Quote:
Originally Posted by avionic
I've got friend with a toshiba model CS30D50 with shorted vertical output.And he needs a schematic, Any help would be much appreciated.
Dave
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Vert out on a LOT of units is the LA7838 integrated circuit (plus about 6 caps) a 13 pin sip power upright flatpack that directly drives the yoke.
subbed by the nte-7039 (yecch i know...)
my toshiba CF35c49 tv uses one- just checked the (paper, sorry)svc man,
as well as this monitor, a mitsubishi diamond pro 87txm which has been running on the nte and new nichicon pw's (3.3uf, 3x220uf, 470uf & 1000uf(low esr?) since march '07 for 24/7 flawlessly.
the (sanyo) la7838 pdf can be found in datasheetcatalog.com or google it.
it has sample application schematics, that's how i fixed my undocumented monitor.
it generates the ramps and drives directly to the yoke. it IS sensitive to the caps going sour, and they get a lot of ripple. the BIG one is probably low esr
sonys use the tda8172, a 7 pin sip power upright flatpack, again directly driving the yoke.