Home  |  Contents 

Microcontroller and PC projects
  Forum Index : Microcontroller and PC projects         Section
Subject Topic: I broke it Post ReplyPost New Topic
Author
Message << Prev Topic | Next Topic >>
lew247
Guru
Guru
Avatar

Joined: 23 December 2015
Location: United Kingdom
Online Status: Offline
Posts: 925
Posted: 18 June 2018 at 8:56am | IP Logged Quote lew247

Yes I stupidly tried to solder smd and failed miserably!

Has anyone got a 7inch SSD1963 display and a multimeter?

If you have would you please measure where the pins on the backlight control smd solder points go to please?

I could do with the 1963_PWM if you could tell me where else on the board those two pins are connected to please?
Then I can use a wire jumper to "botch it"

Because my "soldering attempt" totally removed the solder points and left nothing behind that is solderable to

{I'm "hoping" it goes somewhere else before it reaches that SMD cpu with the tiny pins")

I'm guessing one side of it should go to 0V the other hopefully through another component that is easier to solder a wire to


Back to Top View lew247's Profile Search for other posts by lew247
 
Azure
Guru
Guru
Avatar

Joined: 09 November 2017
Location: Australia
Online Status: Offline
Posts: 300
Posted: 18 June 2018 at 4:31pm | IP Logged Quote Azure

This my second attempt, type a long reply and got an error message when I pressed post reply.

My board has three resistors for the backlight control settings option as follows:
Position Part Description
Top resistor R8 1963_PWM
Middle resistor R7 LED_A
Bottom resistor R9 Always On

R8 left side goes to a plate through hole just above to the left.
Plate through hole goes to PWM1963 pin 51 which is the backlight PWM pin. There is a plate through hole to the right of the track coming from that pin you might be ale to solder to.
R8 right side is connected to the right side of R7, the left side of R9, the top of R10 and the top right pin of U4.


R7 left side goes to a plate through hole directly above it.
Plate through hole goes to the main interface connector second pin down on left labelled LED_A.
R7 is connected to R8 right side, R9 left side, R10 top and top right pin of U4.

R9 left side is connected to R8 right side, R7 right side, R10 top and top right pin of U4.
R9 right side is connected to the right side of C26 below it.

Hope that matches your board type and is what you wanted.
Back to Top View Azure's Profile Search for other posts by Azure
 
lew247
Guru
Guru
Avatar

Joined: 23 December 2015
Location: United Kingdom
Online Status: Offline
Posts: 925
Posted: 21 June 2018 at 4:44am | IP Logged Quote lew247

Thank you so much Azure
Sorry for the delay replying but I'm in Spain till next Monday and only just logged in on my phone
Back to Top View lew247's Profile Search for other posts by lew247
 
lew247
Guru
Guru
Avatar

Joined: 23 December 2015
Location: United Kingdom
Online Status: Offline
Posts: 925
Posted: 09 July 2018 at 5:36pm | IP Logged Quote lew247

I really cannot believe this - well I can as it's happened
I did exactly the same thing with the new screen I bought 65 wasted!
I really have to stop trying to solder, my eyes are just not good enough
Back to Top View lew247's Profile Search for other posts by lew247
 
Grogster
Guru
Guru
Avatar

Joined: 31 December 2012
Location: New Zealand
Online Status: Offline
Posts: 5887
Posted: 10 July 2018 at 9:07am | IP Logged Quote Grogster

What are you actually trying to do with the SMD on the LCD?

__________________
Smoke makes things work. When the smoke gets out, it stops!
Back to Top View Grogster's Profile Search for other posts by Grogster Visit Grogster's Homepage
 
TassyJim
Guru
Guru


Joined: 07 August 2011
Location: Australia
Online Status: Offline
Posts: 2541
Posted: 10 July 2018 at 9:38am | IP Logged Quote TassyJim

Grogster wrote:
What are you actually trying to do with the SMD on the LCD?


Change the jumper for the backlight control options.
I find them a bugger too.

Jim

__________________
It all started with the ZX81....
VK7JH
http://www.c-com.com.au/MMedit.htm
Back to Top View TassyJim's Profile Search for other posts by TassyJim Visit TassyJim's Homepage
 
Grogster
Guru
Guru
Avatar

Joined: 31 December 2012
Location: New Zealand
Online Status: Offline
Posts: 5887
Posted: 10 July 2018 at 9:42am | IP Logged Quote Grogster

OH! Gotcha! Thanks.

For some reason, I thought he was trying to hack the 1963 chip or something.

Yes, the pads are tiny, and de-laminate easily if you are not careful. I found that the easiest method - for me - was to remove the little zero-ohm resistor, and bin it - it's so tiny and too fiddly to work with. Now use a single strand of wire from some stranded hookup wire as your new link, and solder-blob that across the pads with some flux. You must solder very quickly, or the heat will zoom down the strand and melt the first blob. Now cut off the excess strand with side-cutters. Done.

__________________
Smoke makes things work. When the smoke gets out, it stops!
Back to Top View Grogster's Profile Search for other posts by Grogster Visit Grogster's Homepage
 


If you wish to post a reply to this topic you must first login
If you are not already registered you must first register

  Search the forums using Google.
In the news...
 
Post ReplyPost New Topic
Printable version Printable version
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

Powered by Web Wiz Forums version 7.8
Copyright ©2001-2004 Web Wiz Guide

This page was generated in 0.1406 seconds.
Privacy Policy     Process times : 0.02, 0, 0, 0.12