[TechAssist] Re: Toshiba 27A51 dead
- From: walter wood <wwood_38478@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 7 Aug 2003 11:45:21 -0700 (PDT)
The schematic shows 0 voltage on pins 2 and 3.
That only leaves pin5 suspect, and that 4 volts may
not appear unless the set is running.
I'll probably just order the regulator and opto
anyway, as I have to order the diode. I knew
toshiba didn't build it, but didn't know who did.
It's got a JVC flyback, a philips crt, an orion
jungle and a toshiba micro.
Thanks
Walter
--- Corey Brazell <cohbraz@xxxxxxxxxxxxxx> wrote:
> All of Toshiba's 27" and under TVs, starting in
> 2001, are built by Orion.
> D514 is a common failure, as well as the
> Opto-Isolator, but the voltages on
> your switching regulator do not sound right. If
> you have 167vdc in, a small
> voltage on one of the other pins, and no voltage
> on the other three pins,
> then it is not putting out any regulated or
> switched voltage.
> I would start with the regulator.
> Good luck!
> Corey Brazell
> Audio Video Electronics
> 12169 SC Hwy 121
> Newberry SC 29108
> (803) 276-9966
> ----- Original Message -----
> From: "walter wood" <wwood_38478@xxxxxxxxx>
> To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, August 07, 2003 11:48 AM
> Subject: [TechAssist] Toshiba 27A51 dead
>
>
> >
> >
> > > Haven't found any flow charts or theory on
> this
> > > one.
> > > Likely Toshiba didn't build it anyway.
> > >
> > > DEAD, nothin' at all when power is pushed.
> > > Lightning likely, but nothing burned and fuse
> > > good.
> > On primary side
> > > IC501
> > > pin 1 167vdc
> > > 2 0
> > > 3 0
> > > 4 12 to 14vdc
> > > 5 0
> > On secondary side
> > > D 514 2.1 to 2.5vdc
> > > D 511 0 to 0.6
> > > D 512 4 to 5
> > > D 510 86 to 91
> > > D 505 0
> > > D 509 30
> > >
> > > I'm having a hard time deciding if the Scan
> and
> > > Data lines are being pulled down, as it looks
> > > like
> > > the 5 volts isn't being developed in the
> first
> > > place.
> > Anyone seen one of these before?
> > > Ideas??
> > > Starting place??
> > > By the way, the 167 volts remains even when
> the
> > > set
> > > is unplugged.
> > > perhaps something open in the primary?/
> > > Walter
> >
> >
> >
> > =====
> > Walter Wood
> > Future Tech Home Center
> > 2786 Hwy. 43 N.
> > Lawrenceburg Tn. 38464
> > 931-829-3337
> > Fax 931-829-4044
> > mailto:wwood_38478@xxxxxxxxx
> >
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=====
Walter Wood
Future Tech Home Center
2786 Hwy. 43 N.
Lawrenceburg Tn. 38464
931-829-3337
Fax 931-829-4044
mailto:wwood_38478@xxxxxxxxx
__________________________________
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