[TechAssist] Re: Panasonic CT27G31U Chassis AEDP272 (UPDATE)
- From: MDileo0000@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 27 Feb 2004 13:39:58 EST
I could not find a direct reason for the failure of the regulator in this
set, other than it runs very hot. However, the thermal rating of this regulator
is high, 115*C at the heatsink plate and 150*C at the junction of the
switchting MOSFET. B&D has a data pdf that lists the whole series of
STK730-xxx.
http://www.bdent.com/cgibin/htmlos.cgi/1931.2.092502606813269040/push/STK730-0
20.PDF
I put a -050 in and seems to run cooler, at least I can hold my finger on it.
This is probably because of the lower ON resistance, 0.8 vs 0.3 ohms.
There were a bunch of Hitachi models around 1990 that began to fail because
the entire current load of the 12 volt standby crept up as the circuit
electrolytics became resistive. This issue with these Panasonics may be similar.
Thank you all for your assistance, and Rocky for not bitching at me.
Dominic DiLeo
Atlantic TV
Freeport, Maine
[Unable to display image]
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In a message dated 2/25/04 2:11:07 PM Eastern Standard Time,
MDileo0000@xxxxxxx writes:
> Hi Folks,
>
> I serviced this for a shorted regulator, IC801 and blown primary fuse 3
> months ago and it is back with the same failure. I replaced the regulator,
> STK730-020, once again and the run voltages are normal, but the regulator
is
> too hot
> to lay my finger on. I have had a few of these recently and all seem to
have
>
> hot regulators. Is there something causing this or is it normal? Could not
> find
> anything in the archives or members tips. If someone could upload to the
> members area a schematic of any Panasonic/Quasar that uses this regulator,
> it would
> be appreciated. Thanks again,
>
> Dominic DiLeo
> Atlantic TV
> Freeport, Maine
>
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