[TechAssist] Re: Sanyo TV AVM27F3, retrace lines at top of screen
- From: becyn <becyn@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 27 Dec 2005 12:55:26 -0500
Shorted zener in the output circuit????
Jim McVey
McVey Alltronix
327 Broadway
Newburgh N.Y. 12550
"If it doesn't play...
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Gary McCartney wrote:
>Ed, this set uses a TDA8358J as the vertical output IC. I have replaced
>5 caps around the vertical heatsink and still no difference. Also
>replaced a couple of them on the CRT board, along with the blue 0.0022uF
>disc cap at the G2 pin.
>
>Does anyone have a print of the deflection circuit for this model?
>(sorry but I don't see a chassis number anywhere on it). I want to check
>the B+ line and the blanking to the vertical.
>
>One thing I should mention is the flyback I just got for the set. The
>original one had this number on it:
>
>MCJ-29A005 11226239
>
>The one I received has this number on it:
>
>MCJ-29A003 11226237
>
>Otherwise, they both look to be identical.
>
>I have played with the screen control some more. When I take it down to
>the very low end, instead of the picture going totally black, it does
>another thing. The contrast goes really high. Is this a function of some
>sort of IK circuit trying to compensate?
>
>
>
>
>
>Gary McCartney
>
>McCartney Electronics
>Guelph Ontario Canada
>Est. 1984
>email: gary (at) number63.ca
>
>
>
>
>
>
>
>
>Tel-Tek Electronics wrote:
>
>
>>Gary; I suspect a blanking pulse problem...which likely will be a cap, but
>>not in the vertical section. What is it using for a Vertical O/P.
>>If you remember..I asked you about that LA4847 IC. That IC is now being
>>integrated in other circuits.
>>No longer a Vert drive/pumpup/output IC.
>>
>>-Ed-
>>
>>
>>"Seasons Greetings"
>>
>>Tel-Tek Electronics
>>Ontario-Canada
>>
>>teltek3@xxxxxxxxxxxx
>>teltek@xxxxxxxxx
>>----- Original Message -----
>>From: "Gary McCartney" <gary@xxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Saturday, December 24, 2005 3:42 PM
>>Subject: [TechAssist] Sanyo TV AVM27F3, retrace lines at top of screen
>>
>>
>>
>>
>>
>>>I bought this set at an auction. The flyback B+ was shorted to ground.
>>>Replaced flyback and set works now but there are 3 retrace lines at top
>>>of screen, about 1/2 inch apart. One each of blue, red, green. Adjusting
>>>screen control down takes it way but picture is too dark then.
>>>
>>>I was hoping to get this set ready for Christmas day but time is running
>>>out now.
>>>
>>>Is it a cap in the vertical?
>>>
>>>Thanks for any help and have a Merry Christmas everyone.
>>>
>>>Gary
>>>--
>>>
>>>
>>>
>>>
>>>Gary McCartney
>>>
>>>McCartney Electronics
>>>Guelph Ontario Canada
>>>Est. 1984
>>>email: gary (at) number63.ca
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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