[TechAssist] Re: Sanyo 31" DS31590 dead, HOT shorted. other???
- From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 14 May 2003 12:27:14 -0400
I finally ordered another Sanyo 2SD1879 HOT (Q402) and replaced the cap
C408 (4.7/160V)in the H. drive transformer circuit.It was just a bit low
value at 4.3 mfd.Peace of mind replacement.Resoldered all over the area
as well just to be safe. Before hand, I ran the set with my "test" HOT
for days with no problems, so yoke is probably OK, HOT ran cool as
well.My final replacement 2SD1879 runs cool,too. Maybe this was just a
power fluctuation in the home.Happens.
Phil Bader
armando guerra wrote:
>
> Check and see if there is a C408,4.7mfd\160v. If there is one ,I would replace
> it.
> Another thing that I have seen take out the hot is an int.short in the yoke.
> Run it at least 3 hrs to be sure.
> Mando
> Birdie's TV & Electronics
> Casa Grande, AZ
>
> Philip Bader wrote:
>
> > Sanyo DS31590 (31590-02 chassis)Came in dead.
> > Customer said no storm at time.Tried to turn on.Must have failed in the
> > off mode.
> > Only damage I found was shorted HOT Q402 (2SD1879). I removed HOT and
> > in place, my 60 watt light bulb from collector of HOT to ground (emitter
> > ckt) for a load.Plugged in set to see standby voltages.Immediately the
> > brightness of my 60W bulb started cycling on/off, averaging about 46VDC
> > in standby.
> > In standby mode with the 60W bulb removed (and no HOT as well) I had a
> > stable +81.5VDC.
> > I reinstalled my bulb to HOT collector and pushed power, and set
> > clicked on with bright light and a stable +126.5V for about 5 seconds
> > and set clicks off.Push power,same 5 seconds then off again.
> > I then replaced the HOT with my new sub HOT D1555 (also an NTE 2331
> > equiv., not exact, but I had a bunch on hand). Stand by volts on
> > collector, +81.5 VDC.
> > Powered unit up with good pix, regulation and sound. My HOT runs barley
> > warm.
> > Close inspection found all good solder in the HV areas,including H drive
> > transformer, tho I reflowed all anyway with solder to be sure.
> > I am wondering if there is any histories on this model where just the
> > hot goes without any other defects?
> > Phil Bader
> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> >
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--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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