[TechAssist] Re: Zenith 9-1457-1 (sms1943s) no vertical

  • From: "Tech Repair CD support" <support@xxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 17 May 2002 00:00:45 -0400

Gaetan,
First, I suggest getting an  ESR meter.
Since you don't have one, I now recommend changing the few caps in that circuit.
If you have another IC, may want to try that.
I also advised you to check for voltage on the large diode next to the IC to
determine your B+, but I don't see where you said you did this. If this voltage 
is
missing, you need to trace it back. If it is there, change the caps...next
valuable piece of equipment should be an ESR meter.
http://www.anatekcorp.com/testequipment/esr.htm
Jeff
FAX 717-564-4952
Intrepid Video & Electronics
501 Luther Rd
Harrisburg PA 17111-2055
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----- Original Message -----
From: "Gaetan" <techno1@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, May 16, 2002 5:21 PM
Subject: [TechAssist] Re: Zenith 9-1457-1 (sms1943s) no vertical


> Jeff I did check everything in the vertical portion (yes unsoldered res
> &caps ) and ok . (i don't have and esr meter thou , just a capacitance
> meter)
> Even the famous 2.2 ohm , is right on target !
> I even check continuity to and on the yoke (9 ohms).
> As I don't have the schem , 26 volts is applied on pin # ???
> would like to know ...
> and is there any other components to check , that drive signal to vert.IC ??
> I'll check to see a large diode as you say ...
> And the IC wasn't by Zenith before I change it , just normal LA7830 , been
> replaced by same thing (didn't solve the prob)
> TIA
>
> Gaetan Bourgouin
> Techno Logik
> Terrebonne  Que. Can.
> techno1@xxxxxxxxxxxx
> ***Did you know .....
> ... State with highest % of people who walk to work : Alaska. ...
>
>
> At 16:32 16-05-02 -0400, you wrote:
>
>
> Gaetan,
> By "everything looks good", does this mean you ESR's the caps, ohmed the
> resistors?
> I would pull that 2.2 and check out of circuit.
> If you did not order Zenith's IC, I would and see if that works.
> You should really check your supply voltage to the IC, or the large diode
> andsee
> if it is getting to the IC, usually 26v, I think.
> Jeff
> FAX 717-564-4952
> Intrepid Video &Electronics
> 501 Luther Rd
> Harrisburg PA 17111-2055
> Be careful of your thoughts.
> They may become your words any moment.
> Order your tip CD today. Filled with TV, VCR, camcorder tips and more.
> Version 3.0, ready, with more tips, user friendly program.
> $49.00 for CD, plus first year of tip updates.
> sales@xxxxxxxxxxxxxxx for more info
> www.tech-repair.net[1] www.intrepid-video.com[2]
> www.thetoolcaddy.com[3] www.9-11-2001tragedy.com[4]
> ----- Original Message -----
> From: "Gaetan" <techno1@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, May 16, 2002 3:17 PM
> Subject: [TechAssist] Zenith 9-1457-1 (sms1943s) no vertical
>
>
> >Got a 1994 Zenith sms1943s ch: 9-1457-1 (C12)
> >with no vertical deflection ...sound ok , and line across middle of screen
> .
> >Power supply is ok .
> >Have change LA7830 , everything look ok around (caps, res. coil)
> >usual 2.2 ohm resistor is ok too .
> >Check yoke ok (9 ohms on meter)
> >Probably signal doesn't get to LA7830 ....or opened component .... and I
> >don't have the schematic ....
> >Have redone some soldering , checked all the board .
> >What do I miss ??? need help
> >
> >
> >Gaetan Bourgouin
> >Techno Logik
> >Terrebonne  Que. Can.
> >techno1@xxxxxxxxxxxx
> >***Did you know .....
> >... State with highest % of people who walk to work : Alaska. ...
> >
> >
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