Prev: Connecting 2 PCs modem-to-modem
Next: Philips 32PF5411 / 10 flat TV set problems
From: JR North on 3 Jan 2010 01:21
I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------
From: Arfa Daily on 3 Jan 2010 05:30

"JR North" <junkjasonrnorth(a)bigfoot.com> wrote in message
news:stc0k593gpjtpc2skq0ipev8j2hd33ca99(a)4ax.com...
>I love it when stuff works out. I'm not an electronics repair tech by
> any means, but can usually fix stuff anyway. Monitor would sometimes
> power up, but no screen. Other times, the screen brightness would
> slowly go up and down, then down to blank screen. A light whack on the
> case would usually fix it, temporarily. Eventually, the whack stopped
> working, and the monitor would not drive the screen at all. Almost
> pitched it, but decided to give it a shot first. Took the case apart,
> discharged the HV, removed the neck board and unsoldered/removed the
> shield on it. Reflowed the connections to the neck socket, and some
> other iffy-looking solder joints. Works great again.
> JR
> HOME PAGE:
> http://www.seanet.com/~jasonrnorth
> --------------------------------------------------

Well done Jason ! Always gratifying when something like that works out, and
good to have saved it from landfill, if nothing else.

Arfa


From: David on 3 Jan 2010 18:29
In article <stc0k593gpjtpc2skq0ipev8j2hd33ca99(a)4ax.com>,
JR North <junkjasonrnorth(a)bigfoot.com> wrote:

> I love it when stuff works out. I'm not an electronics repair tech by
> any means, but can usually fix stuff anyway. Monitor would sometimes
> power up, but no screen. Other times, the screen brightness would
> slowly go up and down, then down to blank screen. A light whack on the
> case would usually fix it, temporarily. Eventually, the whack stopped
> working, and the monitor would not drive the screen at all. Almost
> pitched it, but decided to give it a shot first. Took the case apart,
> discharged the HV, removed the neck board and unsoldered/removed the
> shield on it. Reflowed the connections to the neck socket, and some
> other iffy-looking solder joints. Works great again.
> JR
> HOME PAGE:
> http://www.seanet.com/~jasonrnorth
> --------------------------------------------------


Dry joints seem to be one of the very common faults modern gear seems to
fall prey to - I wonder if they still have people inspecting and
correcting the soldering these days.

Many years ago I spent a few days on a production line 'dryjointing'
circuit boards after they came through the solder bath. Mongrel of a
job, but when you are young you do what you are told.

The girls that did this on a day to day basis complained of sore eyes
from the glare.

Perhaps things have changed

David
From: Arfa Daily on 3 Jan 2010 20:37

"David" <postings(a)REMOVE-TO-REPLYconfidential-counselling.com> wrote in
message news:postings-D6C788.10292204012010(a)news.bigpond.com...
> In article <stc0k593gpjtpc2skq0ipev8j2hd33ca99(a)4ax.com>,
> JR North <junkjasonrnorth(a)bigfoot.com> wrote:
>
>> I love it when stuff works out. I'm not an electronics repair tech by
>> any means, but can usually fix stuff anyway. Monitor would sometimes
>> power up, but no screen. Other times, the screen brightness would
>> slowly go up and down, then down to blank screen. A light whack on the
>> case would usually fix it, temporarily. Eventually, the whack stopped
>> working, and the monitor would not drive the screen at all. Almost
>> pitched it, but decided to give it a shot first. Took the case apart,
>> discharged the HV, removed the neck board and unsoldered/removed the
>> shield on it. Reflowed the connections to the neck socket, and some
>> other iffy-looking solder joints. Works great again.
>> JR
>> HOME PAGE:
>> http://www.seanet.com/~jasonrnorth
>> --------------------------------------------------
>
>
> Dry joints seem to be one of the very common faults modern gear seems to
> fall prey to - I wonder if they still have people inspecting and
> correcting the soldering these days.
>
> Many years ago I spent a few days on a production line 'dryjointing'
> circuit boards after they came through the solder bath. Mongrel of a
> job, but when you are young you do what you are told.
>
> The girls that did this on a day to day basis complained of sore eyes
> from the glare.
>
> Perhaps things have changed
>
> David

Only for the worse I'm afraid, David. It's all lead-free solder now, and dry
joints are a bigger problem than they they have ever been in the past - even
back to the early days of printed circuit introduction, when the technology
of automated soldering was young and immature ...

The problem is made doubly bad by the utterly different characteristics of a
lead-free bad joint. It is very typical for a joint to go intermittent
completely randomly, but not be able to be provoked by physical disturbance,
heating or freezing, and yet when you actually find the little mutha, it
will often be such a bad joint that the solder has not stuck to the
component leg at all, and you can actually pull it out of the board. Apart
from that, you can no longer spot a bad joint at twenty paces, as you could
with leaded solder. With lead-free, *all* joints look bad to the
traditionally trained eye ...

Arfa


From: hr(bob) hofmann on 3 Jan 2010 21:16
On Jan 3, 7:37 pm, "Arfa Daily" <arfa.da...(a)ntlworld.com> wrote:
> "David" <posti...(a)REMOVE-TO-REPLYconfidential-counselling.com> wrote in
> messagenews:postings-D6C788.10292204012010(a)news.bigpond.com...
>
>
>
>
>
> > In article <stc0k593gpjtpc2skq0ipev8j2hd33c...(a)4ax.com>,
> > JR North <junkjasonrno...(a)bigfoot.com> wrote:
>
> >> I love it when stuff works out. I'm not an electronics repair tech by
> >> any means, but can usually fix stuff anyway. Monitor would sometimes
> >> power up, but no screen. Other times, the screen brightness would
> >> slowly go up and down, then down to blank screen. A light whack on the
> >> case would usually fix it, temporarily. Eventually, the whack stopped
> >> working, and the monitor would not drive the screen at all.  Almost
> >> pitched it, but decided to give it a shot first. Took the case apart,
> >> discharged the HV, removed the neck board and unsoldered/removed the
> >> shield on it. Reflowed the connections to the neck socket, and some
> >> other iffy-looking solder joints. Works great again.
> >> JR
> >> HOME PAGE:
> >>http://www.seanet.com/~jasonrnorth
> >> --------------------------------------------------
>
> > Dry joints seem to be one of the very common faults modern gear seems to
> > fall prey to - I wonder if they still have people inspecting and
> > correcting the soldering these days.
>
> > Many years ago I spent a few days on a production line 'dryjointing'
> > circuit boards after they came through the solder bath.  Mongrel of a
> > job, but when you are young you do what you are told.
>
> > The girls that did this on a day to day basis complained of sore eyes
> > from the glare.
>
> > Perhaps things have changed
>
> > David
>
> Only for the worse I'm afraid, David. It's all lead-free solder now, and dry
> joints are a bigger problem than they they have ever been in the past - even
> back to the early days of printed circuit introduction, when the technology
> of automated soldering was young and immature ...
>
> The problem is made doubly bad by the utterly different characteristics of a
> lead-free bad joint. It is very typical for a joint to go intermittent
> completely randomly, but not be able to be provoked by physical disturbance,
> heating or freezing, and yet when you actually find the little mutha, it
> will often be such a bad joint that the solder has not stuck to the
> component leg at all, and you can actually pull it out of the board. Apart
> from that, you can no longer spot a bad joint at twenty paces, as you could
> with leaded solder. With lead-free, *all* joints look bad to the
> traditionally trained eye ...
>
> Arfa- Hide quoted text -
>
> - Show quoted text -

AMEN!!!
 |  Next  |  Last
Pages: 1 2
Prev: Connecting 2 PCs modem-to-modem
Next: Philips 32PF5411 / 10 flat TV set problems