[TechAssist] Re: "FIXED" RCA Model P61310 Chassis DTV307GC [ 2002 model ] Dead set - NO green light
- From: "J Silverman" <greentron@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 10 Dec 2002 20:16:31 -0500
Besides overvoltage, too much current can cause a cap to overheat. One of
the purposes of the cap is to "absorb" high frequency ripple current. The
cap has some ESR. Thus heat is generated. Beyond a certain temperature, the
ESR increases and the heating can go into a runaway condition and pop the
capacitor. So my first guess is that those caps had too high an ESR for the
application.
Years ago we had a contract to maintain a large number of data terminals at
a warehouse and sales center. Every monday morning we had to go out with a
bunch of computer power supplies to replace those that blew their filter
caps when the power was turned back on after the weekend. The electrolytics
would deteriorate a little when the power was off and get pretty hot for a
short time untill they repaired themselves or blew, whichever happened
first. We were only supposed to change out the supplies, not repair them.
Just send them back for refurbishing. Tried to tell them what was causing
the problem, but they didnt accept upward communication from the field.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, December 10, 2002 4:48 PM
Subject: [TechAssist] Re: "FIXED" RCA Model P61310 Chassis DTV307GC [ 2002
model ] Dead set - NO green light
>
> That's ok.
>
> My question is what blows the top out of a 9400uf 10v cap (that is two
4700s
> in parallel) on a 5v line without blowing other parts. Maybe the DM1 has
> some good over-voltage protection inside?
>
> Wayne Vanaman
> Omega Electronics
> 6904 W Fairfield Dr
> Pensacola, FL 32506-3310
>
> 850-456-5995 voice
> 850-458-6369 fax
>
> Wayne@xxxxxxxxxxxxxxxxxxxxx
> www.PensacolaTVRepair.Com
>
> ----- Original Message -----
> From: "Kevin" <kevinstv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 10, 2002 2:46 PM
> Subject: [TechAssist] Re: "FIXED" RCA Model P61310 Chassis DTV307GC [ 2002
> model ] Dead set - NO green light
>
>
> >
> > My question is, why would a new set have leaking caps already? Good old
> > RCA technology at work?
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevinstv@xxxxxxx
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of LeRoy Westlund
> > Sent: Tuesday, December 10, 2002 12:30 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] "FIXED" RCA Model P61310 Chassis DTV307GC [ 2002
> > model ] Dead set - NO green light
> >
> >
> > Robert, and All;
> > This turned out to be an EASY repair (In the home).(Less the 1 hour) !
> > You were right about the 2 Caps. They were BOTH leaking from the top.
> > Easy to spot them.
> > I used Mallory # VTH4700M16, cause that's what I took with me.
> > This set had been acting up for some time. Some days it would work for a
> > while, until finally, it wouldn't turn on anymore.
> >
> > Thanks to everybody who responded to my post.
> > Including Wayne Venaman, Jerry Eiting, Larry Eastman, Jeff Dougherty,
> > and
> > anyone I may have missed.
> > ****See Roberts thread below, for part numbers, etc.
> >
> > LLW
> >
> > LeRoy Westlund
> > Westlund TV & Electronics " It's such a pretty world
> > 93 North Main today !....
> > Centerfield, UT 84622-0087 Look at the Sunshine. "
> > Ph./Fax 435-528-3822 :-)
> > mailto:LLW@xxxxxxxxxx
> >
> > -----Original Message-----
> > From: tvservice <tvservice@xxxxxxxxxxxxxxxxxxx>
> > To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> > Date: Tuesday, December 10, 2002 9:48 AM
> > Subject: [TechAssist] Re: RCA Model P61310 Chassis DTV307GC [ 2002 model
> > ]
> > Dead set - NO green light
> >
> >
> > >
> > >DTV0306/307 check caps C14113, C14115 in +5volt power supply to DM1
> > module
> > >if brown color replace with #248988 4700mfd 10volt
> > >will cause several strange symptoms including dead.
> > >
> > >Robert
> > >tvservice@xxxxxxxxxxxxxxxxxxx
> > >H & H Electronics Inc
> > >
> > >----- Original Message -----
> > >From: "LeRoy Westlund" <llw@xxxxxxxxxx>
> > >To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> > >Sent: Monday, December 09, 2002 2:35 PM
> > >Subject: [TechAssist] RCA Model P61310 Chassis DTV307GC [ 2002 model ]
> > Dead
> > >set - NO green light
> > >
> > >
> > >>
> > >> Hi Techs,
> > >> I need to make a long S/C on this PTV.
> > >> This will be my first incounter for the DTV307 chassis.
> > >> I know they are hard to work on,....but, I want to give it a try.
> > >> This set is Dead, with NO green light.
> > >> Does anybody have any fixes in their data bases for a Dead set (No
> > start),
> > >> (NO green light), condition for this chassis ?
> > >>
> > >> Any help is appreciated.
> > >> LLW
> > >>
> > >> LeRoy Westlund
> > >> Westlund TV & Electronics " It's such a pretty world
> > >> 93 North Main today !....
> > >> Centerfield, UT 84622-0087 Look at the Sunshine. "
> > >> Ph./Fax 435-528-3822 :-)
> > >> mailto:LLW@xxxxxxxxxx
> > >>
> > >>
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