[TechAssist] Re: Emerson TV 27" TC-2555DA - +B Question

  • From: <tvservice@xxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Wed, 4 Feb 2004 14:49:30 -0600

thats about right +120-125 volts
the external circuit for that regulator lets it output more.
 like a LM7805 with the ground pin flouting on a resistor raises the output

Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
Dallas, TX

----- Original Message ----- 
From: "David Lessard" <mr_fixit@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, February 04, 2004 11:42 AM
Subject: [TechAssist] Emerson TV 27" TC-2555DA - +B Question


> Unit came in dead, found shorted HOT, replaced with D1556, found open
> 4.7ohm/2watt resistor (R521) which feeds raw DC to regulator STR30110,
> found regulator (STR30110) outputting 155VDC, replaced it with original,
> TV fired up with no vertical deflection, replaced LA7838 with original
> (and a few caps just to be sure), now TV works fine except I'm a bit
> confused about the regulated voltage. This STR30110 is outputting 125VDC
> (exactly), one would think being an 110V regulator that that's would it
> would output. Is this the +B operating voltage for this TV? No +B trim
> pot here, just fixed resistors and a zener I think. Thanks in advance.
>
> David Lessard
> Alexandria Electronics
> Alexandria, Ontario
> K0C-1A0
> mr_fixit@xxxxxxxxxxxx
>
>
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