[TechAssist] Re: Sharp 32U-S50B Dead
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 24 Apr 2004 22:37:38 +0000
A comarison of votatages says this set is quite squerily, B+ at collector of
HOT is 126.4V in standby, When power is pushed it rises to ~133v. The output
from the error amp is around 11v in standby and drops to 6 to 7 v when power
is pushed. The 13 V supply is 13v in standby but drops to 7.5V when power is
pushed, the 8V supply drops to 5v. On the primary side of the swmode
transformer the voltage on the opto isolator is only 12.4v instead of the 16
V that the schematic says, this too varys when attempting to turn on. If pin
2 of the SE125 is pulled B+ rises to 178V. There is never any apparent
attempt at horizontal ossolation. Listening to the audio harmonics of the
frerun frequency of the swmode power sugests there might be a minor
load/frequency aboration but it is quite faint and component testing thus
far has been negitive.
Peter Oliver
Tucson Radio TV
From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: Sharp 32U-S50B Dead
Date: Thu, 22 Apr 2004 09:53:54 -0400
Peter,
Just finished up a 32US50, don't know the difference between
yours..
but took some voltages with set off for you, maybe this will help..
From (-) C705 set off...
IC701
1 11.4
2 0
3 1.4
4 .1
5 0
6 0
7 0
8 164.
Q701
S 0
G .3
D 165.
IC702
1 9.7 Tuner ground
2 10.8 Tuner ground
3 1.4 (-) at C705
4 17. (-) at C705
Q601 and Q602
Collectors at 125./ Tuner ground.. Keypad buttons at 4.9
Hope this helps...
Bob,
Bobs TV Worcester, ma
woodman1@xxxxxxxx
Main 508-853-1482
Fax 508-853-1480
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, April 21, 2004 11:31 PM
Subject: [TechAssist] Re: Sharp 32U-S50B Dead
> No luck so far still dead, have redone probabbly about a hundred but this
> whole chassis was built with so many of those dumb vespa feed thru's
that
> seem to always be a problem, and there are hundreds of them. I did notice
> something the schematic I have is a 32US50 this set is a 2003 model
32US50B
> the B seems to indicate some part diffrences' does anyone have the B
> schematic for comparison?
>
> Peter Oliver
> Tucson Radio TV
>
>
> From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
> Reply-To: techassist@xxxxxxxxxxxxx
> To: <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Re: Sharp 32U-S50B Dead
> Date: Tue, 20 Apr 2004 16:11:44 -0400
>
> Peter,
> I posted a repair for the newer Sharps.. All kinds of crazy
> symptoms.. Don't even check... Resolder all the "eyelets" ALL OF THEM..
> There all over degaus, yoke,fly, resistors... I even had one that burnt
the
> foil off the fly pins....
> Bob,
>
> Bobs TV Worcester, ma
>
> woodman1@xxxxxxxx
>
> Main 508-853-1482
> Fax 508-853-1480
> ----- Original Message -----
> From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, April 20, 2004 3:41 PM
> Subject: [TechAssist] Sharp 32U-S50B Dead
>
>
> > Sharp
> > 32u-s50b
> > mfd 2003
> > Set is in a dead/shutdown condition. B+ at collector
of
> HOT
> > is only ~120v. When power is pushed set will click then click off
again
> > after ~ 6 sec. Flyback rings ok (~70 rings on sencore). Have the
> schemaic.
> > And the discusion goes on about pittifel equipment only a year old.
> > Any one run into this before?
> >
> > Peter Oliver
> > Tucson Radio TV
> >
> > _________________________________________________________________
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