[TechAssist] Re: Zenith IQB50M90W strange happenings.
- From: Bill Grabowski <bgrabowski@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 16 Nov 2003 17:34:27 -0600
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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