[TechAssist] Re: Zenith IQB50M90W strange happenings.
- From: walter wood <wwood_38478@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 17 Nov 2003 06:49:19 -0800 (PST)
As near as I can find there are 9 fuses total.
7 on the power supply/deflection board and 2 on the
analog convergence board.
All check good.
Correct me if I'm wrong.
Thanks
Walter
--- Garbage <damon101@xxxxxxxxxxxxxx> wrote:
> There's another thing I've seen too and that's
> the convergence fuses blowing
> and that can kill the power supply too......it
> doesn't hurt it, but the smps
> just won't start/stay on.
>
> They are paired together in the SMPS, near each
> other, but I can't give you
> location. Good luck. I think they are 7 amp
> yellow picofuses. I've had those
> blow and the amps are still ok.
>
> Damon Brunger
> Telrad Electronic Services
> Ft Wayne, IN 46815
>
> ----- Original Message -----
> From: "Bill Grabowski" <bgrabowski@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, November 16, 2003 6:34 PM
> Subject: [TechAssist] Re: Zenith IQB50M90W
> strange happenings.
>
>
> > There's a green Hitachi fuse off the screens of
> that model that will
> > short the diode off the screen B+ that will
> give you a dead set. I don't
> > have my data at store. I had similar problem
> with IQB50M88W. Both of
> > these models are Hitachi........GoodLuck I
> could not get individual
> > parts. Had to purchase deflection/power supply
> board from Zenith.
> >
> > Bill
> Grabowski
> >
> Triangle Appliance
> >
> > walter wood wrote:
> > > This is the Hitachi made for zenith.
> > > Zenith manual calls it the ZP88,90,and 92
> > > chassises.
> > > It's more like the Hitachi AP73/74 series
> than the
> > > AP8xxx and AP9xx.
> > > Set came in with total convergence failure,
> but did
> > > play.
> > > For no reason that I can think of, it is now
> a dead
> > > set.
> > > I went ahead and replaced reset ic and diode
> that
> > > is supposed to fix the convergence.
> > > I've also replaced regulator I901.
> > > Trying to follow the diagnostic LEDs is
> impossible,
> > > and I hope someone has some ideas.
> > > The front led is not lit, but pulses ON
> briefly
> > > when most of the green leds go OFF.
> > > I say most because D947 is ON all the time.
> > > D946 turns ON briefly as the rest of the
> green leds
> > > turn off.
> > > The red protect D912 is ON DIMLY while all
> the
> > > green leds but D964 are ON, but Flashes
> bright, as
> > > the Green ones go off then it(the red) turns
> OFF.
> > > It repeats this cycle on and on.
> > > Of course the troubleshooting chart has
> nothing
> > > about this kind of behavior interpiting the
> leds
> > > fault.
> > > The regulator I901 has 177vdc on pin 1 and it
> does
> > > not vary.
> > > The other pins seem ok voltage wise except
> pin 5
> > > which is about half what it should be.
> > > These do turn off and on where pin 1 does
> not.
> > > Over on the secondary the voltages are down
> by more
> > > than half and turn on and off.
> > > Horizontal output seems ok, and I don'e see
> any bad
> > > solder.
> > > I'm stuck!!
> > > TIA
> > > 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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> > --
> > *****************************
> > Bill Grabowski
> > Triangle Appliance
> > Kenosha,Wi 53142
> > 262-694-6500
> > 262-694-6523 fax
> > bgrabowski@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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