[TechAssist] Re: Zenith IQB50M90W strange happenings.
- From: "Garbage" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 17 Nov 2003 07:23:48 -0500
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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