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405-1*BM
無(wú)法預(yù)測(cè)需要挑開(kāi)多少片IC后，才能找到故障IC。CPU主板元件焊接的“精致程度”已艱接近于手機(jī)的線路板，IC電路全為貼片元件，將IC引腳的銅箔條說(shuō)成比頭發(fā)絲還細(xì)，甚至于都不算是夸張。手底一不小心，挑掉銅箔條的話，想接起來(lái)都比較困難，挨片挑，這個(gè)法子也太笨了。
由于變頻器的開(kāi)關(guān)電源本身負(fù)載能力有限，接于故障電路時(shí)會(huì)引發(fā)過(guò)流保護(hù)，使開(kāi)關(guān)電源停止輸出。故采用外接容量較大的+5V電源，串接5Ω5W限流電阻接到CPU主板上，通電幾分鐘后，用手觸摸CPU主板上的IC芯片，哪片燙手，有異常溫升，即是哪片IC已經(jīng)壞掉了。
這個(gè)法還真靈，挑開(kāi)兩片有異常溫升的IC供電引腳，測(cè)其引腳電阻，均在十幾Ω左右。此時(shí)再測(cè)+5V電源輸出端，已經(jīng)是數(shù)百Ω的正常阻值了。
這是個(gè)好法子，算是將錯(cuò)就錯(cuò)或?qū)⒂?jì)就計(jì)或順勢(shì)而為，利用外接+5V供電，既對(duì)好的IC沒(méi)什么危害，又使壞IC持續(xù)升溫，暴露在我手指的“測(cè)溫儀”下。特別適宜于檢測(cè)CPU主板上出現(xiàn)的IC短路故障。
Cisco Aironet 1200 Wireless AP AIR-AP1231G-A-K?9
LOF of 5: Cisco Systems 30-0759-01 1000 BASE-SX 850nm Module
Cisco Catalyst WS-C3508G-XL-EN 8-Ports External Switch
LOT of 4: Cisco Systems GigaStack GBIC, WS-X3500-XL, No Plastic Cover
Cisco Catalyst 6500 48 Port Etherenet Switch WS-X6548-RJ21 + 73-7248-03 Board
Cisco Module WS-X6K-SUP2-2GE w/ 73-4294-14 + Dual G5484 / Flash 16 Mbyet Memory
Avocent CBL0029 REV: B, KVM Module & Cabling - SEALED
NEW Genuine CISCO SM-SRE-900-K9 Services Ready Engine Module 1TB 90-Day Warranty
Lot of 14* GENUINE Cisco 30-0703-01 1000 BASE-LX 1300nm Laser 21-CFR (J) Class 1
Lot of 10* GENUINE Cisco 30-0759-01 1000 Base-SX 850nm LASER 21 CFR (J) CLASS 1
Genuine Cisco GLC-T mini-GBIC 1000Base-T Copper RJ-45 SFP Transceiver 30-1410-02
Genuine Cisco GLC-T mini-GBIC 1000Base-T, 30-1410-02, Broken Gold Handle
Genuine Cisco GLC-T mini-GBIC 1000Base-T, 30-1410-02, Broken Yellow Handle
LOT of 2 Cisco Systems Modules, Fast Ethernet 73-1688-05 B0
NEW MTI 10 METER DUPLEX FDDI FIBEROPTIC JUMPER 62.5/125UM PVC CABLE 340042-0010
CISCO Systems PA-MC-2T1 Multi-Channel T1/PRI 2-Port Module, 73-3927-02 A0
CISCO Systems Encrypt SA-ISA Intergrated Services Module, 73-4201-07 A0
LOT of 10: Panduit F5D6P-3M3, 50/125um Opti-Jack Duplex SC, 3m Fiber Patch Cable
LOT of 10: Panduit F5D6P-3M5/N 50/125um Opti-Jack Duplex SC 5m Fiber Patch Cable
LOT of 10: Panduit F9D6P-3M3, Opti-Jack Single Mode FJ to 2 SC, 3m Patch Cable
LOT of 20: Panduit F5D6P-3M3, 50/125um Opti-Jack Duplex SC, 3m Fiber Patch Cable
LOT of 61: Panduit F5D6P-3M5/N 50/125um Opti-Jack Duplex SC 5m Fiber Patch Cable
Cisco Andiamo 9500 Series, 2x Fiber Card, 1x DS-X9530-SF1-K9?, WS-C9509
Cisco Network Processing Engine 200 for 7206 Wired Router, 73-2441-02 Rev. D0
Spectra Logic Spectra 64000 Tape Library Tower, G6162-20000 with Gator
LOT of 13 Cisco Systems Compact Flash CF, 64MB, 256MB, 16-3099-01,17-7?185-02
Cisco Catalist WS-C6509, 5x WS-X6348, 2x WS-X6K-SUP2-2GE with 24MB Memory Card
LOT OF 20: Genuine Cisco WS-G5484 GBIC, 30-0759-02, 850nm, 1000 SX Modules
LOT OF 2: Genuine Cisco GLC-SX-MM, 30-1301-02 SFP Modules
LOT OF 2: Genuine Cisco X2-10GB-CX4 V01, 10-2105-01 Transceiver Modules
LOT OF 2: Genuine Cisco X2-10GB-CX4 V03, 10-2105-03 Transceiver Modules
LOT OF 5: Genuine Cisco GLC-SX-MM SFP Modules
Cisco 64MB Compact Flash Card, CF, 16-7927-01, PMJ100628
LOT OF 16: Genuine Cisco GLC-SX-MM SFP Modules, 30-1301-02 - TESTED GOOD
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Cisco PIX 515E Firewall Ver. 6.3(1), 32MB RAM, Restricted License
Cisco PIX 515E Firewall Ver. 6.3(3)124, 32MB RAM, Restricted License
CISCO 851 W Integrated Services Router, CISCO851W-G-A-K?9, No Power Adapter
FIBERWAVE MU-MU SM Duplex Fiber Optic Patch Cable, 1-Meter Length
CISCO 2811 Router with 1DSU-T1 V2 Interface Card
Cisco 11500 Series Content Services Switch, CSS11501, 256MB Memory
Cisco ASA 5510 Adaptive Security Appliance, 256MB, Platform ASA5510-BUN-K9
LOT of 2: Cisco PIX-515E UR/FO Firewall,Unrest?ricted/Failover?, 128MB RAM, No Ear
LOT of 2: Cisco PIX-515E UR / FO Firewall, Unrestricted / Failover, 64MB RAM
Method Electronics DM7041-R, 1000BASE-T RJ-45 SFP Copper Transceiver
Cisco Catalyst 5000 Series Router WS-C5000 Chassis with Superviser Engine II MMF
GENUINE Cisco WS-X6148-RJ45 48-port 10/100Base-T Ethernet Switching Module
Cisco WS-C4006 Catalyst 4006 Series, Chassis Only, No Cards
Cisco WS-X6516-GBIC 16 Port GBIC + 16 1000Base-SX GBICs 6500/6509/7609 HW 5.5
Cisco WS-C5505 Catalyst 5505 Series, Chassis Only, No Cards
3PAR PCB 900-1031-03, 970-0089-01 with Sigma-Links SL5114A-2208 mini-GBIC Module
Cisco 2821, 2800 Series Router, CISCO02821, WIC-1AM, Factory Reset
**NEW** Cisco SM532164094XSG6?0E0 128MB, 1A DRAM Upgrade Kit for Catalyst 6000
Cisco Aironet 1200 Wireless Access Point, No AC Adapter/Antenna AIR-AP1220B-A-K?9
GENUINE Cisco VG200 Voice Access Gateway w/Voice Modules
Lot of 2* GENUINE Cisco 3600 Series Cisco 3640 Router w 2CT1-CSU / 2FE 2W/ DIGIT
Cisco Systems GESM 371098-001 V01, 12.2(25)SE1, HP BladeSystem
HP ProLiant 8-Port RJ-45 Patch Panel 2, Pass Through with Fibre, 313330-001
HP ProLiant BL, RJ-45 Patch Panel Pass Through, 253236-001
LOT of 6: JDS Uniphase JSPR21S002304, SFP 2GB Optical Transceiver GBIC Module
CISCO 3600 SERIES WITH 2 16MB FLASH CARD & A 1FE-TX MODULE
IW155-5656- 25FT ECM 25 Foot Cable Assy *NEW*
LOT OF 2 CISCO SYSTEMS CATALYST WS-C1924-R & WS-2924-XL-EN
Cisco 3660-MB-2FE Main Motherboard Chassis
LEVITON 24-Port CAT-5 Universal Patch Panel, RJ-45
Linksys / Cisco 24-Port 10/100 Switch, SR224R
CISCO SYSTEMS FASTHUB 100 SERIES 24-PORT 10BASET/100BASE?TX WS-C124T
Cisco Systems Fast Packet Card for IGX 8400 Series Systems, UAI-2/4-155-MMF?/SMF
FOR PARTS OR REPAIR: inGate Firewall 1210, SIParator 21, CAD-0208-1210-I?G
LOT of 2: Avocent SwitchView 1000 6FT KVM LCD Cable, CBL0030
Genuine Cisco GLC-T 1000Base-T Transceiver, Copper RJ-45 SFP 30-1410-02
Cisco PIX-515 FO Firewall, Failover, 64MB RAM, No Rack Ears
CISCO SYSTEMS WS-C2912-XL 12-PORT 10/100BASE-T ETHERNET SWITCH, PASS POST
50 Ft Singlemode LC/PC to L/PC Fiber Optic Patch Cord Jumper Cable
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Cisco 1720 Modular Access Router, WIC 1DSU T1
Cisco Systems 1721 Series Router, 10/100 Ethernet
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Genuine Cisco 800-13408-03 Internal WDM Controller
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Cisco IDS-4235 Intrusion Detection Sensor, Single P-III 1.2GHz, 27MQN11
Cisco MMF-8-155-MT Multi-mode fiber module MGX 8850
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Cisco SMFIR-8-155-LC, OC-3c/STM-1c , SMFIR, LC MGX8800/8900, 1300nm
CISCO WS-C2924C-XL-EN Catalyst 2900 XL Series 24-Port SWITCH
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CISCO SYSTEMS WS-C2912-XL-EN 12-PORT 10/100BASE-T ETHERNET SWITCH |
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