Help with piccolo j-310 pincushion

[Pjaska]

I will order the right cap and report back. There is 4 legged mini transformer that is connected to drive the horizontal output transistor, is it the one responsible of pincushion?

[Alex KL-1]

Originally Posted by Pjaska

I will order the right cap and report back. There is 4 legged mini transformer that is connected to drive the horizontal output transistor, is it the one responsible of pincushion?

No, this is the horizontal output driver transformer, to better couple the pulses (it have a choosen turns ratio for adequately driving the base of H.out. transistor).

[Pjaska]

Hello, i have not ordered the cap yet but i did try to "reverse engineer" the circuit and heres the result:



I also looked in to jungle ic datasheet but i cant understand what to check out and if there is anything that i can adjust to make the picture more barrel shape.

I think where it said on datasheet 110v +b there is not voltages that high on that pin. And other parts of suggested circuits do not match 100% with actual circuits (i have done some schematics of those too but they are not ready yet).
Also when i was fooling around with settings i think it once got really good picture shape when i turned down g2 alot and picture was kind of dim, but when i switched to other game the geometry got really wobly...

[zeno]

This cap had a pretty high failure rate in older sets. I think it was ready to go
& blew on power up. The replacements wont work, they are the wrong type.
We used the OEM replacements as NP caps were hard to find.
Keep in mind the hoz out spikes can be quite high & lots of current.
Example is on a 25" TV the hoz out B+ is @120 volts but the spikes are
@ 1 KV
So I think the right type of cap will fix it maybe the PIN problem also.

73 Zeno
LFOD !