跳转到主内容

820-3208-A Board no green light

Hello Guys,

I have a problem that I would like some help with on this 820-3208-A logic board I’m working on. The board looks really clean and there was no water damage,. However, there was some corrosion around U6990 chip and there is no green light on the magsafe. After cleaning the corrosion and replacing the U6990 chip I only get 2.74 V on pins 2 and 4. Pins 6 and 8 both have 15.50V going in. I checked for a short to ground on the pp3v42_g3h and did find a small drop to ground. I then felt around and noticed the SMC is really hot to touch. Please tell me that the SMC is not bad!!!!!

已回答! 显示答案 我也有这个问题

这是一个好问题吗?

得分 0
添加一条评论

1个回答

已选择的解决方案

Have you checked for corrosion under SMC? That seems like the most probable cause.

这个答案有帮助吗?

得分 2

评论:

Ben is right. Remove the SMC and see if PP3V42_G3H comes back.

完成的

Thanks Ben, I will check but I'm fairly certain that the smc area is very clean. Just don't understand why I would be getting any voltage at all if there is a short on that line on the smc? I get 2.7V! Dont want to mess with smc if I can avoid it!!!

完成的

Hey guys is it possible that u5010 (SMC reset-L) is shorted and causing the smc chip to heat up? Still baffling!

完成的

@Roger What do you get on PPBUS_G3H?

完成的

添加一条评论

添加你的答案

Roger 将永远感激不已
浏览统计数据:

过去的24小时: 0

过去的7天: 0

过去的30天: 5

总计 215