Thanks Dan,
That wasn't the problem exactly but, it was the right area. There was
a 470uf @ 16V just off D001 that had shorted and killed the power. Replacing
the cap fixed the set.
Peter Oliver
Tucson Radio TV
From: "Webster TV" <webstertv@xxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: <techassist@xxxxxxxxxxxxx>
Subject: [TechAssist] Re: Quasar SP2019DV dead-very dead
Date: Mon, 20 Jan 2003 13:13:46 -0600
Peter,
Check and see if you have the standby 12v on the cathode of diode D001(part
# ERA15-01), D001 is located off of the secondary of transformer
T001(standby).If there is no 12v standby voltage, check D001 first. I had a
set this past fall that was completely dead from storm damage and this 12v
standby voltage was real low. D001 checked OK. Found pins 22 & 61 of
IC001(MPU)(#MN1873265T9G) shorted to ground. Also found shorted diode
011( #MA165 or NTE519), the cathode of D011 should hook up to the same trace
as the cathode of D001, but after jumper JS012. Replacing IC001 and diode
D011, brought the TV back to life, but you couldn't turn the set on or off
right, with the power switch. I found defective transistor Q001(#MSD601) in
the on/off relay circuit, that solved this problem. Q001 is a printed
circuit mounted transistor on the bottom of the chassis. I have the
panasonic schematic for this set, but no way of scanning it for you.
Dan Webster
Webster's TV
Shullsburg, Wi.
----- Original Message -----
From: Peter oliver <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, January 18, 2003 4:02 PM
Subject: [TechAssist] Quasar SP2019DV dead-very dead
>
> Quasar
> SP2019DV
> Chassis AEDC277
> MFD 1997
> Sams# 3893
>
> This set is quite dead. Not even standby voltage. The AC feeds to the
> standby transformer and the transformer will output ~15VAC unloaded. in
> circuit it gets strange on my meter it reads 9.7VAC one direction and
0.8V
> the other with 4VDC accros the transformer secondary. There is no voltage
to
> the 5 & 9 V regulators and I can't find any voltage after the standby
> transfomer to speak of. This set uses a STR58041 in its primary switch
mode
> supply but since the relay doesn't have power to its coil that would seem
> not to be in play. Has anyone run across this fault before or have an
> electronic copy of the schematic? There is a possiblity of a power surge
> although I don't see any direct evidnece and we haven't had a storm for 6
> months and it is 75 degress outside.
>
> Peter Oliver
> Tucson Radio TV
> (note to send me large files I have an account at another server that
> doesn't have an attachment size cap, I can send that address to those who
> might need)
>
>
>
>
>
>
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