西门子触摸屏电路基础
西门子触摸屏黑屏不加电
西门子触摸屏黑屏维修Smart1000iev3,用灯光照也没有任何图像。
打开后发现这个降压芯片已经损坏了。
在显微镜下可以看到明显烧坏的痕迹。
一般是由于TL431损坏,导至各路输出电压均不正常。
更换降压芯片和TL431后各路电压也就都正常了。
西门子触摸屏上电黑屏
24V转5V的电路出问题,首要检查降压块。
再者就是光耦和电源芯片要做为检测对象。
西门子触摸屏上电黑屏
不加电一般是电源管理芯片出问题了。
常用的芯片引脚及功能定义表
序号 | 丝印 | 型号 | 引脚定义 | 备注 |
---|---|---|---|---|
1 | 40210 | TPS40210 | ![]() |
电压的 4.5V 至 52V 宽输入范围电流模式升压控制器 |
2 | Y13 | BZX84C36LT1G | ![]() |
250毫瓦;齐纳二极管稳压器,36V SOT23 |
3 | 9AB | BC856BMTF | ![]() |
双极晶体管 PNP 65V 100mA SOT23 |
4 | 1Bt或3Bt | BC846BW | ![]() |
NPN三极管 SOT23 |
5 | Z7 | BZX84C8V2 | ![]() |
8.2V贴片稳压二极管 SOT23 |
6 | AF3 | SN74AHC1G14DCKR | ![]() |
具有施密特触发输入的单路 2V 至 5.5V 反相器 |
7 | ABAA | MAX809M | ![]() |
复位电路 SOT23 |
8 | 1A 1B 1C | BC846A BC846B BC846C | ![]() |
NPN, 65V, 0.1A, SOT23 |
9 | B1C | MBRS1100T3G | ![]() |
100V 1A肖特基二极管 |
10 | TL431I | TL431IDR | ![]() |
可调精密并联稳压器芯片 |
11 | 217A | IL217AT | ![]() |
贴片光耦 |
12 | 19N10L | 19N10L | N沟 MOS场效应管 | |
13 | 10P6F6 | 10P6F6 | P沟道 10A 60V MOS场效应管 | |
14 | VP1176 | SN65HVD1176DR | ![]() |
PROFIBUS RS-485 收发器 |
15 | L1117 | L1117 | ![]() |
液晶屏贴片稳压管 |
16 | QVB | TLV62065 | ![]() |
开关稳压器芯片 |
17 | G5N | SGM61030 | ![]() |
电源管理芯片 |
18 | G101STN01.0 | S513 | ![]() |
10.1寸液晶屏 |
Bem embalado. Surpreendeu pela qualidade.
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# Harvard University: A Legacy of Excellence and Innovation
## A Brief History of Harvard University
Founded in 1636, **Harvard University** is the oldest and one of the most prestigious higher education institutions in the United States. Located in Cambridge, Massachusetts, Harvard has built a global reputation for academic excellence, groundbreaking research, and influential alumni. From its humble beginnings as a small college established to educate clergy, it has evolved into a world-leading university that shapes the future across various disciplines.
## Harvard’s Impact on Education and Research
Harvard is synonymous with **innovation and intellectual leadership**. The university boasts:
– **12 degree-granting schools**, including the renowned **Harvard Business School**, **Harvard Law School**, and **Harvard Medical School**.
– **A faculty of world-class scholars**, many of whom are Nobel laureates, Pulitzer Prize winners, and pioneers in their fields.
– **Cutting-edge research**, with Harvard leading initiatives in artificial intelligence, public health, climate change, and more.
Harvard’s contribution to research is immense, with billions of dollars allocated to scientific discoveries and technological advancements each year.
## Notable Alumni: The Leaders of Today and Tomorrow
Harvard has produced some of the **most influential figures** in history, spanning politics, business, entertainment, and science. Among them are:
– **Barack Obama & John F. Kennedy** – Former U.S. Presidents
– **Mark Zuckerberg & Bill Gates** – Tech visionaries (though Gates did not graduate)
– **Natalie Portman & Matt Damon** – Hollywood icons
– **Malala Yousafzai** – Nobel Prize-winning activist
The university continues to cultivate future leaders who shape industries and drive global progress.
## Harvard’s Stunning Campus and Iconic Library
Harvard’s campus is a blend of **historical charm and modern innovation**. With over **200 buildings**, it features:
– The **Harvard Yard**, home to the iconic **John Harvard Statue** (and the famous “three lies” legend).
– The **Widener Library**, one of the largest university libraries in the world, housing **over 20 million volumes**.
– State-of-the-art research centers, museums, and performing arts venues.
## Harvard Traditions and Student Life
Harvard offers a **rich student experience**, blending academics with vibrant traditions, including:
– **Housing system:** Students live in one of 12 residential houses, fostering a strong sense of community.
– **Annual Primal Scream:** A unique tradition where students de-stress by running through Harvard Yard before finals!
– **The Harvard-Yale Game:** A historic football rivalry that unites alumni and students.
With over **450 student organizations**, Harvard students engage in a diverse range of extracurricular activities, from entrepreneurship to performing arts.
## Harvard’s Global Influence
Beyond academics, Harvard drives change in **global policy, economics, and technology**. The university’s research impacts healthcare, sustainability, and artificial intelligence, with partnerships across industries worldwide. **Harvard’s endowment**, the largest of any university, allows it to fund scholarships, research, and public initiatives, ensuring a legacy of impact for generations.
## Conclusion
Harvard University is more than just a school—it’s a **symbol of excellence, innovation, and leadership**. Its **centuries-old traditions, groundbreaking discoveries, and transformative education** make it one of the most influential institutions in the world. Whether through its distinguished alumni, pioneering research, or vibrant student life, Harvard continues to shape the future in profound ways.
Would you like to join the ranks of Harvard’s legendary scholars? The journey starts with a dream—and an application!
https://www.harvard.edu/
Aprovado. Superou expectativas.
O BCE é o banco central dos ibercaja empresas países da UE que utilizam o euro. O nosso principal objetivo é a manutenção da estabilidade de preços. Para o efeito
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