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 |
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