[TechAssist] Re: Reg B+ value for Emerson TC2555DA
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 14 Sep 2003 02:03:16 -0400
Bob, that circuit is designed to be like that. Below is a couple of
related messages I had saved:
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
---------------------------------------------------------------------------------------------------
Date: Wed, 6 Dec 2000 09:39:22 EST
From: Lo1297@xxxxxxx
Subject: Sansui TV Model TVM1315A, repaired
Hello to all,
I thank all of you that responded to the turn off problem of the Sansui
TV
model TVM1315A, especially thanks to Joe @joetech, Ronnie @IEPlayer,
Tommy @tabnix and Richard @rickstv.
This is the Sansui tv that would turn off (via x-ray diode D402) uppon
turn
on.
I found that by reducing the line voltage the set would stay on. By
turning
up the ac voltage, causing the B+ and HV to increase the set would go
off at
a B+ of 128vdc (pin-4 or TP501 should be 137vdc), and as HV would reach
28kv
(should be 26kv) .
Since the B+ regulator was a STR30110 many thought the regulated
voltage at
IC501-4 should be 110vdc and therefore the regulator must be defective.
However in this application with Orion tv sets using STR30110 the output
regulated voltage should be and is 137vdc.
In this case capacitor C443, .0047@xxxxxx, located in the collector of
H.O.T.
Q401 would change with current flow and affect the output waveform.
Replacing
C443 corrected the turn off problem.
The proper voltage at IC501 and the H.V. output is as follows:
H.V. output is: 26kv
Regulator IC501 with line voltage set at 115vac :
1= Ground 4= 137vdc (TP501)
2= 134vdc 5= 6.5vdc
3= 180vdc
Hope this will help someone in the futher.
Have a nice day, God bless.
Herb from Farmington Hills, Mi.
----------------------------------------------------------------------
Date: Wed, 14 Mar 2001 14:57:08 -0500
From: "Dwight's T V" <dwightstv@xxxxxxxxxxx>
Subject: Re: Emerson TC2587DA horiz. piecrusting, shutdown, etc...
This sounds familiar.
It's regulator trouble.
Check circuit on regulator pin5.
If you don't find anything try replacing the regulator with a STR30120
or STR30123 and leave pin5 open.
If i'm not mistaken the tv uses a 30110 and the circuit an pin 5 makes
it
regulate at 120v.
jim
---------------------------------------------------------------------
Gemini Computer & TV wrote:
>
> Very interesting. The manual shows it to have an STR30110 regulator but pin
> 4 (output) and B+ test point show it to be 124 volts.
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
>
> ----- Original Message -----
> From: <HSWAD@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, January 24, 2003 2:18 PM
> Subject: [TechAssist] Reg B+ value for Emerson TC2555DA
>
> >
> > <PRE>Need the value of the regulated B+ for an Emerson Tv Model TC2555DA.
> Thanks a
> > bunch, Hollis Bates
> > ------------------------------------------
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