Toshiba CF27E50 squashed vert

"Adam Stouffer" bravely wrote to "All" (29 Jun 05 03:42:47)
--- on the heady topic of "Toshiba CF27E50 squashed vert"

AS> From: Adam Stouffer <adam_stouffer@xxxxxxxxxxx>
AS> Xref: aeinews sci.electronics.repair:51856

AS> Hello all, I acquired a Toshiba CF27E50 tv that seems to have a
AS> problem with the vertical. The picture is squashed about 2 inches
AS> below the top of the screen.

AS> I ordered the schematics and service info from Sams and checked all
AS> the voltages on the TA8427K vert amp chip and they were ok. The
AS> service info said to replace 4 caps which I did (but with pulls from
AS> scrap). So their condition may be questionable.

AS> Is it worth looking at anything with a scope or should I just replace
AS> the TA8427K and all the caps in the surrounding area? Thanks.


Adam,

There is often a rectifier diode associated with the pump-up circuit.
It may have gone high resistance and should be replaced along with all
the electros around the vert-ic. Also check for the proper supply
voltages. If the fbk derived vertical supply is low this could also be
caused by a high resistance recitifer, bad filter electro, or high
value dropping resistor. Inspect the yoke plug for good solder.

A*s*i*m*o*v

.... :<) What does that wire do? =8<Q (oh!)

.

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