[TechAssist] Re: Sylvania 27U104 vertical problem
- From: "Tech Repair CD support" <support@xxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 1 May 2002 23:09:31 -0400
Larry,
Also examine the solder pads real closely.
I have lifted one side of one of these solder pads, and took a while to notice
it
because I saw the trace on the other side of the component.
Jeff
FAX 717-564-4952
Intrepid Video & Electronics
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Harrisburg PA 17111-2055
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----- Original Message -----
From: "Larry E." <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 01, 2002 5:05 PM
Subject: [TechAssist] Re: Sylvania 27U104 vertical problem
>
> Jim, had B+ to pin 2 but tried D550 anyway but to no avail, I`m going to
> order another Vert. IC, can`t find any bad parts around vert. circuit,
> thanks for the reply, Larry E.
>
> Jim Myers wrote:
>
> >The customers original problem of intermittent vertical collapse sounds like
> >the old pump up diode problem of the C8 and C9 chassis era, once in a while
> >the vertical would collapse and pop right back to normal. That would be D550
> >in this chassis and it was D550 way back then too. Worth a try, you can
> >replace it with an NTE580 type diode.
> >Jim Myers
> >Telrad Electronic Services Co.
> >Fort Wayne, IN 46815
> >jr.myers@xxxxxxxxxxx
> >260-432-4486 Fax and Voice
> >Fax is always on
> >----- Original Message -----
> >From: "Larry E." <videotech@xxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Wednesday, May 01, 2002 2:17 PM
> >Subject: [TechAssist] Sylvania 27U104 vertical problem
> >
> >
> >
> >Hi all, I`m working on a sylvania model SPC2785 104 chassis 27u104-OOBB
> > customer said picture would interm.
> >collapse vertically and then pop back to normal for several weeks, then
> >set died. when we got there set would click
> >on, HV would come up momentarily then collapse, had to push power button
> >twice to get set to repeat that
> >process, replaced vertical output IC and set comes on and stays on with
> >total vert. collapse but line is not straight,
> >has erratic shape to line and picture appears to be jumping or may be
> >rolling, esr`d all caps in vert. section, B+ to
> >IC is good, pin 7&8 of IC are incorrect, and not stable, 1.92-2.15 volts
> >fluctuates up and down constantly,
> >checked all resistors and caps off these 2 pins and find no problem
> >parts, I`m lost at this point, any help would be
> >greatly appreciated, Larry E. American TV & Electronics
> >
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