冠捷系列機(jī)器維修案例

1、廣州分公司向易澤廣州分公司向易澤2007-08 機(jī)型：LCD37K72 故障現(xiàn)象：無聲音 檢修過程：通電開機(jī)發(fā)現(xiàn)有圖像無聲音，首先檢查伴音制式無誤后，測功放供電為18V正常。用示波器測U503（MAX9704）功放輸入波形（10、16腳）正常，檢查功放靜音控制腳為低電壓，說明靜音起控，查Q502時C、E腳已短路。更換零件后故障排除。 維修總結(jié)：此機(jī)型極易出現(xiàn)無聲故障，多數(shù)為功放供電開關(guān)管Q701（AO4403)不良,Q701為場效應(yīng)管,主要控制18V向MAX9704供電,常見故障是源極與柵極擊穿,兩極電阻為300歐姆左右,導(dǎo)致功放供電只有5V左右.如現(xiàn)場無AO4403，也可以把此場效應(yīng)管去掉用

2、導(dǎo)線接通18V備用應(yīng)急。也有一小部分無伴音是因?yàn)楣Ψ臮503（MAX9704）假焊造成。機(jī)型：LCD37K72故障現(xiàn)象：不開機(jī)(燈不亮)檢修過程:從故障現(xiàn)象看是無5V輸出,先檢查F1,BD901,D901發(fā)現(xiàn)只有F1損壞,此機(jī)5V為LD7575控制輸出,檢查IC905和Q900，發(fā)現(xiàn)這兩個元件均損壞,又量了IC905周圍元件沒發(fā)現(xiàn)有異常,懷疑負(fù)載有問題,對 D924,D921,IC911,SCR901,IC904,IC912進(jìn)行測量發(fā)現(xiàn)IC911和SCR901已損壞,把這些損壞的元件全部進(jìn)行更換再檢測無問題后開機(jī),5V輸出正常,故障解決.維修總結(jié):此故障在這種機(jī)型中很常見,更換壞件時需全部進(jìn)行

3、更換檢測,否則又會燒壞.另外此電源部分的Q914很容易損壞,此三極管控制VCC1向VCC2(PFCIC5500)供電的,當(dāng)主板產(chǎn)生的PS信號后,此三極管導(dǎo)通,此三極管經(jīng)常軟擊穿,造成輸出24V輸出波動.R94947 1/4WR9561K 1/8WR91047+C938100uF/50VC9040.047UFD902FMX-G26SR900447 1/4WR9703K 1/8W+C947470uF/25VCN9031234567891011121314R960NCC9281uFD936FR103+C9812200uF/35VQ971STP20NM50/FP213D977LL4148+5VR953

4、47 1/4WR901951K 1/8WL90310mH1243D973LL4148+C93710uF/50V+C9822200uF/35VVCCL9313.5uH+24VR946470 1/8WIC931LD7522PS12345678BNOCOMP(-)LATCHCSGNDOUTVCCOVPR9180.15 3WR9885.1K 1/4WR905NCC9481000PFC971220pFR9341K 1/8WR98333 1/8WC9841uFNR901NTCR+C9461000uF/25VR900747 1/4WC9531uFQ904KTB1124BD960SSM54PTD932FR10

5、3C914NCC9941000PFR9112.2R9732M 1/4WR90101M 1% 1/4WD9791N4148C9171000pFC9961uFR94747 1/4WR98133 1/8W+12VR900247 1/4WC9730.1uF/50VC909470pF/250VR9942.7K 1/8WR920470 1/4WR90201K 1/8WR9852.0KR9981K 1/8WR91210 1/8WC9290.001uFR900951 1/4WC908470pF/250VC9765600PFR9190.15 3W+5VR900347 1/4WQ972STP20NM50/FP21

6、3+C952470uF/16VR9896.2K 1/8WC9330.01uFIC973AZ431AZ-AE1C9780.1uF/50VD937BA159GPTR9742MQ905PMBS3904VCCR984100K 1/8WQ9732N3904S-RTK/PSR95833K 1/8WR97610KR997150K 1/4WR9251M 1/4WCN901CONN123R9241.5M 1/4WR900647 1/4WR982100K 1/8WR90163K 1/8WR96820K 1/8WC9951000PFCN902CONN123456789101112Q932KTD1691R95447

7、1/4WZD932RLZ15B12D904LL4148R91522 1/8WC9071uF/450VR9710.1 ohm+C97510uF/50VR9931K 1/8WR94010K 1/8WR9612.4K 1/8W-+BD901D10XB602134D978LL4148R9014150K 1% 1/8WC9410.1uF/50VIC972PC123X8YFZOF1243R90111M 1% 1/4WQ931FQPF7N65CC940NCC9740.0047uFC926NAQ9332N3904S-RTK/PSIC971L6599D12345678910111213141516CssDELA

8、YCFRFminSTBYISENLINEDIS PFC_STOPGNDLVGVccN.C.OUTHVGVBOOTC9110.1uFC990NAR9860.68 3WC9800.027uF/1000VR966100K 1/4W24V1C9390.0022uF/1KVR99910K 1/8WR93922 1/8WR9641M 1/8WR900847 1/4WR95247 1/4WR900547 1/4WR95047 1/4WC9970.1uF/50VIC932PC123X8YFZOF1243R92239K 1/8WR901330K 1/4WC9341000pFR978510K 1/8WR9621K

9、 1/8WC9433300PF/50V+C9501000uF/16VR9261M 1/4WR97518K 1/8WC9921000PFL96020uHC9870.1uF/50VIC934PC123X8YFZOF1243R94847 1/4WC9100.01uF/500VR908220K 1/8WR96310K 1/8WD950FME-210B123Q902STW20NM60213R95710K 1/8W+C93247uF/50VE377CZNK2WAEN2GBMHCustom22Tuesday, April 17, 2007715T2512-202.POWERT2512-1-X-X-3-070

10、417OEM MODELSizeRevDateSheetofTPV MODELPCB NAME稱爹T P V ( Top Victory Electronics Co . , Ltd. )Key Component絬 隔 瓜 絪 腹+C9831000uF/35V+C918100uF 450V+C91247uF/50VC9931000PFD975FME-220A123R90214.7K 1/8WR90121M 1% 1/4W+C954470uF/25VC9061uFF9020 1/4WC9010.047UFQ903KTD1624C+C99810uF/50VC91356pF+24VR9911K 1

11、/8WD976FME-220A123R90180 1/4WR900147 1/4WC9301500PF/50VR9593.6K 1/8W+C922470uF/35V+C919100uF 450VIC960TPS40200DR12345678RCSSCOMPFBGNDGDRVISNSVDDR9424.7 1/4WR92351K 1/8WC9150.047uF24V24VR97727K 1/8WR91610K 1/8W+12VD971LL4148C9453300PF/50VD972LL4148T931POWER XFMR12356789101112R91410 1/8WL9713.0uH +-10

12、%L901L1243R995150K 1/4WR91710K 1/8WZD931PTZ9.1B12R996150K 1/4WC9770.1uF/50VC9310.1uFC9720.22uF/25VR965100K 1/8WD951FME-220A123C9860.1uF/50VR955470 1/4WD903LL4148Q960AO441112348765SSSGDDDDR9903.3K 1/8WR96722 1/4WC9270.0047uFR90915K 1/8WR906NCC9443300PF/50VCN9041234567891011121314R904NCC9160.33uFZD933

13、RLZ27B12C9050.0022uF/250VVCCT971POWER XFMR67891011131434C9990.01uFR99224K 1/8WPS OND974LL4148R90756K 1/8WIC901FAN7529MX12345678INVCOMPMOTCSZCDGNDOUTVCCR91322 1/8WR9310.1 ohmR9013240K 1% 1/8WRV90156012C923470pF/50VD931LL4148R902330K 1/4WF901FUSEL906168uH12121156C9421uFR9450.47 2W24V1R902222 1/8WQ901S

14、TW20NM60213C9790.1uF/50VR941100K 2WR90173K 1/8WC9240.47uF/25V+C9511000uF/16VL90210mH1243+15VR901562K/0805R9722M 1/4WR95147 1/4WC9491000PFR9270 1/4WZD934RLZ18B12IC933AZ431AZ-AE1R903330K 1/4WR979100C935100n/0805R9875.1K 1/4WC9210.1uFR9803.9K+15VR92110K 1/8WL9323.5uH+C920100uF 450VR96962K 1/8WPS ON 機(jī)型機(jī)

15、型:LCD42E75 故障故障1:不開機(jī)不開機(jī)(燈不亮燈不亮)不加電NG重插接口OK檢查 F901, BD901, D902NG更換 F901或者 BD901或者D902OKCheck the load檢查IC931, Q931 ，Q932 (VCC)NG更換IC931或者Q931或者Q932OK檢測IC901，Q903，Q904NG更換IC901或者Q903或者Q904OK檢查T931NG更換T931OK檢查D950, D951，ZD931更換D950, D951， ZD931NG檢測電源接口OK檢查L931，L932更換L931，L932NG機(jī)型機(jī)型:LCD42E75 故障故障2:無顯示無

16、顯示 (LED 綠色綠色)檢查信號源OK重接信號源NG檢查LVDSNG更換LVDSOK檢查24V 供電NG檢測IC971，Q971，Q972OKOK檢查U305NG更換U305OKOK檢查panelNG更換 panel檢查主板供電檢查 I2C 通信NG更換IC971，Q971，Q972OK檢測T971NG更換T971OK檢測D975，D976NG更換D975，D976OK檢查 U300NG更換U300 機(jī)型機(jī)型:LCD42E75 故障故障3: 無顯示無顯示(燈橙色燈橙色)換按鍵板檢查主板Standby供電更換U702，U703，U700，U704，U705，U706檢查 Power_on 信號檢查 按鍵板換 I2C 通信元件無畫OKOKNGNG更換Q702，Q703，Q707檢查U305NG更換U305OK檢查 I2C 通信OK檢查 U300NG更換U300NGOKNG機(jī)型:LCD32K72故障:無24伏輸出(下面 寄上來修的電源