[TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 4 Jul 2003 16:46:23 -0400
A 6 amp supply may not be enough for startup either. I have a 7 amp supply
with adjustable current trip and it wont start those 12 volt combos.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 04, 2003 2:18 PM
Subject: [TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
> Yes I agree with using a battery. I now am using a 12 volt power supply 6
> amp . Now the TV has B+ but now Horiz drive. I am trying to trace the
> circuit back to the source of the drive pulse. The print I am using is not
> correct. I am going over more solder connections also.
> thanks for the help,
> Bruce.
> ----- Original Message -----
> From: "al m" <ampm@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 04, 2003 1:11 PM
> Subject: [TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
>
>
> > When I worked in a warranty shop I did the same thing. Then we got a
> battery
> > and hooked it up and the TV turned right on. Kept that battery on the
> bench
> > for those 12V TV's.
> > al marquardt
> > ampm@xxxxxxx
> > Al Marquardt Electronic Repair
> > 206 W Main
> > Girardville Pa. 17935
> > ----- Original Message -----
> > From: "C&W Electronics" <c_w_electronics@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, July 04, 2003 12:38 PM
> > Subject: [TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
> >
> >
> > > Bruce,
> > > One other thing that I did not notice on the first read of your post,
> was
> > that the unit was 12 dc only. Make sure that your power supply is
capable
> of
> > supplying enough current to keep the tv power supply working long enough
> to
> > make the start-up transition.
> > > I worked my butt off one time on the same type of start-up problem.
> Found
> > that my (old)power supply was dropping voltage at high current draw(bad
> > 20,000uf filter). I went out and plugged it into my van and it kicked
> right
> > off. I had it 'fixed' and didn't know it. I then repaired my power
supply.
> I
> > don't know why things won't last more than 40 years! Tsk tsk.
> > >
> > > Paul W
> > > C&W Electronics
> > > Azle Texas
> > > ----- Original Message -----
> > > From: Bruce Tiedeman
> > > To: techassist@xxxxxxxxxxxxx
> > > Sent: Friday, July 04, 2003 9:59 AM
> > > Subject: [TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
> > >
> > >
> > >
> > > Thanks Paul,
> > > I will go over the connections again . I suspect this kind of a
> problem
> > also
> > > with no luck so far. It is like finding a needle in a hay stack.
> > > Bruce.
> > >
> > > ----- Original Message -----
> > > From: "C&W Electronics" <c_w_electronics@xxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Friday, July 04, 2003 10:45 AM
> > > Subject: [TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
> > >
> > >
> > > > Bruce,
> > > > I haven't worked on this particular model, but I have repaired
> 'many'
> > > combos for Long Haul Truckers. 99% of the time it will be 'defective
> > solder
> > > connections', which is caused by 'vibration'. Either use a strong
> > magnifying
> > > lens to check and resolder any dodgey connections.
> > > > I have found that some parts will actually break loose from the
ckt
> > board.
> > > >
> > > > Paul W
> > > > C&W Electronics
> > > > Azle Texas
> > > >
> > > > ----- Original Message -----
> > > > From: Bruce Tiedeman
> > > > To: techassist@xxxxxxxxxxxxx
> > > > Sent: Friday, July 04, 2003 8:33 AM
> > > > Subject: [TechAssist] 9" Memorex TVM0903 12 VOLT TV. No Start!
> > > >
> > > >
> > > > Memorex TVM0903 NO START!
> > > >
> > > > 5 volt regulator is OK. I changed the 9 volt regulator and
checked
> > most
> > > > caps. This set is only 2 years old used in motor home (12 volt
> only
> > plug
> > > > in). Can see the horiz pulse start to develop then shuts down.
> > Thought I
> > > > would try the list before giving up on this set. Not worth
buying
> a
> > > print
> > > > for this set.
> > > >
> > > > thanks for any help,
> > > > Bruce
> > > >
> > > > B&T Electronics
> > > > 139 Margaret St
> > > > Sarnia Ontario
> > > > Canada
> > > > N7T 2Y3
> > > > 519 344 1850
> > > >
> > > >
> > > >
> > >
> >
>
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