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Another Inverter Question...I315b1-16a

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scooby-doo:
hi

Seen this problem a couple of times and thught Id ask?

With this inverter board I315b1-16a(quite a common one, Ive attached a picture)

I have one that all the caps are ok, transformers all read near on the same, fuses ok..but the set still does the flash for 1 second then go out..(I know it is the inverter as tested with working one).

Where the hell is the fault on these boards???
Surely there is a repair kit looming on this one Andy??

jimca007:
had a few of the cmo inv  having duff mosfet IC's the wee 4 legged ones spaced along the board

scooby-doo:
Cheers Jimca

Learning Curve question...Can these be tested in circuit...and ermmm what am i looking for sc/oc etc etc

jimca007:
you cant really test a mosfet in circuit with a multi meter to see if its switchin properly etc but you can do a wee go/no go with your meter . To get the exact wiring of the chip used you'd need to look it up[ but many are 4 legs on one side joined together and the other side going into the pcb. Using a simple comparison check from the shorted together side to each leg on the other side in turn you can generally spot if one is different/open or short when compared to the others it isnt a full safe but it is a quick check and i've found a few that way . The other thing to keep an eye out for is dry joints on the connections of the trannies and the tube connectors.

http://www.lcdtvrepair.us/articles/How_to_repair_an_LCD_inverter--18    have a look at that when you've time

scooby-doo:
Cheers Jimca

Just tested the fets and you were spot on mate...One was giving me some dodgey readings out of circuit compared to the other 2 I tested...replaced with one from an old board and no more shutting down.

Thanks again

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