Re: FT77/757/767 display possibly needed !!

"hugh.g.rekshun" <trugoy_cream@xxxxxxxxxxx> wrote in message
news:mgFVe.6625$yF2.2158@xxxxxxxxxxxxxxxxxxxxxxx
> Top posting makes it easier to read the reply..
>
> Ok i have checked for dry joints and not a sausage..

Well, they aren't always that obvious. Try 'flexing' the board slightly (see
below).

> so the smokey bit could mean to be there ??

If it's is a gas discharge display, yes.

> i was not sure as i have the same thing on 430 display..but if you say
> it's meant to be there i won't argue..

I don't recall the display on the 430, is it of a similar type? Also, the
"burnt bit" isn't always that obvious and/or maybe the manufacturer used a
different technique.

> right any ideas what to look at ??

Flex the PCB, do a bit of wiggling (power on but using a insulated tool).

> there are several transistors and a voltage regulator that is NOT on the
> parts list !!
> wheres a good place to start..

I've not got a circuit to hand, do you have it in PDF format?

In general, if you have ruled out a dry joint or broken track, check the
voltages on the display and 'work back' from there.

> the previous owner say's it was tested and working 100% prior to posting,
> and i do not doubt him.

That hints at an intermittent fault, may precipitated by a "knock" as you
say.

> possibly the radio has had a knock in transit ??
> any other areas where to look..

Based on experience of radios of some 'vintage', I'd start with a 'wiggle'
and see if the fault goes (even for a short time).

If nothing shows up, check a few voltages.

--
73
Brian, G8OSN
www.g8osn.org.uk


.

Relevant Pages

  • Re: FT77/757/767 display possibly needed !!
    ... Top posting makes it easier to read the reply.. ... Ok i have checked for dry joints and not a sausage.. ... >> just bought a FT77 and theres no display.. ... >> on removing the display board i can see a smoked/cloudy area to one side ...
    (uk.radio.amateur)
  • Re: Audio Innovations silver speaker cable
    ... However many of us prefer to display the postings ... posting, in order to be able to read discussions in chronological order. ... Thus it isn't really a matter of what is possible. ... Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html ...
    (uk.rec.audio)
  • Re: help!! How do I block emails?
    ... You haven't concealed your address in this posting, ... The E-mail address will be displayed on the Properties display. ... might explain the increased Spam which you've seen. ... left-click Accounts ...
    (microsoft.public.windows.inetexplorer.ie6_outlookexpress)
  • Re: More on VRAMs
    ... A follow-up to my last posting. ... The error message is "The currently selected display resolution is ... Dan the K wrote: ... > have arrows going all the way out. ...
    (comp.sys.ibm.ps2.hardware)
  • RE: How to create a label which only displays a certain amount of characters?
    ... you want the WebForm Label control to only ... I think you may do like this(Suppose you only want to display the Text's ... public class WebCustomControl1: System.Web.UI.WebControls.Label ... This posting is provided "as is" with no warranties and confers no rights. ...
    (microsoft.public.dotnet.framework.aspnet.webcontrols)