"me" wrote in message
...
"blanking" blanking@brain wrote in :


"Michael A. Terrell" wrote in message
...
blanking wrote:

"Michael A. Terrell" wrote in message
...
blanking wrote:

Thanks but I want to give it a go myself, for 2 reasons, the cost
of servicing compared to buying a new similar tv and I am
reasonably handy
myself with although limited electronic knowledge. I know there
can be dangerous voltages left in the capacitors after turn off
so I presume if
I
short the power plug phase and neutral pins to the earth pin I
will discharge any voltage in the caps.


Very wrong, and a good way to die. see:
http://www.repairfaq.org/

Thanks, I should not really have said that as I knew it was not
quite right,
all I really knew was that the caps would retain a dangerous voltage
after
turn-off and would require discharging, I was laways going to
research this
bit before going ahead.



The fact that it responds to a tap on the
top of the tv makes me think it is probably not in the circuit
board, it
has
settled down at the moment but the next time it goes haywire I
will trying
tapping different parts of the tv and see if i can narrow things
down a
little there before opening it up. Is it possible for dust to
cause this
sort of problem or are there no conductive parts exposed to the
dust?


No, it isn't. There is a 99.5% probability of a cracked solder
joint. The other .5% is a damaged connector. If you look closely
at the solder work on the PC boards you will see more than one
cracked joint. the more you beat on the TV, the more damage will
occur from the
vibration.



Thanks for clearing that up, the advice here has given me a chance
of getting the tv going again, if the problem lies outside the scope
of what has been suggested here I will obviously give it up as I do
not have the technical knowledge of the workings of television.


When you find the bad joints use only rosin cored solder. Plumbing
(Acid) solder will eat the copper traces off the PC board. I prefer
a mild RMA solder like Ersin Multicore.


Yep, already have resin core solder, thanks.



then pitch it and get rosin core solder...


Woops, I meant rosin not resin.