[TechAssist] Re: TA Samsung TC2540S..R415 open..FBT replaced 1 month ago
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Dec 2003 06:57:21 -0600
Jeff, if there is an input/output resistor around the fuse you can scope
across it to derive the current from ohms law. The scope should be able to
show the peak current draw.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
----- Original Message -----
From: <support@xxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, December 30, 2003 11:24 PM
Subject: [TechAssist] Re: TA Samsung TC2540S..R415 open..FBT replaced 1
month ago
> I know Phil...the 1.2 amp fast blow is what's blowing...
> I will order the time delay and try that...I hope that fixes it..
> Thanks..
>
> Jeff Dougherty
> Intrepid Video TV/VCR
> 263 S Front St
> Steelton PA 17113
> fax...717-564-4952
> www.intrepid-video.com www.tech-repair.net
>
> ----- Original Message -----
> From: "Phillip R. Hull" <phil245@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 30, 2003 3:12 PM
> Subject: [TechAssist] Re: TA Samsung TC2540S..R415 open..FBT replaced 1
month ago
>
>
> According to the SM the 3amp fuse is a Time lag fuse and the 1.2A is a
> regular fuse.
> Phillip R Hull STET
> phil245@xxxxxxxxxxxxx
> FAX 517--569-3075
> Professional Technicians only
> ----- Original Message -----
> From: <support@xxxxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 30, 2003 2:04 PM
> Subject: [TechAssist] Re: TA Samsung TC2540S..R415 open..FBT replaced 1
> month ago
>
>
> > Negative...
> > I thought of that, but this set says 1.2 amp, fast/blow right on the
PCB.
> > Plus, if that was the problem, wouldn't it blow right away? Now this set
> will work for a few minutes
> > before the fuse goes.
> > Thanks anyways, guys.
> >
> > Jeff Dougherty
> > Intrepid Video TV/VCR
> > 263 S Front St
> > Steelton PA 17113
> > fax...717-564-4952
> > www.intrepid-video.com www.tech-repair.net
> >
> > ----- Original Message -----
> > From: "Doug Keller" <dek@xxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Tuesday, December 30, 2003 12:29 PM
> > Subject: [TechAssist] Re: TA Samsung TC2540S..R415 open..FBT replaced 1
> month ago
> >
> >
> > I agree. I had one awhile back that was doing the same thing. They are a
> > "slo-blo" or time delay or something, but not a regular fuse. There is
> > probably no problem with the set.
> >
> > Doug Keller
> > Wis-Kel Electronics
> > 101 Freeland Ave.
> > Terra Alta, WV
> > USA 26764
> > dek@xxxxxxxxxxxxxx
> > http://www.tech-assist.org
> > "Learn from the mistakes of others, because you
> > won't live long enough to make them all yourself"
> >
> >
> >
> > Phillip R. Hull wrote:
> >
> > >Most all of those Samsungs use a Time delay fuse
> > >Phillip R Hull STET
> > >phil245@xxxxxxxxxxxxx
> > >FAX 517--569-3075
> > >Professional Technicians only
> > >----- Original Message -----
> > >From: <support@xxxxxxxxxxxxxxxxxx>
> > >To: <techassist@xxxxxxxxxxxxx>
> > >Sent: Tuesday, December 30, 2003 12:13 PM
> > >Subject: [TechAssist] TA Samsung TC2540S..R415 open..FBT replaced 1
month
> > >ago
> > >
> > >
> > >
> > >
> > >>This set is back again.,..
> > >>This time the 1.2 amp fuse is open. Customer said it failed when she
> > >>
> > >>
> > >pressed the power button. I found an
> > >
> > >
> > >>intermittent trace from R415. Now set will stay on for a few minutes,
> then
> > >>
> > >>
> > >the fuse opens.
> > >
> > >
> > >>I suspect the FBT which I got from ASTI, but I would think the HOT
would
> > >>
> > >>
> > >go also.
> > >
> > >
> > >>I have no schematic, but I checked every thing I could find in the HV
> > >>
> > >>
> > >section..resistors, diodes, etc.,
> > >
> > >
> > >>but can find no problems. I have tried to troubleshoot this thing, but
I
> > >>
> > >>
> > >keep going through fuses to
> > >
> > >
> > >>quick.
> > >>Should I order another FBT?
> > >>Thank you.
> > >>
> > >>
> > >>
> > >>Jeff Dougherty
> > >>Intrepid Video TV/VCR
> > >>263 S Front St
> > >>Steelton PA 17113
> > >>fax...717-564-4952
> > >>www.intrepid-video.com www.tech-repair.net
> > >>
> > >>----- Original Message -----
> > >>From: <support@xxxxxxxxxxxxxxxxxx>
> > >>
> > >>I repaired this set exactly one month ago.
> > >>Replaced the FBT with a generic from Acme Sales...(Don't say it).
Also,
> > >>
> > >>
> > >replaced the fuse, HOT and R415.
> > >
> > >
> > >>Got a call today the set was dead again, just clicked on, then clicked
> off
> > >>
> > >>
> > >when pressing power.
> > >
> > >
> > >>Went over this evening to find R415 (.47/1w) open again and burnt. I
> > >>
> > >>
> > >replaced it with a .39 ohm and the
> > >
> > >
> > >>set worked. The color bands were burnt on this.
> > >>The B+ goes through this resistor.
> > >>I felt the resistor after running the set for a while and it didn't
get
> > >>
> > >>
> > >real hot.
> > >
> > >
> > >>Question, could a faulty flyback cause this or a marginal reg?
> > >>Is it possible the lower value I used may increase the longevity of
this
> > >>
> > >>
> > >component?
> > >
> > >
> > >>Thank you.
> > >>
> > >>
> > >>
> > >>
> >
>
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