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标题: Toshiba C660 LA-6842P short circuit [打印本页]
作者: vusalcrm 时间: 2020-6-24 05:22
标题: Toshiba C660 LA-6842P short circuit
本帖最后由 vusalcrm 于 2020-6-24 05:32 编辑
Model: Toshiba Satellite C660
Motherboard Code: LA-6842P Rev 1.0
Hello to everyone
Motherboard does not start. Current draw with adapter connect (0.045A -0.056A)
Battery is connected. Only start led light active (low). But no start
I connectedit to the power supply and watched it with a thermal camera.
Heated part MOSFET (at the second MOS) P Channel 30V
Let's start measuring with a multimeter. Both MOSFET are intact ( M1 and M2 p channel)
No short circuit in +19V line 7.26mOhm (Normal)
Need to measure standby voltage coils
+3VALWP Coil – 8.57kOhm (Normal)
Need to measure standby voltage coils.
+5VALWP Coil – 14.10kOhm (Normal)
Then let's measure the value of the LDO line.
LDO +3.3V – 45.2Ohm (short circuit)
Then let's measure the value of the LDO line.
LDO +5.0V – 36.52kOhm (normal)
Let's separate the standby PWM on the motherboard (TPS51125A) Then let's measure the value of the LDO line.
LDO +3.3V – 45.2Ohm (short circuit)
There is still a short circuit in the LDO+3.3V line
Let's give 3V to the short circuit linefrom outside
Thermal camera comes to help

Heated part SIO ENE KB926QF
Let's take it off the motherboard SIO. And let's remeasure the LDO +3.3V line. No short circuit.
LDO+3.3 – 1.34mOhm (normal) Very Good.
I can't solder the standby PWM and replace new SIO KB926QF
Let's connect the motherboard to the power supply
Measure the standby voltage. Very good. The voltages are OK
Happy ending... Good day

作者: 71850811 时间: 2020-6-24 08:11
国际友人,全是英文,是换ec好的嘛
作者: H55 时间: 2020-6-24 08:42
LDO -Ec short! Good job!
作者: 胡伟111 时间: 2020-6-24 10:33
什么啊,英文看不懂啊
作者: 李漂渺 时间: 2020-6-24 11:26
线性3.3V短路 排查 EC损坏 更换 故障解决
作者: 龙宽九段 时间: 2020-6-24 12:01
So good,
作者: Linshengqiang 时间: 2020-6-24 17:07
英文啊 有点看不懂
作者: pyjincheng 时间: 2020-6-24 22:32
这个有点高深莫测了 看来是我学历太低了吧 不行到时饼哥弄个可@以在帖子里直接翻译的程序进来好了
作者: 19160264076 时间: 2020-6-24 23:10
文化有限,读不懂
作者: 卖电脑的小快乐 时间: 2020-6-24 23:11
good
作者: 花花火火 时间: 2020-6-25 08:24
em....真心看不懂哎,对了国外人气较高的维修论坛叫啥啊?有空了我要多逛逛学习学习,
作者: LFG 时间: 2020-6-25 08:46
3V LDO短路,最后是EC问题 这问题还是比较常见的
作者: 小熊真麻烦 时间: 2020-6-25 09:08
very good!!国外都知道迅维了
作者: kerokrrl 时间: 2020-6-25 11:02
多点外国人进来也是不错,也可以多多练一下英文久了就慢慢看会了,大不了百度翻译一下...
作者: 123456胜华 时间: 2020-6-25 11:07
这位是外大袖啊,见识了大神。
作者: 风骑士 时间: 2020-6-25 14:53
看不懂系列。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
作者: AYA5205861 时间: 2020-6-25 17:15
设备很先进,我一般用手。谢谢分享。
作者: AYA5205861 时间: 2020-6-25 17:17
我们这边一般用二极管档位测试,红表笔接地,黑表笔量测试点。
作者: 张铎 时间: 2020-6-25 20:24
pyjincheng
这个有点高深莫测了 看来是我学历太低了吧 不行到时饼哥弄个可@以在帖子里直接翻译的程序进来好了@月饼
作者: liuphong 时间: 2020-6-26 07:05
Thank you for sharing!
作者: 小飞2H 时间: 2020-6-26 12:04
VERY VERY GOOD!!!
作者: 维修徒徒 时间: 2020-6-26 13:18
这老外厉害啊 测温度的还有那种屏幕能显示的厉害
作者: yzlshww 时间: 2022-11-28 09:19
Thank you for sharing!云里雾里。
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