[TechAssist] Re: Toshibas, CF3566A,CF3572B,(TAC9190)shut down issues,fixes

  • From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 12 Sep 2003 09:22:11 -0500

Don, go back and read the original post from Phil, he calls Q840 LM78MR05,
I'll bet it is the 5 pin L78MR05 after all. How about it Phil?
**************************************************
Jim Myers
Since 1972
Telrad Electronic Services Co.
Fort Wayne, IN 46815
*************************************************
----- Original Message ----- 
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 11, 2003 5:12 PM
Subject: [TechAssist] Re: Toshibas, CF3566A,CF3572B,(TAC9190)shut down
issues,fixes


Oops! The 5 pin one with reset output is L78MR05, it is used extensively in
Toshiba sets so I guess I just Ass-U-Me'd.
Sorry,
**************************************************
Jim Myers
Since 1972
Telrad Electronic Services Co.
Fort Wayne, IN 46815
*************************************************
----- Original Message ----- 
From: <hartstv@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 11, 2003 5:02 PM
Subject: [TechAssist] Re: Toshibas, CF3566A,CF3572B,(TAC9190)shut down
issues,fixes


Hi Jim,Are you sure the L78M05 is a 5 pin??I checked my NTE & Partsminder
source & they all come up as 3 pin regs,ie NTE 960 or NTE 1960..............
Don of HARTS-TVCR-ASC
9 Robert St,Oromocto,NB,Canada,E2V3N2
Tel-506-357-9785,Fax-506-357-6010
hartstv@xxxxxxxxxxx



----- Original Message -----
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, September 11, 2003 6:38 PM
Subject: [TechAssist] Re: Toshibas, CF3566A,CF3572B,(TAC9190)shut down
issues,fixes


> I would suspect that the L78M05 was bad but not because of the 5v VCC
output
> being too high, rather that something was wrong with the reset output pin.
> This is a 5 pin device and is used to reset the micro as well as supplying
> the 5 volt VCC.
> **************************************************
> Jim Myers
> Since 1972
> Telrad Electronic Services Co.
> Fort Wayne, IN 46815
> *************************************************
> ----- Original Message -----
> From: <hartstv@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, September 11, 2003 4:30 PM
> Subject: [TechAssist] Re: Toshibas, CF3566A,CF3572B,(TAC9190)shut down
> issues,fixes
>
>
> Phil,Glad you got your 2 units repaired.I have a question on the Q840 reg
> that you replaced.If it's 3/4 of a volt too hi this will cause shutdown or
> intermittent startup?If it was low by this amount I would have replaced it
> but hi by this amount I would have missed this as a fix.I know you also
> replaced a filter;but I'm just curious as to how you knew to replace the 5
> volt reg.I would assume with the plus & minus tolerance of my meter & the
5
> volt reg,a 3/4 volt difference high would be over looked.Not trying to be
> pickey,very good t/sing on your part.The B+ for the micro's on these units
> must be very critical........
> Don of HARTS-TVCR-ASC
> 9 Robert St,Oromocto,NB,Canada,E2V3N2
> Tel-506-357-9785,Fax-506-357-6010
> hartstv@xxxxxxxxxxx
>
>
>
> ----- Original Message -----
> From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, September 11, 2003 1:58 PM
> Subject: [TechAssist] Toshibas, CF3566A,CF3572B,(TAC9190)shut down
> issues,fixes
>
>
> > Both 35" Toahibas in for shutting down intermittantly, getting
> > progressively worse until one stayed dead.
> > Both Chassis# TAC9190.
> > One came to life replacing an open cap C871 (22mfd/50V) on the smps
> > board.
> > The other came up with the same C871 (22mf/50V) cap plus a regulator
> > Q840 (LM78MR05) that was outputting about 5.75VDC on a pin that should
> > have been a steady 5VDC Standby. Measure that output across the
> > 100mfd@xxxx Cap C844. Near the LM78MR05 IC.
> > Always ESR all caps,and solder good.
> > The group helped a lot with these.Good group.
> > Phil Bader
> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> > For Professional Technicians Only
> >
> >
>
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