Thomson set-top box

[Graeme]

Thomson set-top box for UK freeview reception. Model DTI 1000.
This unit (not mine) keeps blowing its internal fuse. From what I've been
told, this only happens on power-up. The fuse that I've removed is a
standard 1A 20mm type. Does anyone know of the cause (is it typical for this
model), or what the recommended fuse rating/type should be (marking on the
circuit baord next to fuse is "T1AL")? There are no obvious damaged
components inside.
Thanks.

 

[David]

Send it out for service to Thomson. Even here in the US the set top
boxes have ZERO information or parts available, they must be shipped
to the manufacture as they are keeping tight lids on the technology
used.

David

"Graeme" <graeme@hotmail.com> wrote in message news:<c6o841$e0elh$1@ID-154333.news.uni-berlin.de>...

Thomson set-top box for UK freeview reception. Model DTI 1000.
This unit (not mine) keeps blowing its internal fuse. From what I've been
told, this only happens on power-up. The fuse that I've removed is a
standard 1A 20mm type. Does anyone know of the cause (is it typical for this
model), or what the recommended fuse rating/type should be (marking on the
circuit baord next to fuse is "T1AL")? There are no obvious damaged
components inside.
Thanks.

 

[Peter Duck]

In message <c6o841$e0elh$1@ID-154333.news.uni-berlin.de>
"Graeme" <graeme@hotmail.com> wrote:

Thomson set-top box for UK freeview reception. Model DTI 1000.
This unit (not mine) keeps blowing its internal fuse. From what I've been
told, this only happens on power-up. The fuse that I've removed is a
standard 1A 20mm type. Does anyone know of the cause (is it typical for
this model), or what the recommended fuse rating/type should be (marking
on the circuit baord next to fuse is "T1AL")? ...

Dunno about the 'L', but the 'T' prefix is 'Time-delay': by 'normal' you
may mean what's also known as 'quickblow' or 'F' to distinguish them
from 'T'.

'T' fuses allow much higher than the rated current for a brief time
(achieved by winding the fuse on a core of relatively high thermal
inertia), but only the rated current continuously.

Such fuses are very usual in equipment that has a high starting-current,
e.g. to charge-up the capacitors in now-nearly-ubiquitous switch-mode
power supplies (plus, in a TV/monitor, the degaussing current).

Readily available from e.g. Maplins, or probably any local TV
sales/service place.

--
Peter Duck <pduck@zetnet.co.uk>

 

[Graeme]

"Peter Duck" <pduck@zetnet.co.uk> wrote in message
news:2004042901015572121@zetnet.co.uk...

In message <c6o841$e0elh$1@ID-154333.news.uni-berlin.de
"Graeme" <graeme@hotmail.com> wrote:

Thomson set-top box for UK freeview reception. Model DTI 1000.
This unit (not mine) keeps blowing its internal fuse. From what I've
been
told, this only happens on power-up. The fuse that I've removed is a
standard 1A 20mm type. Does anyone know of the cause (is it typical for
this model), or what the recommended fuse rating/type should be (marking
on the circuit baord next to fuse is "T1AL")? ...

Dunno about the 'L', but the 'T' prefix is 'Time-delay': by 'normal' you
may mean what's also known as 'quickblow' or 'F' to distinguish them
from 'T'.

'T' fuses allow much higher than the rated current for a brief time
(achieved by winding the fuse on a core of relatively high thermal
inertia), but only the rated current continuously.

Such fuses are very usual in equipment that has a high starting-current,
e.g. to charge-up the capacitors in now-nearly-ubiquitous switch-mode
power supplies (plus, in a TV/monitor, the degaussing current).

Readily available from e.g. Maplins, or probably any local TV
sales/service place.

Thanks for the reply. On further examination of the blown fuse, it also says
T1AL. So I guess that was the correct type.

 

[Graeme]

Thanks.
I'll check to see how much service by Thomson would cost. It's only Ł60 new.
It had been sent for repair before, and all the repair shop did was change
the fuse.

"David" <dkuhajda@locl.net> wrote in message
news:68f82f5b.0404281353.2df610a@posting.google.com...

Send it out for service to Thomson. Even here in the US the set top
boxes have ZERO information or parts available, they must be shipped
to the manufacture as they are keeping tight lids on the technology
used.

David

"Graeme" <graeme@hotmail.com> wrote in message
news:<c6o841$e0elh$1@ID-154333.news.uni-berlin.de>...
Thomson set-top box for UK freeview reception. Model DTI 1000.
This unit (not mine) keeps blowing its internal fuse. From what I've
been
told, this only happens on power-up. The fuse that I've removed is a
standard 1A 20mm type. Does anyone know of the cause (is it typical for
this
model), or what the recommended fuse rating/type should be (marking on
the
circuit baord next to fuse is "T1AL")? There are no obvious damaged
components inside.
Thanks.

 

[L. Fiar]

"Graeme" <graeme_dontreplyhere@hotmail.com> wrote in message
news:c6q7jp$e76ct$1@ID-154333.news.uni-berlin.de...

Thanks.
I'll check to see how much service by Thomson would cost. It's only Ł60
new.
It had been sent for repair before, and all the repair shop did was change
the fuse.

Some years back, when I was in TV servicing, there was a TV that was known
for popping the fuse after some time of use, I believe it was a certain
Samsung model.
The standard repair was to fit a slightly higher fuse, as the manufacturer
had slightly under-rated it. A fuse that is run on it's limit will usually
sag, and die over a period of time.

I assume that the repair shop you name at least tested the set before
returning it, how long does the set last before the replacement fuse pops?

Have you done a Google search for specific info, whether this fuse is
becoming a common problem now as the sets reach a certain age?


LF.

 

[Graeme]

"L. Fiar" <_@_._> wrote in message news:409360d4.0@entanet...

"Graeme" <graeme_dontreplyhere@hotmail.com> wrote in message
news:c6q7jp$e76ct$1@ID-154333.news.uni-berlin.de...
Thanks.
I'll check to see how much service by Thomson would cost. It's only Ł60
new.
It had been sent for repair before, and all the repair shop did was
change
the fuse.

Some years back, when I was in TV servicing, there was a TV that was known
for popping the fuse after some time of use, I believe it was a certain
Samsung model.
The standard repair was to fit a slightly higher fuse, as the manufacturer
had slightly under-rated it. A fuse that is run on it's limit will usually
sag, and die over a period of time.

I assume that the repair shop you name at least tested the set before
returning it, how long does the set last before the replacement fuse pops?

Have you done a Google search for specific info, whether this fuse is
becoming a common problem now as the sets reach a certain age?

Thanks for the feedback.

The repair shop (which is also the place where it was purchased) apparently
did test the unit after changing the fuse. I don't have too many details
about the exact history as this unit belongs to a friend, and I can't say
how long a new fuse lasts. I do know that the shop no longer exists now.

I did google for problems with this box, but haven't found anything similar.
I also emailed Thomson.

At the moment it's running with a 2A fuse.