Anyone know about these sanyo lcd's? my dp26649 has issues.

[wd409]

Greetings people of video karma, I just found out about you. I've been on audiokarma for a little while now though.

someone there recommended I try this here, so heres the post i made there.


alright, short bio, I do this as a hobby, just to mess around, and try to learn.
but, sometimes that isnt easy. particular for this specific model of tv im about to talk about, to which exhaustive efforts to find a service manual have gone unasnwered. so keep in mind i dont know (exactly) what im doing, but I have a good idea, i think.

alright so heres the thing, I bought this sanyo 26" tv at the goodwill a little while ago, knowing it wouldnt turn on, and praying the screen was ok, cuz the rest is fixable, right..

it had a blown 0.1 ohm fuse-resistor in it, which lead directly to two blown transistors, these transistors read 0000 out of circuit in all directions.

so, I look at their styling code and model, and order new ones, now..
the 16n25c's they sent me are different from the ones I asked for. I asked for FQP, which was a metal back... i get FQPD or something like that, that is not metal, but the rest checks out, so I f igure... why not.

so, the tv powered up, looked good enough, you know, for a sanyo.
everything seemed to be legit about this operation, until a few minutes down the road, when it blew all of those components again.


alright so heres the deal, from those transistors the path leads to the transformer, and from there they go to more transistors, sbt150 or something to that end, I did pull those and test them, they seemed a little low, reading 0.200 in diode test, but all 3 gave that so I didnt think anything of it. other transistors, those new ones for example before I just blew them... would have read 0.600 or so, for comparison.

alright so my question is here where I did go wrong just now. was it the plastic case transistors or did I fail to find something further upstream do you think?

Specific information: tv is model DP26649 chassis -00. above situation refers to the power supply board. the blown transistors are on the reverse side of the heatsink that the bridge rectifier is on. bridge rectifier tested good.
and this tv did work for a few minutes time, with absolutely no indications it was having a problem or about to blow.

Thanks in advance for any suggestions that come my way