Rss & SiteMap

乾龙盛产品用户交流区 //www.qls-hifi.com/bbs/

大家一起讨论音响相关的话题,有功放,音频DAC,播放器,CD转盘,音箱..
共6 条记录, 每页显示 10 条, 页签: [1]
[浏览完整版]

标题:[原创][求助]QA350更换LDO作业报告

1楼
rabbitdin 发表于:2020-4-13 0:39:22

 

 

今日an7790到货,晚饭后开始折腾,真心艰难。

 

主要是被机内电池插座挡住不好操作,那就拆吧。

 

巨难!所以顺手把插座那条尾巴切了,充电口也拆了。

 

换LDO倒是轻松,一步搞定。恢复,通电,完美。

 

再放黄小琥的没那么简单,仍然用AD827/883,天啦噜

 

完全没有之前那种力不从心、五音俱破的感觉,取而代之是大气、从容、甜润,个人听后感罢了,大家不喜勿喷啊。

 

未料,一出悲剧正上演

 

查到AD883供电电压可以上到15v,对于提高电压后的表现很是满意,心里未免大意,就想试试12v电源直供,然后就哑了!!!

仔细检查电路发现,AD883(就是原机的AD8656)与WM8740SEDS共用一个LDO!

 

真是悲催了,怪自己不够认真吧。

 

目前仅查出这个结果,还请陈总指点,WM8740供电3.3-5v,如果提高到9v貌似还能正常工作,但是否有其他隐患。谢谢。

 

所以到现在的情况是:WM8740光荣牺牲,已经下单同型号芯片,再等几天吧,电池也要到了…

 


图片点击可在新窗口打开查看


图片点击可在新窗口打开查看
2楼
clark 发表于:2020-4-13 11:53:36
8740供电电压最高只能5V,   极限电压是7V,    超过就会烧坏。 
3楼
jamesalex12 发表于:2020-4-30 16:36:48
Good information
Telecommunications Specialist
4楼
Jacobliam 发表于:2020-9-10 18:13:40
Assignment help
5楼
miqi008 发表于:2020-9-29 11:50:55
我也有一台,请教楼主那个elan电容式多少容量的,装得进去?
6楼
Steven_Nieves 发表于:2021-2-6 0:45:01
Interesting experience in replacing LDO, thanks to the author. During your replacement, you faced a lot of problems that could have been avoided if you immediately watched videos on YouTube, which show how to properly replace LDOs and eliminate problems that you may encounter. I found about ten videos on this topic there and noticed that most of them were posted by accounts with about 43 thousand subscribers! I am sure this is because the owners of these accounts used the help of https://soclikes.com/buy-youtube-subscribers in order to wind up subscribers for YouTube.
共6 条记录, 每页显示 10 条, 页签: [1]

Copyright © 2009 - 2012 qlshifi.com 官方微信公众号

Powered By Dvbbs Version 8.3.0
Processed in .02344 s, 2 queries.