[TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
- From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 5 Jul 2003 17:34:10 -0400
Yes Jerry you might be right but this unit is a TV only. I might have
mislead some on this. The unit is a 12 volt TV wired in parallel to a 12
volt VCR they are separate units in a consol affair must go in a Van. I did
not inquire about the vehicle. I removed the TV and am working on it alone.
I do have B+ now? but tracing the drive signal back to the Jungle chip there
is no pulse. There is no Horiz drive from the jungle chip... The I. C., I
followed the trace to is LA7681 ,but I have no pin out diagram for this
chip.I have soldered most of the board with no luck. Memorex does not have
any information on there own set on the Web site.
thanks
Bruce.
----- Original Message -----
From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 04, 2003 4:46 PM
Subject: [TechAssist] Re: 9" Memorex TVM0903 12 VOLT TV. No Start!
> 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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