCANVBKVADSET UPSC5-5-2 SC boardVSUS1/2 V0ENERGY RECOVERY CIRCUITS2S3S1 CHARGES1 DISCHARGE LVBKBKVADGEN.VSET2GEN.VSETREGURATORVSCNGENELATORVSUS15VSC OUT(VF0)SC GND(VF)Q6520-Q6521Q6511Q6512Q6551Q6552Q6553Q6555Q6522-Q6527Q6542-Q6547Q6641,42Q6601Q6602Q6605Q6606Q6621Q6624175V28V-90V155V175VCSHCSLCMHCML
5、CPHn-CPHCELCBKN-CELSCSUN-CECECMHCMLCBKCPHCPHCSHCSLVset 218VVsus170VVbk155VCELCELSCSCVad 90VSCSUM/IM/IIC6401IC6404IC6405IC6408Vscn28V VsetVsusVbkVadCMHCPHCELCMLCSHCSLCBKCPHCELSCSCSCSUVfVfo5-5-3 SC boardS1S2S3480 linesSD Models5-5-4 SUSTAIN SIGNALVESUSTAIN PULSEVE2SS5-5-5 SS boardVSUS1/2 V0ENERGY RECO
6、VERY CIRCUITS2S3S1 CHARGES1 DISCHARGE LVEREGULATORVSUSVE(5V)SS OUTQ6745Q6746C6747Q6741Q6742 +-158VUMHQ6724Q6721Q6701Q6702Q6705Q6706175V175VUMLUSHUSLUEHn-VELVELSUSTAIN PULSEUEHUELUELUMLUMHUSHUSLVE158VVE2155V Vsus170VUELUELUEHUMLUMHUSHUSLSustainVsus 170VVe2 VVe158V5-5-6 SS board42”/37”SD/42”HD5-6-1 SC
7、AN PULSE OUTPUT(SU&SD Board)240 PULSES240 PULSES7610075741VfVf0SHIFT RESISTOR SCAN PULSE OUT IC x 4 x 2SUSD 240 PULSES240 PULSESIC6401IC6404IC6405IC6408Upper side48BIT+64BIT3Address PulseFCLKFCLFSIPRO148064BIT3+48BITBottom sideFCLKFCLFSI480PulsesABFrom PRO PulseFrom BFrom BFrom VfVfo5-6-2 SCAN PULSE
8、 OUTPUT Address Pulse(SU&SD Board)SUSSD Models5-6-3 SCAN PULSE OUTPUT(SU&SD Board)64Q640176100918599S.R.76100918599S.R.76 159185S.R.166448761009185S.R.9964SUSD1ST4TH2ND3RD6476100918599S.R.FSIFSISD板:IC6405-64线IC6406-64线IC6407-64线IC6408-48线SU板:IC6401-48线IC6402-64线IC6403-64线IC6404-64线5-8-1 故障检测 SC板主要电压
9、和驱动波形:Vsus=170VVbk=155VVset=218VVscn=30VVad=-90VSS板主要电压和驱动波形:Vsus=170VVe=150VVda=67VSC/SS板电压与图像变化情况电压电压调节范围调节范围变化情况变化情况Vad Vad 90V 90V-163-163V V -70V -70V低于低于139139V V出现篮黑点出现篮黑点Vsus Vsus 180V 180V159159V V 204V 204V低于低于165165V V图像变暗图像变暗Ve Ve 150V 150V9191V V 172V 172V低于低于130130V V出现蓝点出现蓝点低于低于110110
10、V V出现深蓝点出现深蓝点低于低于102102V V出现黑点出现黑点5-8-2 故障检测 1)发光二极管LED电源定时闪亮两次取下连接SC20(50寸 SC21)NG取下连接SS23NG开电源,看LED(50寸 SS32)接SC20 OKOK取下SU板 OK SU板 SS板顺序取下各C板接SC20接SS23 NG取下SD板 OK SD板接SU板 NG SC板(注意)在取下连接器或板子的情况下,不能长时间地开电源.2)异常图像(并且横线异常)查看维持脉冲的波形 OK NG NG NG SS板取下SU板取下SD板接SU板 OK OKSU板SD板查看扫描脉冲的波形NG SC板主要故障现象:保护,指示
11、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。