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Forum index » Electronix » Repair
B&K E-200D signal generator - no signal
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BWL
electronics forum beginner


Joined: 24 Mar 2005
Posts: 7

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Mitsubishi VS-5071 no picture has sound. Reply with quote

Check vertical circuit first. If the filaments are on, then you've got H.V. and
deflection. IC 401 or 4A01 will be the IC, probably a LA7845. Notorious for
loose solder connections on the pins, as well as cooked and possibly leaking
capacitors in the circuit.
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Robert Bullock
electronics forum beginner


Joined: 13 May 2005
Posts: 17

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Report: Analog CGA monitor Reply with quote

Followup. This monitor in this mode will not show pink, like "Pinky" on Pac
boards. Must be color limited.

"Robert Bullock" <rcbullock@_REMOVE_cox.net> wrote in message
news:d_zHd.14126$sF5.8405@okepread06...
Quote:
I bought a Samsung CD1251F/38NA that works with CGA res with only a sync
seperator circuit. On the back is a switch you must put into Mode II. Mode
I is probably digital TTL CGA I guess. I found the sync seprator at:
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BWL
electronics forum beginner


Joined: 24 Mar 2005
Posts: 7

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Hitachi TV Problems ? Reply with quote

The resistors most likely to go bad are the low value ones close to the IC's
(usually 1-10 Ohm 1/2 or 1 watt). Did replacing the IC's giva any improvement
at all? Hitachi's have had problems with the Digital Convergence Unit.
Replacing the IC's won't help with this problem.
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Antoine Desch?nes
electronics forum beginner


Joined: 25 May 2005
Posts: 12

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Samsung 753DF continued Reply with quote

Jason D. a écrit :
Quote:
On 22 Jan 2005 17:21:46 -0800, antdes45@netscape.net (DragonMaster)
wrote:

....


Quote:

I now think it's the DP104C IC "power switch".
(The current might get too low, turn the switch off, recharge, turn on
. . .)


I have worked on all their Samsung models made since 1998 and this is
not where you're looking for. The design of this SMPS IC is so good
it will protect itself no matter how hard shorts is on outputs.

SMPS is starting fine because it did start up and shuts down which you
heard the relay click. Did LED light up then goes out?

No, the LED never light, except a fraction of second the first time
after being unplugged for two weeks.
Quote:

Put that part back in and what you have to is throubleshoot the
horizontal section. Very often failure point. Usually the flyback
(this one that generates HV and has focus pots), horizontal
transistor, even CRT itself. Also a B+ regulator (using a FET for
chopping up DC through a inductor to the power input on flyback
transformer then out to the HOT's collector.
Can I remove the flyback and see if the LED lights? Or it's like

fluorescent transformers, that will die of there's no load?

Also, when the H transistor is removed, the traces where its pins 1 and
3 go seem shorted, the diode checker beeps.
Quote:

If you can't find problem, it is scrap parts. A new Samsung monitor
is roughly 150-200 for 17" flat CRT new with warrante.
Yeah, I know, these things have 3 year warranty . . . Strangely(Not at

all) the warranty just expired.
Quote:

Samsung WILL NOT sell parts whom is not samsung's service authorized.

Only way is identify the part via their schematic and order parts
through your friendly samsung's service authorized shop. Oh yes, the
part delivery is VERY rapid and cost of parts is medium expensive.

Cheers,

Wizard
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NSM
electronics forum Guru


Joined: 05 May 2005
Posts: 719

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: how do people get away with this? Reply with quote

"James Sweet" <jamessweet@hotmail.com> wrote in message
news:4%YLd.2203$uc.464@trnddc09...

Quote:
There's a lot more that goes into a high(er) end speaker than just the
drivers. Usually the cabinets are more solidly constructed to more
accurate
dimensions, and everything including the drivers is of higher quality with
closer tolerances. I say higher, because to some "high end" means
ridiculously overpriced audiophool crap.

One of the most critical elements is sealing all the joints against air
pressure. Also, if you read some of the British books on speaker
construction, they used to build their boxes out of sand filled panels, or
panels with ceramic tiles bonded inside, or even of brick or cement!
--
N
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NSM
electronics forum Guru


Joined: 05 May 2005
Posts: 719

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: how do people get away with this? Reply with quote

"True american Zero" <True_American_Zero@mickeythecat.org> wrote in message
news:030220050058343394%True_American_Zero@mickeythecat.org...
Quote:
Sorry guys, I've got no benefit in this story but it really works.

First of all, the CD has to be demagnetized.

The DVD rewinder will do this for you. It does CDs as well as DVDs.

http://dvdrewinder.com/index.php?main_page=product_info&products_id=1

--
N
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Jamie
electronics forum Guru


Joined: 24 Mar 2005
Posts: 597

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: how do people get away with this? Reply with quote

True american Zero wrote:

Quote:
Sorry guys, I've got no benefit in this story but it really works.

First of all, the CD has to be demagnetized. There's been an article
bout this in one of the "Elektor" books and I tought at first it was an
april fool's day. Then after, it appeared its true, somer magnetization
may influence the path of the laser beam.

That's for the CD topic.

Now, if you us this guy's machine, you must be absolutely sure that
you've got no DC in the signal path, otherways, it will never work or
even get worse.

Cheers
Georges
HA, LOL!!
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Jamie
electronics forum Guru


Joined: 24 Mar 2005
Posts: 597

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: how do people get away with this? Reply with quote

Ken Weitzel wrote:

Quote:


True american Zero wrote:

Sorry guys, I've got no benefit in this story but it really works.

First of all, the CD has to be demagnetized. There's been an article
bout this in one of the "Elektor" books and I tought at first it was an
april fool's day. Then after, it appeared its true, somer magnetization
may influence the path of the laser beam.

That's for the CD topic.

Now, if you us this guy's machine, you must be absolutely sure that
you've got no DC in the signal path, otherways, it will never work or
even get worse.

Cheers
Georges


Hi...

Don't miss my version, which will be up for sale on
ebay soon. Just have to complete the final test.

Mine will cost a little more, but will do far, far more.

Not only will it demagnetize CD drives, but it will ALSO
demagnetize all of your hard drives. AND it comes with
a free AC battery, which you may use in series with your
data line to elimated that dratted DC.

Don't miss out; supplies are limited.

Ken

I can't wait!, i'll camp infront of your store for the open

sale day!
Smile
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Ken Weitzel
electronics forum Guru


Joined: 29 Apr 2005
Posts: 314

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: how do people get away with this? Reply with quote

NSM wrote:

Quote:
"True american Zero" <True_American_Zero@mickeythecat.org> wrote in message
news:030220050058343394%True_American_Zero@mickeythecat.org...

Sorry guys, I've got no benefit in this story but it really works.

First of all, the CD has to be demagnetized.


The DVD rewinder will do this for you. It does CDs as well as DVDs.

http://dvdrewinder.com/index.php?main_page=product_info&products_id=1


True. Any idea where I can get a good deal on a printer
rewinder? The one I've got works, but it takes a loooong
time.

Ken
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chaseme5
electronics forum beginner


Joined: 24 Mar 2005
Posts: 9

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Mitsubishi VS-50703 does not turn on Reply with quote

I was looking as the main board if the mitsubishi VS 50703 and noticed that
I saw clear fluid on the board. An aluminium heat sink is corroiding due
to the fluid. Is this what happens when a eletrolitic cap fails, they leak
fulid? Can this damage other parts.
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Aldo Larrabiata
electronics forum beginner


Joined: 24 Mar 2005
Posts: 1

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Contactor on 3 phase motor query Reply with quote

- 220/380 doesn't exist anylonger. 230/400 instead.

- My experience is the opposite of your statement.


"NSM" <nowrite@to.me> a écrit dans le message news:
fafMd.98522$Ob.5382@edtnps84...
Quote:

"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:XC9Md.21790$8g4.14967@fe06.lga...

What would the voltage usually be on the coil of the contactor for
a lathe using a 3 phase motor?. In UK so single phase is 240V ac

most likely 240V, i am from the US and we use 120 normally for the
coil which also matches our resident common voltage. we do also
use 220..240 coils in Foreighn machines that we have.
in the case of your lathe, normally we use manual contactors,
this means no coil is neeeded. i mite what to consider that .

If you use 220/380 your coil would be 380. No-one runs a neutral to a
starter just to run the coil.
--
N
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NSM
electronics forum Guru


Joined: 05 May 2005
Posts: 719

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: how do people get away with this? Reply with quote

"Ken Weitzel" <kweitzel@shaw.ca> wrote in message
news:RBuMd.262632$6l.119750@pd7tw2no...

Quote:
True. Any idea where I can get a good deal on a printer
rewinder? The one I've got works, but it takes a loooong
time.

No, but someone is working on a printer paper cleaner - removes laser ink
from paper for re-use - no joke!
--
N
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NSM
electronics forum Guru


Joined: 05 May 2005
Posts: 719

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: to many colors on my color t.v. Reply with quote

"averagebrian" <averagebrian.1jphln@news.diybanter.com> wrote in message
news:averagebrian.1jphln@news.diybanter.com...
Quote:

this may be easy if you know how but since i dont know how im
askin...HELP. my daughter was playing with a stack of magnets and found
that they made a real neet rainbow on the 13 inch t.v. I've heard this
is an easy fix...ok what is it.......thanks guys.

Do nothing. The TV will correct itself - may take a few days, but it's best
left alone. It won't get worse if it's left alone (unless your daughter
plays with magnets again)!
--
N
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NSM
electronics forum Guru


Joined: 05 May 2005
Posts: 719

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: soldering enamelled wire Reply with quote

"meirman" <meirman@invalid.com> wrote in message
news:afisv0lj3cuib3euptcc2dru3b8j713ehf@4ax.com...
Quote:
Is it necessary to clean the enamel from enamelled wire before
soldering it?

I have a vague recollection that I read that it wasn't, and I only
have a couple little stubs that I'm afraid will beak off if I move
them around at all. (These are part of the 110volt winding in step
down transformer.)

There are two types of enamel in use. One is self fluxing - needs no
removal. Try soldering - if it doesn't work scrape the enamel off with an
exacto knife.
--
N
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NSM
electronics forum Guru


Joined: 05 May 2005
Posts: 719

PostPosted: Thu Mar 24, 2005 3:15 pm    Post subject: Re: Contactor on 3 phase motor query Reply with quote

"Aldo Larrabiata" <duschmoll@racer.com> wrote in message
news:420292f8$0$25768$8fcfb975@news.wanadoo.fr...
Quote:
- 220/380 doesn't exist anylonger. 230/400 instead.

- My experience is the opposite of your statement.

In the USA?
--
N
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Google

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