[TechAssist] Re: Zenith60" PVY6067DT had fading filament voltage(fixed) now black,vert protect...
- From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 19 Dec 2003 13:52:52 -0500
I think he did check those, but I will again,althought we do not get the
familiar 3 lines that I have seen before.Just no vertical. Zenith
techassist told me to test for vert drive at the "half way point" by
going over to the main signal board, at top of the 9-1645-01 canister at
connector 2G3 pin 2. Should be vert drive always. If it's present, must
be on the 9-1674 module.
If not, loss of drive can be within the canister mentioned (9-1645-01)
at a scan IC IC2300 (221-778).
With all this, I will do some tests.
Keep'm coming!
Phil
Gemini Computer & TV wrote:
>
> Check R3243 (110K) and R3244 (82K) on the 9-1674 module. Be sure to lift one
> end on them out of circuit to ensure a proper reading (in fact, you may want
> to replace them anyway as a preventive measure as these are high failure
> components. See the following from WINSTIPS:
> ---------------------------------------------------------------
> Text pasted from WinSTIPS 2.0
> http://www.ServiceSoftware.com
> ---------------------------------------------------------------
>
> ZENITH 9-1674
>
> No Raster,2 To 3 Lines Bowed At Top,Has Hv & Snd
>
> Emergency Tv Electronics (Wendell )
>
> Unit Will Have A Raster For 2 To 3 Seconds And Fades To 2 To 3 Bowed Lines
> At Top Of Screen, But No Pix, Only Snd, Cure> Replace R3243 110k 1/2watt
> Resistor Behind H.O.T. Res Will Poss Check Ok But Replace
>
> ---------------------------------------------------------------
>
> ZENITH 9-1674
>
> Picture Bounces - After Repairing Solder On Chassis
>
> Dick'S Tv - Sharon, Pa
>
> Connector 7c3 Loose On Convergence Module
>
> ---------------------------------------------------------------
>
> ZENITH 9-1674
>
> Video inop, has sound, raster looks like convergence problem
>
> Robert Fowler Chassis: GZ
>
> 9-1674 module: R3243 110k-1/2w open
>
> ---------------------------------------------------------------
>
> ZENITH 9-1674
>
> Video inop. Just R,G, & B arcs on screen. powers up/has audio
>
> J Eggleston
>
> R3243 110k/1/2w resistor near h.o.t. on 9-1674-1 board
>
> ---------------------------------------------------------------
>
> ZENITH 9-1674
>
> Video No Ho. Hv Ok. ( Loss Of Filaments)
>
> Gray'S Electronics Inc.
>
> Check The Solder On The Connector At The Top Of The Daughter Board That Goes
> To The Crt Boards. I'Ve Had Bad Solder On This Connector Cause Loss Of
> Filaments
>
> ---------------------------------------------------------------
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager / Parts Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxxxxxxx
> geminitv@xxxxxxx
> www.geminicomputertvsecurityalarms.com
>
> ----- Original Message -----
> From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, December 19, 2003 1:20 PM
> Subject: [TechAssist] Zenith 60" PVY6067DT had fading filament
> voltage(fixed) now black,vert protect...
>
> > OK. We installed originally an OEM Zenith HV splitter block.Customer
> > picked it up at shop. Ran a month then Customer said after on awhile the
> > picture faded to black.In shop, while on I pushed down on the
> > power/deflection 9-1674. I saw the picture slowely fade in again. The
> > CRT filament voltage was intermittant. Simple enough...
> > No...
> > We carefully removed the 9-1674 and benched it. Indeed, many cracked
> > solder connections as well as at the top edge of the upright daughter
> > board on it,where a plug goes at "3B5".
> > My tech is very careful and detailed in his work especially doing small
> > SMD flat packs,etc. He reflowed the board. Installed it again and the HV
> > and filament came up and ran OK.
> > But...
> > Black screen. SLOWELY advancing one G2 revealed a line: No vertical
> > deflection, so the set blanks out the video as a safety feature.
> > We pulled that board 4 times. went over it under hi magnification. It
> > looks like a clean job. He even replaced the LA7838 vert IC just to see.
> > Every wire seems in place. This is becomming a nightmare.
> > Now I'm not positive the lack of video,hence no vertical is a problem on
> > this 9-1674 board. Please assist! X-mas approaches. Deadlines...
> > I don't want a new -1674 board and find out it's elsewhere.
> > I need you guys!
> > Thanks in advance,
> > Phil Bader
> > --
> > Philip Bader
> > Jan Phyl TV Inc. (estab. 1976)
> > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > Fax (863) 299-8821
> > email: tjanphyl@xxxxxxxxxxxxxxx
> >
> >
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--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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