Poor vertical linearity (Toshiba 2100TD)

[Guest]

Dietrich, this ones a little harder, check solder connections in and around the horizontal output transistor, resolder horizontal driver transformer,
(check with bright light and magnifying glass), if solder is good, replace the cap(s) off the collector of the horizontal output transistor, one side of
the cap will go to the collector the other side to the emitter (or ground)
these caps are usually not electrolytics but are generally low value
high voltage mylars, not polarized, (you can put them in either way)
good luck, Larry E

[dfahren]

@guest who recommends to replace all caps of the vertical driver unit
Okay, I agree that might be the best option if you don't own any testers, ocilloscopes and the like.
No I didn't hear any pop. No electrolytic cap explodes. (You must be pretty nasty to those caps to get them exploded in an instant ... )
As you recommend, I will lean away all caps and resistors that seem to be very close to heatsinks (there are a few as far as I remember).
Oh my dear! Replacing all caps that are good for temperatures up to 85°C? Poooh, I want to see some programmes not actually the innards of my tv .... I will see to get high degree caps anyway. Thanks for the hint!
Cheers, Dfahren

[dfahren]

Larry, thanks for the remark. I will check the connections of the ON4409 (horizontal output driver) and I will resolder the driver transformator (never would have thought of this one, really!) as you said.
As far as the cap of the horizontal output transistor is concerned, I think it must be the C416, 270pF, isn't it? There is another cap C463. It as an exclamation mark next to it which means it is a critical one. I think you don't mean this one, right?
BTW, I replaced C303 and C317 in my tv set and, voilà, the picture has fine linearity like on the first day. However, I notice at the very first inch on the top of the picture that lines are still widely separated. Do you think that some other component also suffered a failure like the zener diode D315, for example?

Cheers, Dietrich

[Guest]

Hi All!

Thank You for a help! My TV now working good.
I found a brown 1uF @50V capacitor behind a heatsink.
Now it's changed and I am very happy!
Regards,
Tibor

[Guest]

Dietrich, any of the caps that are in paralell with the horizontal output
transistor could be bad causing insufficient width, you may find that soldering the horizontal driver transistor or the driver transformer will
fix it, as for the vertical at the top you may have to change that diode
or adjust the vertical height/ size pot just a little, I don`t have a service
manual for your model as it is different than the USA sets so the numbers
you are giving me don`t tell me anything, sorry that`s all the info I can
give you, Larry E

Hey Tibor glad you found it, Larry E

[ja]

kjčopi,