[TechAssist] Re: Broksonic 13" CTVG-4563TT (DEAD) (FIXED)

  • From: "techforce" <techforce@xxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Sat, 26 Jan 2002 19:14:46 -0500

Thanks Jeff.
The Main Power relay wasnt engaging. Turns out the Transistor (Q104) that
grounds that (2SC2001) was getting a Good 5V Signal from the Micro when you
pressed power, but it would not give me .7V drop on E-B, only 5V. Took out
the Transistor, which checked good on bench, so I dropped in a 2SC945 and it
works. Not sure if the old one was in backwards, as someone had worked on
this before. They both cross to an NTE85 so that ought to be fine pending
another Lightning strike. <grin>
Heres the whole lowdown, and I'd add it to the Tips base for this group, but
so far no User Name or PW comin my way ...

Broksonic CTVG-4563TT (DEAD, Posible Lightning hit)

D125 leaky (1n4148 equivalent)  :Approx 1.6K Ohms both ways.
Q104 (2SC2001) Bad or Installed Backwards,  replaced with 2SC945.
Check IC104 (78L05) for good Output. All Effect drive Relay Coil to engage.

Steve
Technotronic Dimensions, NY (USA)
www.100megspop2.com/techforce
1-877-817-9885


----- Original Message -----
From: "Jeff Dougherty" <jeff@xxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, January 26, 2002 10:27 AM
Subject: [TechAssist] Re: Broksonic 13" CTVG-4563TT (DEAD)


>
> Steve,
> Look for a supply diode or resistor from the Flyback and check those.
>
> Jeff
> Order your tech repair CD today. Free tip updates for one
> year.($49.00)over 50,000 repair tips
> www.tech-repair.net
> Also visit www.intrepid-video.com www.thetoolcaddy.com
> www.9-11-2001tragedy.com
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of techforce
> Sent: Friday, January 25, 2002 12:00 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Broksonic 13" CTVG-4563TT (DEAD)
>
>
> Greetings Techs:
>
>                            No relay clik, no power except 15V on the
> LM7805
> Regulator which is sending out 5V to the Power Relay, but dont seem to
> be
> engaging. The Diode accross the relay measured 1.2K both ways, so
> changed
> it, same thing. Also Changed 78L05 as precaution, same problem.
>
>                            Someone already changed the Vert IC, and the
> 7809
> 9V Regulator next to it, those have no power on them also.
>
> Steve
> Technotronic Dimensions, NY (USA)
> www.100megspop2.com/techforce
> 1-877-817-9885
>
>
>
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  • » [TechAssist] Re: Broksonic 13" CTVG-4563TT (DEAD) (FIXED)