a***2
发帖数: 1399 | 1 我修过好几台笔记本主板 电源， 都是 碰运气 找到 坏的 器件，换了就好了。
电容坏的 居多，也有 管脚 虚焊的。
有没有这方面的 资料书籍，学习一下原理，可以帮助查故障？我本科是EE的，
开关电源没怎么学过。 |
c*********6
发帖数: 858 | 2 As far as the power supply of notebook computer, the +5v converted by the +
18.5v is always on. When you hit the power button, it will give a pulse to
the power management IC to enable the voltage regulator to generate the
power supply of CPU, +3v and +1.25v(depends on what kind of the CPU).
The switch regulator often has a high frequency oscilator ( from several
hundreds kilo Hz to tens Mega-Hz) to control power mosfets to get the
desired voltage. |
d****o
发帖数: 1112 | 3 http://en.wikipedia.org/wiki/Switched-mode_power_supply
start from here...
【在 a***2 的大作中提到】
: 我修过好几台笔记本主板 电源， 都是 碰运气 找到 坏的 器件，换了就好了。
: 电容坏的 居多，也有 管脚 虚焊的。
: 有没有这方面的 资料书籍，学习一下原理，可以帮助查故障？我本科是EE的，
: 开关电源没怎么学过。
|
a***2
发帖数: 1399 | 4 短短几句话， 给我的启示太大了。有些主板按Power button, no response at all.
some mother board, push the power button, give you 3 second power up, then
shut down....
一下就界定出不同的问题模块。好， 我要找点资料看看。
手工换那些surface-mount device (SMD) 还真有点累，还好已经积累了点经验和工具。
【在 c*********6 的大作中提到】
: As far as the power supply of notebook computer, the +5v converted by the +
: 18.5v is always on. When you hit the power button, it will give a pulse to
: the power management IC to enable the voltage regulator to generate the
: power supply of CPU, +3v and +1.25v(depends on what kind of the CPU).
: The switch regulator often has a high frequency oscilator ( from several
: hundreds kilo Hz to tens Mega-Hz) to control power mosfets to get the
: desired voltage.
|
f*****0
发帖数: 489 | 5 on a standard atx power supply, pushing the power button shorts the standby
+5v to ground and the current flowing through it triggers the power supply
and bring on the rest.
most power supplies are in the hundred khz to 1mhz range. very hard to
switch high power in the multi-mhz range. |
a***2
发帖数: 1399 | 6 在哪里可以找到一些常用笔记本电脑 开关电源部分的电路图？
【在 c*********6 的大作中提到】
: As far as the power supply of notebook computer, the +5v converted by the +
: 18.5v is always on. When you hit the power button, it will give a pulse to
: the power management IC to enable the voltage regulator to generate the
: power supply of CPU, +3v and +1.25v(depends on what kind of the CPU).
: The switch regulator often has a high frequency oscilator ( from several
: hundreds kilo Hz to tens Mega-Hz) to control power mosfets to get the
: desired voltage.
|
h*******l
发帖数: 252 | 7 Such as DEll R&D center.
The venders like TI,MAXIM have the IC sulotion on website.
【在 a***2 的大作中提到】
: 在哪里可以找到一些常用笔记本电脑 开关电源部分的电路图？
|
