Toshiba TV29C90 problem; Image fades to black...

"Marcus" <asif@getreal.com> wrote in message
news:bmb2rn$hm3$1@newsg1.svr.pol.co.uk...
Hi all,

I am in the UK (but would buy from anywhere) and trying to get hold of a
Sanyo STK51427A to repair a PSU in a much loved old Goldstar 8mm/VHS edit
VCR.

This hybrid was in still use in 1994/1995, it is obsolete now and can not
get a data sheet off the Sanyo semicon website even. Found two with a big
US
chip supply company but there min. order value is $500 !!!.

Any ideas where to get one from, thank you for any assistance you can
offer.

--
Regards
Marcus
Click to expand...
http://eshop.euras.com/default.asp lists the STK51247, but how this varies
from the 'A' version I don't know. It shows a price of 66 Euros, but I'm not
sure if they can still get it. The site's in German and my German is very
basic. One bit says delivery time 2 - 3 weeks, but another bit says
discontinued.

Hopefully you can find someone who understands German to help you through
the website.

Sorry I can't help any further.
 
Nigel, many thanks for your help. I will follow this up, you are a star.

--
Regards
Marcus
 
Maybe you can find a similar VCR on Ebay that has something else wrong with
it, I did that a while back with an old NEC.

"Marcus" <asif@getreal.com> wrote in message
news:bmb2rn$hm3$1@newsg1.svr.pol.co.uk...
Hi all,

I am in the UK (but would buy from anywhere) and trying to get hold of a
Sanyo STK51427A to repair a PSU in a much loved old Goldstar 8mm/VHS edit
VCR.

This hybrid was in still use in 1994/1995, it is obsolete now and can not
get a data sheet off the Sanyo semicon website even. Found two with a big
US
chip supply company but there min. order value is $500 !!!.

Any ideas where to get one from, thank you for any assistance you can
offer.

--
Regards
Marcus
Click to expand...
 
Huh?

"Jerry G." <jerryg50@hotmail.com> wrote in message
news:bmu0lh$qfb$1@news.eusc.inter.net...
--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================
Click to expand...
 
Bob Parker <bobp@bluebottle.com> writes:

"James Sweet" <jamessweet@hotmail.com> wrote:

Huh?

That's what I thought, too. :-|
Bob
Click to expand...
Probably a virus got hold of an email list with Jerry's email address in it.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
The Display or menu screen has been disabled.....Can anyone help me with
this one.......I can't seem to find out where it has been modified. It is
a sony KV32SXR10.

Thanks
 
The Display or menu screen has been disabled.....Can anyone help me with
this one.......I can't seem to find out where it has been modified. It is
a sony KV32SXR10.

Thanks
 
Two Aerials meet on a roof - fall in love - get married. The ceremony
was rubbish but the Reception was Brilliant.
 
heheh

"Ronie" <rf@somewhereovertherainbow.com> wrote in message news:3f9e219e$1@clear.net.nz...
Two Aerials meet on a roof - fall in love - get married. The ceremony
was rubbish but the Reception was Brilliant.
 
did they have a romantic walk over the wieghtstone bridge
and flux'd allnight (thats rude isn'it)
"Ronie" <rf@somewhereovertherainbow.com> wrote in message news:3f9e219e$1@clear.net.nz...
Two Aerials meet on a roof - fall in love - get married. The ceremony
was rubbish but the Reception was Brilliant.
 
Zounds like a Real Twisted Pair, Eh!!! LOL
"Ronie" <rf@somewhereovertherainbow.com> wrote in message news:3f9e219e$1@clear.net.nz...
Two Aerials meet on a roof - fall in love - get married. The ceremony
was rubbish but the Reception was Brilliant.
 
Doug wrote:
I have about a 10 year old 55 inch Toshiba TP5580 and it works fine
and has beautiful picture. Only problem that I am having is that Once
in a while the screen goes Red and has some Vertical lines and then
about 5 seconds after that it shuts off. If you unplug it and plug it
back in it works. This is random. I have cleaned contacts on all of
the tubes thinking there may be a dirty or loose connection and on the
main board. Nothing looks bad on the board and it is really clean
inside. Not sure where to start actually troubleshooting, I do have
the schematics for the TV from a problem that I had to fix before.
Any Ideas. Please let me know.
Click to expand...
Well, the set is shutting off according to a 'protection' circuit. You
could start by identifying the over-voltage/current protection circuits
and determining just what will force a shutdown through them.
Specifically with regard to Arthur's suggestions of fault points.

Kalo
 
Sounds to me like either the red CRT is shorting, or else losing the 200v;
either will give a bright red screen with retrace lines. The set's protect
circuits sense the current draw and shut the set down.
 
"Rich Dzidek" <richard,dzidek[at]baesystems,com> wrote in
news:3fb3bdc4$1@baen1673807.greenlnk.net:

"Quentin Stephens" <quentin.stephens@baesystems.com> wrote in
message news:Xns9432853183BB9qtsbaesystems@10.15.188.42...

If they accept the goods were faulty I want them REPLACE or
REFUNDED now.

Speak to Trading Standards.

But it's outside of the warranty now...
Click to expand...
So what?


--
QS/CSC Stanmore Desktop/Network Support
Tel: 0208 420 3977
 
EU Law is TV tube should be gauranteed for 2yrs.

--
Gerry aka (The MOTH)
SG1 Edinburgh

'Time is short. Life is cruel. Its up to us to change, this town called
malice'
"Rich Dzidek" <richard,dzidek[at]baesystems,com> wrote in message
news:3fb3bdc4$1@baen1673807.greenlnk.net...
"Quentin Stephens" <quentin.stephens@baesystems.com> wrote in message
news:Xns9432853183BB9qtsbaesystems@10.15.188.42...

If they accept the goods were faulty I want them REPLACE or
REFUNDED now.

Speak to Trading Standards.

But it's outside of the warranty now...
Click to expand...
 
On Thu, 13 Nov 2003 13:33:46 -0000, "Alex Brown" <alex.brown@baesystems_com>
rearranged the phosphor to say:

Fortunately, mine's been absolutely faultless in the 6 years that i've owned
it. If i wasn't going to plasma / projector in the next couple of years
then i'd have another...........sorry that yours appears to be shite with an
equally shite backup service.
Click to expand...
Ditto - mine has given excellent service and looks great.

--
Justin

"It's not who wants to sleep with you; It's who wants to sleep with
you again."

http://galadriel.broadoak.portsmth.gecm.com/~jtk/
AMS, Broad Oak : GNET +841-5099
 
"Rich Dzidek" <richard,dzidek[at]baesystems,com> wrote in message
news:3fb49ca7@baen1673807.greenlnk.net...
"Quentin Stephens" <quentin.stephens@baesystems.com> wrote in message
news:Xns94335E1156469qtsbaesystems@10.15.188.42...

Speak to Trading Standards.

But it's outside of the warranty now...

So what?

So it's no longer covered!?

Not necessarily. The application of a warranty is determined by when the
Click to expand...
fault appeared, not when you get it repaired. You are probably not entitled
to replacement or refund, once a reasonable time has passed. You are
entitled to a free repair.

Ian S
 
I think Sophie is right. I've seen this problem quite a few times. I worked
in Post Production for several years as a graphic artist. One of my jobs
included cleaning several Sony Betacam SP machines. If a good cleaning (Drum
pinch rollers, capstand, guides ETC) didn't fix the problem a service person
was called in. Quite often a service person had to disassemble the drum,
clean or replace a head and the problem you described went away. Betcam SP
machines are a different animal, but the problem is the similar as it was
normal for one of these machines to produce a fussy line at either the top
or bottom of the screen. Also keep in mind that the machines I described
were used, as a new Betacam SP (recorder, editor) was around $10,000 You
might want to try Acetone for cleaning metal, it works better than isopropyl
alcohol, just don't touch plastic or rubber as it will melt them, for
materials other then metal use isopropyl alcohol 100%, not this half and
half stuff you can get at the drug store.
Hope this helps
Mike


"Sofie" <sofie@olypen.com> wrote in message
news:v41gd0ahoohvd5@corp.supernews.com...
Rene:
Are you absolutely certain that the A/C head is CLEAN. This is the head
assembly right before the pinch roller and capstan. The bottom head on
the
assembly is responsible for picking up the control track signal from the
tape and if it has gunk or build-up on it that may be causing your
tracking
difficulties..... clean it real good with isopropyl alcohol and a Q
tip.....
a visual inspection after cleaning will help you confirm that it is clean.
If in doubt, clean it again.... and again. Unlike the delicate rotating
video heads on the upper drum, you can use moderate pressure with a Q tip
without damaging the stationary heads on the A/C head assembly.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


"Rene" <renora@rogers.com> wrote in message
news:2RY%9.557311$F2h1.31720@news01.bloor.is.net.cable.rogers.com...
Additional information:

I watched the tape as it loads and as it travels its serpentine path.
Everything looks steady, no sign of tape edge crumpling, vibrating, nor
getting out of the lower cylinder ridge.

Also when I used a Fujifilm brand of S-VHS tape, I somewhat can record
and
playback but the quality is nowhere close to my 6 year old 2 head VCR.
The
top or bottom of the screen (depending on tracking manipulation)
displays
a
multicolor band.
"Rune Isaksen" <rune.isaksen@telia.com> wrote in message
news:5GS%9.9167$FF4.566514@newsb.telia.net...

"Sofie" <sofie@olypen.com> skrev i meddelandet
news:v3vo593ecd4e56@corp.supernews.com...
Rune Isaksen:
cc: Rene
Certainly could be the pressure (pinch) roller.... but not
necessarily
"nothing else."

In This case, nothing else.
/Rune
Click to expand...
 
One special note. When you remove the old convergence ic's, completely
remove the old heatsink compound and reapply an air tight thin coating of
heatsink compound to the new ic's. Make sure they are firmly attached to
the heatsinks.

Be very careful not to damage or overheat the circuit boards when removing
the old parts. Sony boards tend to be easily damaged and lift the circuit
traces.

David

Mirek Chmiel <mirekc@yahoo.com> wrote in message
news:3fb80cf5$0$9745$afc38c87@...
This TV is about 7 years old. About 2 years ago it had similar problem. At
that time, we had a local company fix it. On the bill, they stated
replacement of one transistor. Unfortunately, I don't have that info
anymore
to specify which one.
This time, I did google search on this problem and found much useful info.
The purpose for this email is to further pinpoint the root cause of my
problem.
For a couple of weeks, while TV was warming up, I did notice short picture
problems. For a fraction of a second the picture would be distorted.
Because
of a short duration, I couldn't tell exactly what the distortion was.
Yesterday my family told me, that there was a problem with TV. I couldn't
immediately check it out so can't say, if this was instantaneous or not.
When I finally looked at it, I saw a pincushion problem. Today I replaced
F902 fuse and for a short while, everything is OK. After few seconds
(10-20)
the red color fails and, on the convergence screen, it moves off half of
the
screen to the left. Blue is still pretty good. At this time, I can smell a
burning component and I turn the TV off. After checking for hot
components,
I did notice, that the top STK is hot.

At this time, I'll follow the advice from David Kuhajda from 2000/06/09
for
a Sony RPTV KP-41EXR96 :
If the fuse is blowing, even intermittently you need to Replace both STK
convergence output ic's, check all the low ohm resistors in the
convergence
output circuit. Then check the vertical output ic and the 2 small fusible
resistor to the vertical ic, typically when one of the convergence ic's
starts
to go it opens up the fuse, which unbalances the voltage to the vertical
ic,
if
it is not bad now, it will likely fail within the next month. I had 3 in
a
row
that got 2 convergence ic's and a fuse, only to have the vertical ic fail
within
a month later, so we now replace the vertical ic whenever either the +15v
or
-15v fuse opens up, order the ic by number from MCM or other generic parts
distributor, as well as the stk outputs, Sony wants way too much for these
high
volume parts, and they buy them from the other manufacture as well.
David

If anyone has any additional info/advice please let me know.

Thank you.

Mirek
Click to expand...
 
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