[TechAssist] Re: RCA D52W20 chassis ITC222 shutdown fix
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 2 Jul 2004 08:30:59 -0500
There is no aluminum
and it takes more heat on the RCA and Panasonic circuits to flow the solder.
Thy are using a alloy like what RCA was sending out for the tuner ground
fix.
below is copied from Panasonic bulletin
Soldering with Lead Free Solder
Legislation against the use of lead in the electronic workplace has been the
driving force behind the use of lead free solders. However, the relatively
high melting
point of lead-free solders poses a major challenge to manufacturers and
service
organizations. The high temperature could cause damage to small components
and to
printed circuit boards. Fine Chip Scale Packages (CSP), Surface Mount
Devices (SMD),
and Ball Grid Arrays (BGA) components are used on a significant number of
consumer
products including Panasonic's. Replacement of these components without
damage to
them or the neighboring devices requires good soldering skills.
Panasonic subscribes to the definition of lead-free solder found in the
European
WEEE (Waste Electric and Electronic Equipment) Directive. According to the
WEEE
Directive, solder containing less than 0.1% or 100 ppm lead is considered
lead-free.
Tips on Lead Free Soldering
. Lead free solder, commonly known by
the symbol PbF, is made from Tin (Sn),
Silver (Ag), and Copper (Cu). It has a
melting point that is 50°~70°F
(30°~40°C) higher than standard solder.
It is recommended that a temperature
controlled soldering iron be used with its
temperature set to 700°F ± 20°F (370°c
±10°c).
. Lead-free solder (PbF) tends to splash if
heated to a much higher temperature
than that of its melting point. Splashing
may occur at temperatures around
1100°F (600C°) or higher.
. Our basic policy is to use lead-free solder in all repairs on PCBs made
with lead-free
solder. It may be necessary in adverse situations to use leaded (Pb) solder
on a
PCB that was manufactured using lead-free (PbF) solder. Try and remove as
much
of the original lead-free (PbF) solder as possible and assure that any
remaining
solder is melted prior to applying the lead (Pb) solder.
. When applying lead-free (PbF) solder to double layer boards, please check
for an
excess flow of solder which may find its way to the other side.
Available Resources
Lead free solder, approved by Panasonic, can be purchased from Panasonic's
National Parts Center (NPC) in Kent, WA, telephone (800) 833-9626.
Panasonic approved lead-free (PbF) solder part numbers are:
Part Number Thickness Weight
RMA98M705P33 0.3mm 250g roll
RMA98M705P36 0.6mm 500g roll
RMA98M705P31 1.0mm 1kg roll
Tritronics also sells Kester lead free solder
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Jeff Farnsworth" <jlfonz@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 02, 2004 7:15 AM
Subject: [TechAssist] Re: RCA D52W20 chassis ITC222 shutdown fix
> You bring up an interesting point. I've noticed the difference of the
> solder on the new sony direct views. It allmost looks like the solder
> contains aluminum. It also seems to flow at a lower temperature which if
it
> is the same on these rca's would make it easier to wave solder with a hot
> air gun or other. I have never used this technique yet and am interested
in
> the temperature needed to successfully reflow these boards with hot air?
> This may have fixed a a sony I just ordered an "A" board for because of
> intermittant either on/in or near the main micro.
>
> TV Doctor
> Avalon, Wi
>
> ----- Original Message -----
> From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 02, 2004 6:49 AM
> Subject: [TechAssist] Re: RCA D52W20 chassis ITC222 shutdown fix
>
>
> > We were told, all the connectors on the small signal board.
> > I take my hot air desoldering gun and just heat the solder on all the
pins
> around the outside of the
> > board. The type of solder they use for these is a different alloy than
the
> lead solder most common.
> > Heating with an iron will not allow the solder to stay on the pad.
> > Jeff
> > --
> > Intrepid Video TV/VCR Repair
> > 263 S Front St, Steelton PA 17113
> > 717-939-7708; (F) 717-564-4952
> > www.intrepid-video.com www.tech-repair.net
> > ----- Original Message -----
> > From: "al m" <ampm@xxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, July 01, 2004 9:57 PM
> > Subject: [TechAssist] Re: RCA D52W20 chassis ITC222 shutdown fix
> >
> >
> > I've seen this before. What connector pins are you talking about? And
why
> > not use an iron?
> > Al Marquardt
> > ampm@xxxxxxx
> > Al Marquardt Electronic Repair
> > 206 W Main
> > Girardville Pa. 17935
> > ----- Original Message -----
> > From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, July 01, 2004 9:37 PM
> > Subject: [TechAssist] Re: RCA D52W20 chassis ITC222 shutdown fix
> >
> >
> > > Great,
> > > Thanks Robert...we need tips on these...especially when the deflection
> > board is not warranty
> > > replaceable...
> > > Also, for the three clicks, if the troubleshooting guide for this
leads
> > you to the SSB, a simple reflowing
> > > of the solder on the connector pins may fix it.
> > > Use hot air or a torch...do not use an iron.
> > > Also, for width and pin problems, DL032, TL100 and DL100(I hope their
> > right).
> > >
> > > Jeff
> > > --
> > > Intrepid Video TV/VCR Repair
> > > 263 S Front St, Steelton PA 17113
> > > 717-939-7708; (F) 717-564-4952
> > > www.intrepid-video.com www.tech-repair.net
> > > ----- Original Message -----
> > > From: "tvservice" <tvservice@xxxxxxxxxxxxx>
> > > To: <techassist@xxxxxxxxxxxxx>
> > > Sent: Thursday, July 01, 2004 6:36 PM
> > > Subject: [TechAssist] RCA D52W20 chassis ITC222 shutdown fix
> > >
> > >
> > > This is for info only, also posted to members area
> > > The hv would come up and then shutdown with 3 pulses.
> > >
> > > Monitoring EHT line from flyback at pin 10 of connector BL111 from
> > deflection board to small signal board
> > > measured only +15 volts
> > > before shutdown. This is normally around +26 volts. according to
> Tech-Line
> > > Found resistor RL044 on deflection board off pin 10 same connector had
> > increased in value to 650K ohm
> > > should be 221K ohm
> > > this resistor is located under heatsink for vertical IC
> > >
> > > To temporarily defeat shutdown (FOR TEST ONLY) short transistor TV852
> B-E
> > on small signal board location
> > > H-7
> > >
> > > Robert
> > > tvservice@xxxxxxxxxxxxx
> > > H & H Electronics Inc
> > >
> >
>
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