[TechAssist] Re: Sylvania 27U104 vertical problem
- From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 1 May 2002 15:01:02 -0500
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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