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

  • From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 13 Sep 2003 09:12:08 -0400

YES!
Phil Bader

Jim Myers wrote:
> 
> 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
> > >
> > >
> >
> ****************************************************************************
> > *
> > > Classifieds! Buy or Sell!
> > > http://sell.tech-assist.org
> > > The Tech Address Book:
> > > http://www.tech-assist.org/secure/tip/contact.htm
> > > Add a Repair Tip Here, or Change/Remove your Email Address:
> > > http://www.tech-assist.org/secure/tip/main.htm
> > > Lost Password:
> > > http://www.tech-assist.org  and select "Lost your Login Info?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> > >
> >
> >
> >
> ****************************************************************************
> > *
> > Classifieds! Buy or Sell!
> > http://sell.tech-assist.org
> > The Tech Address Book:
> > http://www.tech-assist.org/secure/tip/contact.htm
> > Add a Repair Tip Here, or Change/Remove your Email Address:
> > http://www.tech-assist.org/secure/tip/main.htm
> > Lost Password:
> > http://www.tech-assist.org  and select "Lost your Login Info?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
> >
> >
> ****************************************************************************
> *
> > Classifieds! Buy or Sell!
> > http://sell.tech-assist.org
> > The Tech Address Book:
> > http://www.tech-assist.org/secure/tip/contact.htm
> > Add a Repair Tip Here, or Change/Remove your Email Address:
> > http://www.tech-assist.org/secure/tip/main.htm
> > Lost Password:
> > http://www.tech-assist.org  and select "Lost your Login Info?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
> >
> 
> ****************************************************************************
> *
> Classifieds! Buy or Sell!
> http://sell.tech-assist.org
> The Tech Address Book:
> http://www.tech-assist.org/secure/tip/contact.htm
> Add a Repair Tip Here, or Change/Remove your Email Address:
> http://www.tech-assist.org/secure/tip/main.htm
> Lost Password:
> http://www.tech-assist.org  and select "Lost your Login Info?".
> Email Archives:
> //www.freelists.org/archives/techassist/
> 
> ****************************************************************************
> *
> Classifieds! Buy or Sell!
> http://sell.tech-assist.org
> The Tech Address Book:
> http://www.tech-assist.org/secure/tip/contact.htm
> Add a Repair Tip Here, or Change/Remove your Email Address:
> http://www.tech-assist.org/secure/tip/main.htm
> Lost Password:
> http://www.tech-assist.org  and select "Lost your Login Info?".
> Email Archives:
> //www.freelists.org/archives/techassist/
> 
> *****************************************************************************
> Classifieds! Buy or Sell!
> http://sell.tech-assist.org
> The Tech Address Book:
> http://www.tech-assist.org/secure/tip/contact.htm
> Add a Repair Tip Here, or Change/Remove your Email Address:
> http://www.tech-assist.org/secure/tip/main.htm
> Lost Password:
> http://www.tech-assist.org  and select "Lost your Login Info?".
> Email Archives:
> //www.freelists.org/archives/techassist/

-- 
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

*****************************************************************************
Classifieds! Buy or Sell!
http://sell.tech-assist.org
The Tech Address Book:
http://www.tech-assist.org/secure/tip/contact.htm
Add a Repair Tip Here, or Change/Remove your Email Address:
http://www.tech-assist.org/secure/tip/main.htm
Lost Password:
http://www.tech-assist.org  and select "Lost your Login Info?".
Email Archives:
//www.freelists.org/archives/techassist/

Other related posts:

  1. Home
  2. techassist
  3. Archive
  4. 09-2003