Question about Sanyo DS31590 31" TV
I do know how tofix tv but i can not find a scmatic for my tv online I have a sanyo MTS model number is DS31590. Can you please help me thank you.
Finding schematics anywhere has become a real chore; even Sams doesn't bother to try to keep up with the flood of new stuff coming out all the time.
You state that you can fix it; well maybe. If you have a multimeter you can at least check a few things:
Locate the flyback, it's a largish clump of plastic normally found near a corner and with a large diameter cable sprouting from the top and attached to the CRT. Right close to that, you will find a heatsink with one (sometimes two) larger epoxyed components. The one with three leads is the flyback or horizontal output transistor. If there is a second component, it will be the damper diode with only two leads although these are normally inside the transistor now.
If you have a diode symbol on your meter, use that, if not, choose the the 2K resistance range. On the transistor, check between the outer leads, swapping the meter leads (and their polarity). If you measure something low that isn't quite a short, it's probably OK. Check between the center lead (collector) and each outer lead (base and emitter). The terminology changes for a FET but bipolars are still more common in this position. Regardless of lead orientation, none of the measurements should be as low as the first between the outer leads. If you seem to be measuring a piece of wire, that part is bad.
Now, replacing that part may just waste money since it is fairly common for the transistor and the flyback to fail together and you aren't likely to find a flyback anymore for that set.
The transistor PN will start with an SD or SK; you need to add a '2' in front for a complete part number; i.e. if it says 'SD1142' the full number is 2SD1142.
You are not likely to find the part you need and most suppliers have minimums you must meet. That part probably isn't more than $10 US if you can find it. If you can't, try NTE:
NTE Cross reference
Considering all the problems folks are having with their flat panel TVs, saving your CRT version isn't a bad idea.
Posted on Dec 01, 2008
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