Sceptre X32

[budm]

Re: Sceptre X32

OK, check the resistance between #1 and #2 (I do not know if it is fusible resistor or jumper wire).

[thetonywarren]

Re: Sceptre X32

when I have my multimeter set on ohms for resistance my meter beeps as if it has continuity

both with power off and power on

[tom66]

Re: Sceptre X32

Fuse is OK, could be one of those red poly caps is bad, or the driver IC is not driving the bulbs. My bet would be on the red poly caps.

[thetonywarren]

Re: Sceptre X32

when I check across points1 and 2 that is.

[budm]

Re: Sceptre X32

Yes, those two caps are part of the bridge drive circuit for the inverter transformer. If you have the scope, you will need to find out if there is GATE drive signal from T2 or not.

[thetonywarren]

Re: Sceptre X32

This is going to turn into a really fun thread. Yes, I do have a scope, but I have absolutely no idea how to use it, bought an old Heathkit tube scope from a guy on craigslist, it's been sitting on my bench, but I dont even have a probe for it, let along know what knob to turn and make stuff happen. Can we go down this road, or am I asking too much? I can provide pics on the scope.

Thanks to all, this is getting fun....for me at least

[tom66]

Re: Sceptre X32

Picture of the scope - we might be able to suggest probes you can use.

[thetonywarren]

Re: Sceptre X32

before I do that, should I take both of the red caps out of circuit and test them with my esr meter? or are they different that I cant test? I have only tested electrolytic capacitors up to this point with my esr meter.

[budm]

Re: Sceptre X32

You are going to have isolation transformer to plug this power supply board into for safety, there are other ways to do it but dangerous.

[tom66]

Re: Sceptre X32

An ESR meter can't test those, but if you have an ordinary capacitance meter it probably can.

[philliesfan30m]

Re: Sceptre X32

mip320fl-t3 transformer is bad but finding a replacement is almost impossible because they don't sell just the transformer everywhere i looked. just spend the $34 and buy a mip329fl-q3 new power/inverter board. thats from china so it will take a while for shipping. what is the resistance between the 2 output pins of that transformer around 68 ohms? if you do by a new board compare the resistance of the old 1 to the new 1.

[Agent24]

Re: Sceptre X32

when I have my multimeter set on ohms for resistance my meter beeps as if it has continuity

both with power off and power on

Not sure what you mean by that but if you are testing resistance of parts in the PSU while the PSU is turned on that is a bad idea! You can damage your meter and maybe the PSU too.

[thetonywarren]

Re: Sceptre X32

sorry, I did not know that, is there a reason why?

Please let me know.

[Agent24]

Re: Sceptre X32

To test resistance, the multimeter outputs a small voltage into the test leads and across anything you connect it to for measuring. It actually measures the resulting current flow and converts that into Ohms.

If you connect it to a live circuit, high voltages\current could be applied to the meter circuitry, and cause damage.

[thetonywarren]

Re: Sceptre X32

I just ended up buying a new power supply/inverter board on ebay, the mip329fl-q3, which looks like it may have some improvements over the one that failed. FYI.

[huckster24h]

Re: Sceptre X32

Can mip320fl-q3 be used to replace mip320-2??. They look the same (same PCB). But I do not know the specs.
Thanks