Toshiba TV29C90 problem; Image fades to black...

[Bob Fisk]

Some quality distributors here in the UK have been affected by fake semis as
I had the unfortunate luck to buy some, and they weren't what I'd call dirt
cheap either.
In my case though an Email to the company was all it needed for them to
re-supply me with a different brand which were bona fide.

Bob

"RonKZ650" <RonKZ650@aol.com> wrote in message
news:1113095921.846941.259800@z14g2000cwz.googlegroups.com...

I saw one today, on I-80, a simple Ford dressed as a Freightliner.
Luckily the checkstation entering Michigan caught the guy and impounded
the truck. Can't have these fake Semis roaming the streets. Seriously
though, I've never had a fake transistor because I know my parts
distributers. Don't buy crap that normally costs $10 for $2 at some of
these "discount* places or this will happen.

 

[Sam Goldwasser]

"Nexus7" <ac25kV@yahoo.com> writes:

Sam Goldwasser wrote:
"Nexus7" <ac25kV@yahoo.com> writes:
Bill Renfro wrote:
Why do you have 3 GFCI outlets on the same circuit? Only the
first
I figured if I did it that way, diagnosing a trip or other
condition
So, now you will have some random combinatino of GFCIs tripping,
rather
than only one.
Realize that there is no guarantee that only the GFCI at the affected
outlet will trip!

I haven't been very clear in my wording, but the GFCIs are fed from the
same breaker. However they are in parallel across this set of wires,
and they connect to the wires only at the 'Line' terminals, not the
'Load' ones. I think in this situation each should trip iff there is a
leakage associated with the load connected to itself only.

Yes, that's correct.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
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traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

 

Bob Fisk <bob@bfisk.demon.co.uk> wrote:

Some quality distributors here in the UK have been affected by fake semis as
I had the unfortunate luck to buy some, and they weren't what I'd call dirt
cheap either.
In my case though an Email to the company was all it needed for them to
re-supply me with a different brand which were bona fide.

With my distributor, I can make my own choice. When they stock fakes, it
is clearly indicated in the part-number. A fake or off-brand 30 cent
BU2520AX is good enough to substitute for a 1 euro original BU2508AX...
I would never try to use it in place of a real BU2520, though.

---
Met vriendelijke groet,

Maarten Bakker.

 

[Ron(UK)]

maarten@panic.xx.tudelft.nl wrote:

Bob Fisk <bob@bfisk.demon.co.uk> wrote:

Some quality distributors here in the UK have been affected by fake semis as
I had the unfortunate luck to buy some, and they weren't what I'd call dirt
cheap either.
In my case though an Email to the company was all it needed for them to
re-supply me with a different brand which were bona fide.


With my distributor, I can make my own choice. When they stock fakes, it
is clearly indicated in the part-number. A fake or off-brand 30 cent
BU2520AX is good enough to substitute for a 1 euro original BU2508AX...
I would never try to use it in place of a real BU2520, though.

---
Met vriendelijke groet,

Maarten Bakker.

I think he means fake as in that they are not the device indicated on
the package. often a cheap bipolar transistor of a few pennies,
illegally masquarading as a very expensive chopper transistor and not
suitable in the slightest for the intended purpose. It,s becoming more
and more of a problem with TV PSU transistors and dedicated i.c`s.


Ron(UK)

 

[Shawn D'Alimonte]

captainvideo462002@yahoo.com wrote:

And then if not how do I get into bios? (I would like to know this anyway).

Try holding down any key during boot. Many BIOSs will see that as a
keyboard failure and may offer to enter setup.

 

[Tom]

As Shawn D'Alimonte so eloquently stated:

captainvideo462002@yahoo.com wrote:
And then if not how do I get into bios? (I would like to know this
anyway).

Try holding down any key during boot. Many BIOSs will see that as a
keyboard failure and may offer to enter setup.

Where's the 'any key'??? LOL

Had to be said...might as well be me. ;-)
--
Tom

"That man is richest whose pleasures are cheapest."
-Henry Thoreau

"The original point and click interface is a Smith and Wesson"

 

[Tom MacIntyre]

On 12 Apr 2005 20:59:22 -0700, dave21108@aol.com wrote:

Got A view sonic moniter A70F that the picture is sharp as can be.
about 45sec later at the snap of a finger way out of focus. then about
a min later sharp as can be again. instant out and in of focus. does
this cold or hot all day. not a bad solder joint for hitting/tapping
the moniter does nothing. not a slow drift its instent. any clue???. I
would like to fix it not buy a new one. any clue Guys.

Thanks for any help or idea you guys may have.

DAVE

The glue holding the focus pot may have let go, allowing the pot to
wiggle a bit.

Tom

 

[James Sweet]

No matter whether the mains frequency was used as a reference or not,
and no matter whether a micro is used or not, when mains is
disconnected the only way to maintain correct time is by using a
battery backed xtal locked clock. However, it doesn't make sense to
provide both mains AND xtal locked clocks with automatic selection of
either depending upon whether mains is connected or not. Surely, if
the xtal controlled clock was included that method would always be
used to provide the time since it would have to be running all the
time no matter whether mains is connected or not. Just like in PC...

Why doesn't it? I've used that feature on a microprocessor based clock I
built, it's just a matter of having code that syncronizes timekeeping to the
AC line when present, and if that goes away it uses a timer interrupt driven
by the CPU's crystal oscillator. The benefit is rock solid long term
timekeeping (better than any crystal oscillator) when power is present
combined with backup that's reasonably accurate for short outages with no
added hardware other than a resistor and capacitor for the AC sync. I've
seen other designs that even autoselect between 50 and 60 Hz, again just
coding, no hardware change. Modern microcontrollers tend to have vast
amounts of memory for what they typically need, there's usually extra space
for cool features like this.

*Many* clock radios and other digital clocks use a very similar arrangement
though most of them use a simple R/C oscillator for the battery backup.

 

[Franc Zabkar]

On 13 Apr 2005 08:13:36 -0700, "captainvideo462002@yahoo.com"
<captainvideo462002@yahoo.com> put finger to keyboard and composed:

I have a Twinhead laptop with the following markings: Slimnote 486SLC.
The bios information that comes up on boot is as follows:

CL-G6410VGA Bios Version 2.10C
Copyright 1992 Cirrus Logic Inc, All Rights Reserved
Copyright 1987-1990 Quadtel Corp, All rights reserved

Phoenix Bios (TM) A386 Version 1.01
Copyright (C) 1985-1991 Phoenix Technologies LTD
All rights reserved

Phoenix Bios for VLSI 82C310/82C312
80486LC Bios version 1.1, 11/22/93 All rights reserved
THAPM bios for VLSI 82C310/312 Version 1.20

Try Ctrl-Alt-S or Ctrl-Alt-Esc


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[Lee Babcock]

captainvideo462002@yahoo.com wrote:

I have a Twinhead laptop with the following markings: Slimnote 486SLC.
The bios information that comes up on boot is as follows:

CL-G6410VGA Bios Version 2.10C
Copyright 1992 Cirrus Logic Inc, All Rights Reserved
Copyright 1987-1990 Quadtel Corp, All rights reserved

Phoenix Bios (TM) A386 Version 1.01
Copyright (C) 1985-1991 Phoenix Technologies LTD
All rights reserved

Phoenix Bios for VLSI 82C310/82C312
80486LC Bios version 1.1, 11/22/93 All rights reserved
THAPM bios for VLSI 82C310/312 Version 1.20

Doing a system info using "Checkit" shows that the Rom bios is Phoenix
and the date is 4/19/90
The processor is identified as a 80386AT machine (A20 active),
(Protected)
Note: The diagnostic program I used, (Checkit) is rather old so it
could be mistakenly identifying this machine as a 386 when it is in
fact a 486 but that is not my concern. The machine has a VGA accessory
jack in the back so that I'm assuming you can connnect a VGA monitor to
it. I never tried to do this until today and found that it will not
work. You do see some raster changes taking place on the monitor during
bootup but you never get a display. I was thinking that perhaps I might
have to go into bios and tell the machine that it is outputing to an
external display rather than the LCD one? If so that calls for two
questions. Should I be able to get a simultaneous display on the laptop
as well as the external monitor? And then if not how do I get into
bios? (I would like to know this anyway). I have tried Delete, Alt,
Cont Z , C, F1 every combination that I could think of and nothing
works. You see, I need to connect up a video projector that came in for
repair to this laptop and need to determine that it will produce a
normal display on a VGA monitor first. Any assistance with this problem
will be greatly appreciated.
Lenny Stein, Barlen Electronics

Lenny...... your machine is in fact a 386. The SLC chip was made by
Cyrix, a little thing about three quarters of an inch square and it went
like stink (for its time). They usually had an oversize heat sink as
they ran very hot.
Most early Phoenix Bios were accessable ONLY with a bios change program.
There are (read... used to be) lots of freeware stuff out there for this.
BTW, the bios program for the 286/386 Compaq's will usually work on this.
As for the VGA port, I think you will find it is an EGA. Same socket,
different pinning.
I think that TI actually made these machines for Twinhead.
This link may help on the BIOS

http://www.dewassoc.com/support/bios/awardfaq.htm

Regards
Lee in Toronto

 

[Jamie]

captainvideo462002@yahoo.com wrote:

I have a Twinhead laptop with the following markings: Slimnote 486SLC.
The bios information that comes up on boot is as follows:

CL-G6410VGA Bios Version 2.10C
Copyright 1992 Cirrus Logic Inc, All Rights Reserved
Copyright 1987-1990 Quadtel Corp, All rights reserved

Phoenix Bios (TM) A386 Version 1.01
Copyright (C) 1985-1991 Phoenix Technologies LTD
All rights reserved

Phoenix Bios for VLSI 82C310/82C312
80486LC Bios version 1.1, 11/22/93 All rights reserved
THAPM bios for VLSI 82C310/312 Version 1.20

Doing a system info using "Checkit" shows that the Rom bios is Phoenix
and the date is 4/19/90
The processor is identified as a 80386AT machine (A20 active),
(Protected)
Note: The diagnostic program I used, (Checkit) is rather old so it
could be mistakenly identifying this machine as a 386 when it is in
fact a 486 but that is not my concern. The machine has a VGA accessory
jack in the back so that I'm assuming you can connnect a VGA monitor to
it. I never tried to do this until today and found that it will not
work. You do see some raster changes taking place on the monitor during
bootup but you never get a display. I was thinking that perhaps I might
have to go into bios and tell the machine that it is outputing to an
external display rather than the LCD one? If so that calls for two
questions. Should I be able to get a simultaneous display on the laptop
as well as the external monitor? And then if not how do I get into
bios? (I would like to know this anyway). I have tried Delete, Alt,
Cont Z , C, F1 every combination that I could think of and nothing
works. You see, I need to connect up a video projector that came in for
repair to this laptop and need to determine that it will produce a
normal display on a VGA monitor first. Any assistance with this problem
will be greatly appreciated.
Lenny Stein, Barlen Electronics

i can give you some idea's

on the Start up try at memory scan.
DEL Key, common to many but not to common in Phenix type bios.
F1
<ctrl>+Shift
<ctrl>+S

etc/.

 

[James Sweet]

<captainvideo462002@yahoo.com> wrote in message
news:1113405216.219242.256350@f14g2000cwb.googlegroups.com...

I have a Twinhead laptop with the following markings: Slimnote 486SLC.
The bios information that comes up on boot is as follows:

CL-G6410VGA Bios Version 2.10C
Copyright 1992 Cirrus Logic Inc, All Rights Reserved
Copyright 1987-1990 Quadtel Corp, All rights reserved

Phoenix Bios (TM) A386 Version 1.01
Copyright (C) 1985-1991 Phoenix Technologies LTD
All rights reserved

Phoenix Bios for VLSI 82C310/82C312
80486LC Bios version 1.1, 11/22/93 All rights reserved
THAPM bios for VLSI 82C310/312 Version 1.20

Doing a system info using "Checkit" shows that the Rom bios is Phoenix
and the date is 4/19/90
The processor is identified as a 80386AT machine (A20 active),
(Protected)
Note: The diagnostic program I used, (Checkit) is rather old so it
could be mistakenly identifying this machine as a 386 when it is in
fact a 486 but that is not my concern. The machine has a VGA accessory
jack in the back so that I'm assuming you can connnect a VGA monitor to
it. I never tried to do this until today and found that it will not
work. You do see some raster changes taking place on the monitor during
bootup but you never get a display. I was thinking that perhaps I might
have to go into bios and tell the machine that it is outputing to an
external display rather than the LCD one? If so that calls for two
questions. Should I be able to get a simultaneous display on the laptop
as well as the external monitor? And then if not how do I get into
bios? (I would like to know this anyway). I have tried Delete, Alt,
Cont Z , C, F1 every combination that I could think of and nothing
works. You see, I need to connect up a video projector that came in for
repair to this laptop and need to determine that it will produce a
normal display on a VGA monitor first. Any assistance with this problem
will be greatly appreciated.
Lenny Stein, Barlen Electronics

IIRC 486 SLC uses a 386 chipset so it'll detect as a 386.

Some of these laptops had a special driver to select the VGA output from
within the OS, you might have to find that.

 

[James Sweet]

Lenny...... your machine is in fact a 386. The SLC chip was made by
Cyrix, a little thing about three quarters of an inch square and it went
like stink (for its time). They usually had an oversize heat sink as
they ran very hot.
Most early Phoenix Bios were accessable ONLY with a bios change program.
There are (read... used to be) lots of freeware stuff out there for this.
BTW, the bios program for the 286/386 Compaq's will usually work on this.
As for the VGA port, I think you will find it is an EGA. Same socket,
different pinning.
I think that TI actually made these machines for Twinhead.
This link may help on the BIOS

The SLC chip actually ran quite cool and didn't require a heatsink, I had
one in my desktop machine many years ago, it was indeed as fast as the real
486 my friend had at the time.

The later Cyrix Pentium class chips did indeed run very hot, and were not as
fast as claimed for most tasks either.

 

[Mark D. Zacharias]

jack@nospam.com wrote:

On Sat, 9 Apr 2005 05:17:09 -0500, "Mark D. Zacharias"
spammenot@yis.us> wrote:

Butting in....

So what are you guys' favorite meters?

I mentioned my Beckman 223 died. I always liked the Fluke 77, and
don't need special stuff like frequency counter, computer
connectivity or the like.


I had a beckman at one place I worked and I remember it was great for
battery life. Some other meters I was always replacing the 9v
battery.

Good point. How is the battery life on the Fluke meters?

Mark Z.

 

[JazzMan]

Mark D. Zacharias wrote:

jack@nospam.com wrote:
On Sat, 9 Apr 2005 05:17:09 -0500, "Mark D. Zacharias"
spammenot@yis.us> wrote:

Butting in....

So what are you guys' favorite meters?

I mentioned my Beckman 223 died. I always liked the Fluke 77, and
don't need special stuff like frequency counter, computer
connectivity or the like.


I had a beckman at one place I worked and I remember it was great for
battery life. Some other meters I was always replacing the 9v
battery.

Good point. How is the battery life on the Fluke meters?

I replace mine every six months whether it needs it or
not. I've got two '87s and an '88.

JazzMan
--
**********************************************************
Please reply to jsavage"at"airmail.net.
Curse those darned bulk e-mailers!
**********************************************************
"Rats and roaches live by competition under the laws of
supply and demand. It is the privilege of human beings to
live under the laws of justice and mercy." - Wendell Berry
**********************************************************

 

[Lee Babcock]

James Sweet wrote:

Lenny...... your machine is in fact a 386. The SLC chip was made by
Cyrix, a little thing about three quarters of an inch square and it went
like stink (for its time). They usually had an oversize heat sink as
they ran very hot.
Most early Phoenix Bios were accessable ONLY with a bios change program.
There are (read... used to be) lots of freeware stuff out there for this.
BTW, the bios program for the 286/386 Compaq's will usually work on this.
As for the VGA port, I think you will find it is an EGA. Same socket,
different pinning.
I think that TI actually made these machines for Twinhead.
This link may help on the BIOS




The SLC chip actually ran quite cool and didn't require a heatsink, I had
one in my desktop machine many years ago, it was indeed as fast as the real
486 my friend had at the time.

The later Cyrix Pentium class chips did indeed run very hot, and were not as
fast as claimed for most tasks either.


The SLC's came from 16 - 40 Mhz and the higher speed ones were very hot

indeed! They actually produced a tiny little cooling fan on a heat sink
for them, but getting replacements for them was almost impossible
Regards
Lee in Toronto

 

[hemyd]

G'day Juan,

Go to this link

http://www-1.ibm.com/support/docview.wss?uid=psg1MIGR-4PER6S

and download the hardware maintenance manual.

What I normally do is check externally for any obvious obstructions to air
flow at the air intake and vents.

If you've never taken apart a laptop then I suggest being very careful with
dismantling the Thinkpad, as the A21 is relatively complex to dismantle. If
you do decide to dismantle it, follow the intructions meticulously. Keep
record of which screws go where. Take anti-static precautions and try to
avoid touching circuitry.

Once the covers are off, it is relatively easy to remove the heatsink/fan
assembly. I'd clean the fan blades by at least blowing them out, and I'd
make sure that there is a good contact between the heatsink and the
processor - use some thermal paste.

You can approach IBM re purchasing a new fan/heatsink assembly, but
unfortunately you may find that the system board needs replacing, and that
is very pricey. You also run the risk of putting the Thinkpad out of action
completely, so be careful.

Henry.

"Juan Villagra" <El.Robot.de.Mimbre@gmail.com> wrote in message
news:8bbdbcf7.0504131259.61e78cc2@posting.google.com...

Hello everybody.
I need some help with an IBM ThinkPad A21m, 2628-D1S type.
It have some problem with the CPU fan.After a long period to be off,
it boots ok, and can work for a little while, but suddenly it falls
off. After that, it enters in a quick boot-fail cycle. If i leave it
off for a while, it can boot again, but go quickly do dead again.The
cause is CPU overheating, because the CPU fan dont work. But, the fan
is OK (i tested it ith direct poer supply (5V)), and occasionally it
starts ok with the notebook boot up, but it stops and don´t restarts.
It looks like some power management or thermal sensor failure, or
maybe the BIOS... i don't know. Has anybody seen this kind of problem
before? Can anybody put some light on this?

Thanks from now.



Juan Villagra.
ERdM

 

[Franc Zabkar]

On Wed, 13 Apr 2005 18:04:28 -0400, Lee Babcock
<leebabcock@rogers.com> put finger to keyboard and composed:

As for the VGA port, I think you will find it is an EGA. Same socket,
different pinning.

If it's 15 pin it's VGA.

In any case the Cirrus Logic VGA BIOS identifies itself as
"CL-G6410VGA Bios Version 2.10C".


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

"Ron(UK)" <ron@lunevalleyaudio.com> wrote:

With my distributor, I can make my own choice. When they stock fakes, it
is clearly indicated in the part-number. A fake or off-brand 30 cent
BU2520AX is good enough to substitute for a 1 euro original BU2508AX...
I would never try to use it in place of a real BU2520, though.
I think he means fake as in that they are not the device indicated on
the package. often a cheap bipolar transistor of a few pennies,
illegally masquarading as a very expensive chopper transistor and not
suitable in the slightest for the intended purpose. It,s becoming more
and more of a problem with TV PSU transistors and dedicated i.c`s.

Well, I have a batch of those BU2520AX's that look like Philips to a
casual observer, but are not. They may or may not be manufactured as
BU2520AX, so to be on the safe side I am not using them to full specs,
which is okay by me since they are cheap enough. I'd rather have their
manufacturer mark the with a brand name instead of making them look like
another brand if it's the real stuff.

---
Met vriendelijke groet,

Maarten Bakker.

 

maarten@panic.xx.tudelft.nl wrote:

Well, I have a batch of those BU2520AX's that look like Philips to a
casual observer, but are not. They may or may not be manufactured as
BU2520AX, so to be on the safe side I am not using them to full specs,
which is okay by me since they are cheap enough. I'd rather have their
manufacturer mark the with a brand name instead of making them look like

That should read "mark them with THEIR brand name", meaning I'd rather
buy some obscure brand that supports its products instead of making them
only look good.

---
Met vriendelijke groet,

Maarten Bakker.