HIKVISION

DS-1663ZJ Ceiling Mounting Bracket Indoor/Outdoor

285.00 EGP
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DS-7608NI-K2

3,899.00 EGP
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DS-7616NI-K2

4,399.00 EGP
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DS-7604NI-K1/4P(B)

3,499.00 EGP
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DS-7608NI-K2/8P

6,399.00 EGP
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DS-7616NI-K2/16P

8,799.00 EGP
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EZVIZ

CS-C3A-A0-1C2WPMFBR

3,333.00 EGP
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CS-CV246B0-1C1WFR

1,111.00 EGP
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CS-CV246-A0-1C2WFR

1,299.00 EGP
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CS-CV248-A0-32WFR

1,499.00 EGP
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HiLook

THC-T120-PC 2 MP EXIR Turret Camera

260.00 EGP
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THC-T120-MC 2 MP EXIR Turret Camera

370.00 EGP
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THC-T220-P2 MP EXIR Turret Camera

460.00 EGP
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THC-T220-M 2 MP EXIR Turret Camera

600.00 EGP
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THC-T120-PS

530.00 EGP
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THC-T123-P2 MP EXIR Turret Camera

485.00 EGP
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Dahua

DH-HAC-T1A21

259.00 EGP
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DH-HAC-D1A21

359.00 EGP
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DH-HAC-T2A21

375.00 EGP
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DH-HAC-HDW1220M

400.00 EGP
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DH-HAC-HDW1220SL

619.00 EGP
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DH-HAC-HDW1239TP-LED

849.00 EGP
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Hard Disk

HIKVISION 1TB-WD-Purple-Surveillance-Hard-Drives

900.00 EGP
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2TB WD Purple Surveillance Hard Drives

1,150.00 EGP
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6TB WD PURPLE Surveillance Hard Drives

3,250.00 EGP
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HDD WD 750G BLUE

350.00 EGP
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H.D.D 1TB WD PURPLE

937.00 EGP
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RECEIPT PRINTER

Alfa AU300i

1,700.00 EGP
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Alfa 80250 ivn

1,600.00 EGP
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Alfa Ac 250 I ( Compact Printer )

1,100.00 EGP
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Alfa AL 180 ii

1,300.00 EGP
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Alfa AC-180 i

900.00 EGP
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Label Printers

Alfa (B-555)

1,300.00 EGP
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Alfa (B-777)

1,500.00 EGP
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Barcode Scanner

Alfa 500 -2D

800.00 EGP
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Alfa 1500g – A

550.00 EGP
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Alfa 1500g – M

500.00 EGP
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BGA_page1_image1-1
Laptop

让你了解笔记本维修之顶级篇—BGA维修

笔记本主板到现在为止,还没有像台式一样统一的标准,不同品牌,不同型号的笔记本都不 一样。如果真的是主板坏了,换块主板,动则要上千元,甚至几千元的支出。对现在笔记本 越来越大众化的情况,手头这台坏机器就像块鸡肋,吃之无味,弃之可惜。所以笔记本主板 的芯片级维修就是一种势在必行的趋势。 说到芯片级维修,这里有必要给刚入门的菜鸟与对想多了解笔记本维修技术的朋友讲解一下 什么叫做芯片级维修。一般笔记本维修可分为三级: 一级维修:叫做板卡级维修,指能判断笔记本损坏的部位,然后对相应的部件做更换。例如 键盘坏了,就换键盘;主板坏了,就直接更换主板。 二级维修:就是所谓的芯片级维修。这过程在一级的基础上,深入了解主板工作流程,并借 助相应测量工具,像万用表,示波器等工具。对主板进行诊断,找出坏的芯片,并进行相应 的更换。 随之数码产品的集成化越来越高,现在笔记本几乎集成了所有数码产品的功能。下面笔者在 见到SONY的一款笔记本的主板,就只有人的手掌那么大,但跟别的笔记本一样所有功能一 应俱全。 仔细看一下,上面除了一些简单的元件外,就是那个大的BGA封装的芯片。这也为主板的 芯片级带来了相应挑战,要解决这个BGA问题,就得有一只维修利器:BGA焊接机器。才 能真正做到芯片级维修。关于BGA维修的操作过程,在后面会给大家,仔细讲解。 三级维修:线路级别维修。就是对主板上的线路进行分板,这主要工厂里的主板设计工程师 才有能力进行维修。如果主板真的是线路不良,也就意味这个主板寿终正寝了,没得救。 话归正题,什么叫做BGA维修呢?其实BGA是只是英文Ball Grid Array Package的简称,中文的意思是球栅阵列封装技术,该技术的出现便成为CPU、主板南、北 桥芯片等高密度、高性能、多引脚封装的最佳选择。简单讲BGA维修也就是对这种封装芯 片进更换。 BGA维修,也常见于台式机上面,只不过台式主板价格的确太便宜,修一块还不如换一块, 所以就比较少人在做这边的维修。还有一些个人的维修店,用热风枪与电热炉直接在BGA 芯片上面加热方式,对芯片进行更换,这种情况因为对温度的把握不准确,只是局部对主板 上面的BGA芯片加热方式,即使有时能好,也有很不稳定的因素在主板里面,很多情况会 造成更严重的后果,主板会因为受热不均匀而导致主板变形,更严重点,甚至会把板子报废 掉。下面是主板PCB与BGA芯片由于受热不均而导致变形的侧面示例图。 所以说有病不要乱就医,治病找个好医生。 下面我就以IBM笔记本里面T41,T40,T42,R50等比较常见的通病加不了电,开不了机 情况。主要是南桥问题,要进行BGA维修。 1 BGA机器处于待机状态 2 把主板架到BGA机器,并利用红外系统进行对位,此时电脑屏幕上面蓝色表示主板底部的温 度,红色表示BGA芯片表面的温度。 3

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Bios FlashXP MCEThis document describes how to flash a new BIOS onto the Ego. The following steps need to be taken: Check the current BIOS versionTake out the battery and connect the AC adapterInstall the new Quick Access KeysUnzip the

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Bios FlashXP MCEThis document describes how to flash a new BIOS onto the Ego. The following steps need to be taken: Check the current BIOS versionTake out the battery and connect the AC adapterInstall the new Quick Access KeysUnzip the

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BIOS chip substitution problem

BIOS chip substitution problemA former colleague, received at noon today (which is a repair novice) calls that have a bad BIOS chip, and changed a few will not work, ask me how to solve. He said that a P4M800M motherboard

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Python Programming for Kids

(Ages 10-16) Organized by Devopedia. Visit https://devopedia.org 0 Installation Install Python 3.5 or later from https://www.python.org/download/. This installation comes with pip, a tool to install additional Python packages. You can upgrade pip if required:  Windows: python -m pip install

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Uncategorized

SSSPPPIII™™

OOvveerrvviieeww aanndd UUssee ooff tthhee PPIICCmmiiccrroo SSeerriiaall PPeerriipphheerraall IInntteerrffaaccee Getting Started: SPI © Date:

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