Daewoo DS608P - is fault due to C101 cap??

wrote in message
oups.com...
Alan - thanks for info. I am using the RF modulator and a manual TV -
its just a B&W "menu" screen and no signal detected when scans.

I have now looked inside both the Daewoo and Labgear.

Daewoo (powers up OK with red/green LED /no signal found/B&W output) :
Cap C101 has a "flat" top BUT IC101 which is near C101 has a brown
colouration on the PCB surrounding all 8 pins (its a 5H02659R). I
think this might be due to excess heat - but could just be normal?
Also, the green base on the "middle" PCB appears very dull and patchy
- looks a bit like water damage? There is also some light rusting
around the tuner screening and the back of the coax sockets. Maybe the
Daewoo was stored in a damp environment?

Assuming the brown colouration around IC101 is OK , then hopefully the
PSU is OK

Labgear (completely dead) : as already mentioned , cap C101 has a
"domed" top so must be duff!! IC101 is different from the Daewoo - its
a 4 pin 5L0265R mounted vertical to the board (like a voltage reg).
There is some very light brown colouration around the PCB holes but
you have to look carefully - nothing like the Daewoo where the brown
marking spreads all around IC101 - although the body of the Labgear
IC101 is raised on its legs above the PCB whereas the Daewoo IC101 is
resting on the PCB.


AIUI you've got two' identical' receivers, one working but presumably with a
dud tuner, and the other one not showing very much in the way of signs of
life, so there is a reasonable assumption that its power supply might not be
working.

If they both have identical power supplies (not always the case) then it's
only a single plug from the ps into the main board, therefore logic would
dictate that you take the 'known' working power supply and plug it into the
dead receivers main board and see what happens.

Or conversely try unpluging the tuner board from the dead receiver and
pluging it into the one which can't find any channels, or perhaps you have
already tried these options and I am completely misunderstanding your
problem?... also there more than possibly, as I have previously pointed
out, both may boxes may well made up of all dud panels.



Any other thoughts?

Thanks


On 2 Aug, 18:00, (Alan
Pemberton) wrote:
wrote:
Any other thoughts as to why the DS608P is in B&W and no signals are
detected?

My first DS608P went 'pop' when I was playing about with an indoor
aerial in a dry, staticky environment. The rf input stage seems a bit
fragile.

Are you getting colour on the rf output? To tune it in, find a blank
channel on the telly, press the red button on the back of the Daewoo for
six seconds and wait. The modulator will step slowly through the 48
available channels. When it reaches the one on the telly, press Select
smartly.

The scart output is switchable between YUV, RGB and S-video, but in each
case the composite video pin carries PAL (it should carry only Y in
S-video and YUV, but the SetPal is non-standard. At least, mine is).

To enter the engineering menu press

Status
Select
Text
Text
Select

There are some handy colour bars on the last option (or first if you
work backwards).

--
Alan Pemberton
Sheffield, South Yorkshire, England
To e-mail me directly, please visit
http://www.pembers.freeserve.co.uk/index.html#Mail-me

On 2 Aug, 21:01, "Ivan" wrote:
wrote in message

oups.com...





Alan - thanks for info. I am using the RF modulator and a manual TV -
its just a B&W "menu" screen and no signal detected when scans.

I have now looked inside both the Daewoo and Labgear.

Daewoo (powers up OK with red/green LED /no signal found/B&W output) :
Cap C101 has a "flat" top BUT IC101 which is near C101 has a brown
colouration on the PCB surrounding all 8 pins (its a 5H02659R). I
think this might be due to excess heat - but could just be normal?
Also, the green base on the "middle" PCB appears very dull and patchy
- looks a bit like water damage? There is also some light rusting
around the tuner screening and the back of the coax sockets. Maybe the
Daewoo was stored in a damp environment?

Assuming the brown colouration around IC101 is OK , then hopefully the
PSU is OK

Labgear (completely dead) : as already mentioned , cap C101 has a
"domed" top so must be duff!! IC101 is different from the Daewoo - its
a 4 pin 5L0265R mounted vertical to the board (like a voltage reg).
There is some very light brown colouration around the PCB holes but
you have to look carefully - nothing like the Daewoo where the brown
marking spreads all around IC101 - although the body of the Labgear
IC101 is raised on its legs above the PCB whereas the Daewoo IC101 is
resting on the PCB.

AIUI you've got two' identical' receivers, one working but presumably with a
dud tuner, and the other one not showing very much in the way of signs of
life, so there is a reasonable assumption that its power supply might not be
working.

If they both have identical power supplies (not always the case) then it's
only a single plug from the ps into the main board, therefore logic would
dictate that you take the 'known' working power supply and plug it into the
dead receivers main board and see what happens.

Or conversely try unpluging the tuner board from the dead receiver and
pluging it into the one which can't find any channels, or perhaps you have
already tried these options and I am completely misunderstanding your
problem?... also there more than possibly, as I have previously pointed
out, both may boxes may well made up of all dud panels.



Any other thoughts?

Thanks

On 2 Aug, 18:00, (Alan
Pemberton) wrote:
wrote:
Any other thoughts as to why the DS608P is in B&W and no signals are
detected?

My first DS608P went 'pop' when I was playing about with an indoor
aerial in a dry, staticky environment. The rf input stage seems a bit
fragile.

Are you getting colour on the rf output? To tune it in, find a blank
channel on the telly, press the red button on the back of the Daewoo for
six seconds and wait. The modulator will step slowly through the 48
available channels. When it reaches the one on the telly, press Select
smartly.

The scart output is switchable between YUV, RGB and S-video, but in each
case the composite video pin carries PAL (it should carry only Y in
S-video and YUV, but the SetPal is non-standard. At least, mine is).

To enter the engineering menu press

Status
Select
Text
Text
Select
Thanks Ivan.

Is brown colouration on the PCB around IC101(5H02659R) on the "working
PSU" normal?

If so , I will try this PSU in the "dead" Labgear.

Thanks




There are some handy colour bars on the last option (or first if you
work backwards).

--
Alan Pemberton
Sheffield, South Yorkshire, England
To e-mail me directly, please visit
http://www.pembers.freeserve.co.uk/index.html#Mail-me- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

On 2 Aug, 21:29, wrote:
On 2 Aug, 21:01, "Ivan" wrote:



wrote in message

roups.com...

Alan - thanks for info. I am using the RF modulator and a manual TV -
its just a B&W "menu" screen and no signal detected when scans.

I have now looked inside both the Daewoo and Labgear.

Daewoo (powers up OK with red/green LED /no signal found/B&W output) :
Cap C101 has a "flat" top BUT IC101 which is near C101 has a brown
colouration on the PCB surrounding all 8 pins (its a 5H02659R). I
think this might be due to excess heat - but could just be normal?
Also, the green base on the "middle" PCB appears very dull and patchy
- looks a bit like water damage? There is also some light rusting
around the tuner screening and the back of the coax sockets. Maybe the
Daewoo was stored in a damp environment?

Assuming the brown colouration around IC101 is OK , then hopefully the
PSU is OK

Labgear (completely dead) : as already mentioned , cap C101 has a
"domed" top so must be duff!! IC101 is different from the Daewoo - its
a 4 pin 5L0265R mounted vertical to the board (like a voltage reg).
There is some very light brown colouration around the PCB holes but
you have to look carefully - nothing like the Daewoo where the brown
marking spreads all around IC101 - although the body of the Labgear
IC101 is raised on its legs above the PCB whereas the Daewoo IC101 is
resting on the PCB.

AIUI you've got two' identical' receivers, one working but presumably with a
dud tuner, and the other one not showing very much in the way of signs of
life, so there is a reasonable assumption that its power supply might not be
working.

If they both have identical power supplies (not always the case) then it's
only a single plug from the ps into the main board, therefore logic would
dictate that you take the 'known' working power supply and plug it into the
dead receivers main board and see what happens.

Or conversely try unpluging the tuner board from the dead receiver and
pluging it into the one which can't find any channels, or perhaps you have
already tried these options and I am completely misunderstanding your
problem?... also there more than possibly, as I have previously pointed
out, both may boxes may well made up of all dud panels.

Any other thoughts?

Thanks

On 2 Aug, 18:00, (Alan
Pemberton) wrote:
wrote:
Any other thoughts as to why the DS608P is in B&W and no signals are
detected?

My first DS608P went 'pop' when I was playing about with an indoor
aerial in a dry, staticky environment. The rf input stage seems a bit
fragile.

Are you getting colour on the rf output? To tune it in, find a blank
channel on the telly, press the red button on the back of the Daewoo for
six seconds and wait. The modulator will step slowly through the 48
available channels. When it reaches the one on the telly, press Select
smartly.




Success!!! I switched the PSU from the "no signal" Daewoo into the
"dead" Labgear.

Labgear now works - so, as expected, it was a duff C101 in the Labgear
PSU. As well as the "domed" top of the C101 cap , there also appeared
to be electrolyte on the reverse of the PCB around the C101 solder
joints. The Labgear dates from 2002 and last did a software scan on
6th June 2006 - so its been duff for over a year. I look forward to
seeing the "engineers" who knowingly sold me the duff boxes at the car
boot - I'll ask for a partial refund as only one was working!!

I guess the "no signal" Daewoo has a duff front end device. Although
I'm not sure why the Menu screen is in B&W.

Cheers all







--
Alan Pemberton
Sheffield, South Yorkshire, England
To e-mail me directly, please visit
http://www.pembers.freeserve.co.uk/index.html#Mail-me- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Success!!! I switched the PSU from the "no signal" Daewoo into the
"dead" Labgear.

Labgear now works - so, as expected, it was a duff C101 in the Labgear
PSU. As well as the "domed" top of the C101 cap , there also appeared
to be electrolyte on the reverse of the PCB around the C101 solder
joints. The Labgear dates from 2002 and last did a software scan on
6th June 2006 - so its been duff for over a year. I look forward to
seeing the "engineers" who knowingly sold me the duff boxes at the car
boot - I'll ask for a partial refund as only one was working!!

I guess the "no signal" Daewoo has a duff front end device. Although
I'm not sure why the Menu screen is in B&W.

Cheers all


Thanks for the tips on the common Daewoo fault.
I dug out my faulty box yesterday and replaced C101 with 47 mF 450 V cap and
it's sprung back to life!
My daughter will be pleased.

Now to get the other faulty box going - a Digifusion FRT100. Wonder what the
common fault on this one is?

Thanks again,
Eddie

Alan Pemberton wrote:

It's not 'normal', but it's what you get! Ivan is the expert on SetPal
repairs and as he has joined the thread he'll be able to offer more
help.

Oooo, Er... Ivan!, If you are looking here, can you offer some advice on
*directly* flashing upto date firmware on these boxes? Hidden JTAG port
or something?



--
Adrian C

On Sun, 5 Aug 2007 19:14:42 UTC, Adrian C wrote:

Alan Pemberton wrote:

It's not 'normal', but it's what you get! Ivan is the expert on SetPal
repairs and as he has joined the thread he'll be able to offer more
help.

Oooo, Er... Ivan!, If you are looking here, can you offer some advice on
*directly* flashing upto date firmware on these boxes? Hidden JTAG port
or something?

Well mine, posted under "Daewoo Dead" a couple of weeks back, seems to
have a totally different PSU board to the ones discussed here. An
engineer friend replaced several bits on the PSU, this one at least is
*not* switched mode, and got power back - but it is very much in dodo
mode now. :-)

On power on either no lights, the green light or both at once. Reset
button does nowt. No output to the TV and it
can't see the remote - which *is* OK - checked with my digital camera.

Someone was asking in the other thread for the remote - Please
contact.

--
Regards
Dave Saville

NB Remove -nospam for good email address

Alan - thanks for the info and zenar tip

The "working" Daewoo has the latest firmware version 0157. This is the
same as my original fully working Daewoo.

As with my original Daewoo , the "fixed" Daewoo does crash when I am
rapidly surfing across channels. I previously found that the fix is
just to switch off the MHEG (teletext) feature - very stable
afterwards!!

So, if you want they latest firmware , it might not necessarily be
very stable!! I think when Tesco's sold a batch of "old" DS608's last
year (I guess they were refurbs) , firmware 0156 (not 0157) was
installed (I think).

I have "another" DS608 which only has firmware 0060 (I think). It does
not have the volume up/down feature and is missing some info on the
screen displays - but its very stable even with MHEG enabled.





On 6 Aug, 16:25, "Dave Saville" wrote:
On Sun, 5 Aug 2007 19:14:42 UTC, Adrian C wrote:
Alan Pemberton wrote:

It's not 'normal', but it's what you get! Ivan is the expert on SetPal
repairs and as he has joined the thread he'll be able to offer more
help.

Oooo, Er... Ivan!, If you are looking here, can you offer some advice on
*directly* flashing upto date firmware on these boxes? Hidden JTAG port
or something?

Well mine, posted under "Daewoo Dead" a couple of weeks back, seems to
have a totally different PSU board to the ones discussed here. An
engineer friend replaced several bits on the PSU, this one at least is
*not* switched mode, and got power back - but it is very much in dodo
mode now. :-)

On power on either no lights, the green light or both at once. Reset
button does nowt. No output to the TV and it
can't see the remote - which *is* OK - checked with my digital camera.

Someone was asking in the other thread for the remote - Please
contact.

--
Regards
Dave Saville

NB Remove -nospam for good email address

On 5 Aug, 12:28, "Eddie G0EHV" wrote:
Success!!! I switched the PSU from the "no signal" Daewoo into the
"dead" Labgear.

Labgear now works - so, as expected, it was a duff C101 in the Labgear
PSU. As well as the "domed" top of the C101 cap , there also appeared
to be electrolyte on the reverse of the PCB around the C101 solder
joints. The Labgear dates from 2002 and last did a software scan on
6th June 2006 - so its been duff for over a year. I look forward to
seeing the "engineers" who knowingly sold me the duff boxes at the car
boot - I'll ask for a partial refund as only one was working!!

I guess the "no signal" Daewoo has a duff front end device. Although
I'm not sure why the Menu screen is in B&W.

Cheers all

Thanks for the tips on the common Daewoo fault.
I dug out my faulty box yesterday and replaced C101 with 47 mF 450 V cap and
it's sprung back to life!
My daughter will be pleased.

Now to get the other faulty box going - a Digifusion FRT100. Wonder what the
common fault on this one is?


Problem with the 5v Rail

See here for cures.

http://www.digitalspy.co.uk/forums/s...d.php?t=316192

"Adrian C" wrote in message
...
Alan Pemberton wrote:

It's not 'normal', but it's what you get! Ivan is the expert on SetPal
repairs and as he has joined the thread he'll be able to offer more
help.

Oooo, Er... Ivan!, If you are looking here, can you offer some advice on
*directly* flashing upto date firmware on these boxes? Hidden JTAG port or
something?



Contrary to what Allan has suggested I'm certainly no expert! except that
(before my enforced retirement) I sold a reasonable number of these
receivers at the beginning of the Freeview service.

Other than C101 and several tuners which have been taken out by static
during a thunderstorm (as Alan has pointed out, they seem very susceptible
to static) they have proved to be very reliable.

Also as I lived in an area where the green screen of death (as it was known)
was a problem they supplied me with some software and a modified receiver to
connect to a computer which would record the actual moment of the 'green
death', my task was to then email the data so that they could attempt to
analyse what was happening...the fault could sometimes be provoked by
changing channels in a certain sequence.

One of the engineers was going to furnish me with a schematic of the power
supplies, which as the only really serviceable part of the receiver would
have been very useful, but unfortunately it appears that the company ceased
to exist before I was able to acquire it.

I've compiled a few photos of various bits and pieces here.

http://picasaweb.google.co.uk/Ivan230542/SetpalPhotos?authkey=35HHNYnzT3g




--
Adrian C

"Alan Pemberton" wrote in message
rve.co.uk.invalid...
wrote:

So, if you want they latest firmware , it might not necessarily be
very stable!! I think when Tesco's sold a batch of "old" DS608's last
year (I guess they were refurbs) , firmware 0156 (not 0157) was
installed (I think).

0156 was more stable than 0157.

It is possible to switch between the two (assuming they are the two that
are in memory) via the engineering menu. Note that if the older version
is very old (I don't know which version it applies to) you cannot then
switch back to the later version.

But the menu warns you of this when it tells you which version you are
about to change back to.

A bit off topic Alan, on your web page about Teletext, the screen shot which
shows your name also has the name of 'Bob McGregor' at the top of the list,
I knew Bob and can (remember him building that particular Wireless World
Teletext decoder (an awful lot of hard wired 74 TTL ICs IIRC).

I haven't seen or heard of him in well over 20 years, but who knows he may
still be alive and well and contributing to Usenet )



--
Alan Pemberton
Sheffield, South Yorkshire, England
To e-mail me directly, please visit
http://www.pembers.freeserve.co.uk/index.html#Mail-me