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Discussion in ‘Hobby Electronics’ started by alitonto, Apr 24, Digitor 12 volt portable tv for car – mistery Reply to Thread.
(PDF) LA7680 Datasheet download
Search Forums Recent Posts. Apr 24, 1.
Digitor tv model G pcb B The tv does not start; there is Checking the circuit board I see the base is connected via a resistor to ground and via a high voltage ceramic cap back to the emmiter line of the HOT. Shouldn’t somethingelse be feeding the base or do these 12 volt tvs work differently?
Any thoughts will be very much appreciated. Apr 24, 2.
Apr 25, 3. Yes I am quite sure because the emitter pin is directy soldered to the ground of the circuit board. I am starting to suspect that someone has tried to repair this and removed some wire coming directly from an IC. Anyone got schematics on this TV can they please tell me where the drive to this HOT should be coming from. It adtasheet make this easier.
Apr 26, 4. Apr 27, 5.
The internal block circuit diagram of LA7680 IC
Thanks for the info as I datassheet find who makes these tvs; I will follow up for a schematic with DSE but in the meantime I would like to know if the voltage at the collector of the HOT for these portable 12v tvs in general should be as the bigger ones. I have measured Apr 27, 6.
Apr 28, 7. This tv has these ICs: Apr 28, 8. Apr 29, 9. Special thanks to Frank for assisting me realise that I was looking for the wrong IC info; I didn’t think that the LA on the tv had plenti of legs; for some reason I was convinced it was only 24 pns. I have now obtained the correct datasheet. Great help thanks A.
LA Datasheet PDF – SANYO -> Panasonic
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