4241-tlx MLT198A power supply

[mcross]

Hello guys,
I got a ps model MLT198a with no 24 volt only get 1.82v , sb is good @ 5v and 12v i get 11.88v any ideas on the 24v?

[PlainBill]

Re: 4241-tlx MLT198A power supply

Hello guys,
I got a ps model MLT198a with no 24 volt only get 1.82v , sb is good @ 5v and 12v i get 11.88v any ideas on the 24v?

This appears to have two regulated sections of the main supply. The obvious conclusion is that one is bad. Since none of the pictures indicate which output is the 24v rail, you are on your own.

PlainBill

[tom66]

Re: 4241-tlx MLT198A power supply

These Megmeet power supplies have never been a favourite of mine.

Under the secondary heatsinks there is often a capacitor or two. Check if this capacitor is bulged.

Does the 1.82V appear immediately after switch on, or does it take a while to ramp up?

[PCBONEZ]

Re: 4241-tlx MLT198A power supply

Megmeets run flippin' hot and bake the caps dry.
The best way to start is to replace all the caps.
.

[mcross]

Re: 4241-tlx MLT198A power supply

thanks guys will do and post results

[John Conti]

Re: 4241-tlx MLT198A power supply

Needing to know the value of cap. BC3

thanks

[John Conti]

Re: 4241-tlx MLT198A power supply

Needing to know the value of cap. BC3

thanks

I found out the value (10uf 450v).

[budm]

Re: 4241-tlx MLT198A power supply

Is this the same chassis here?
http://s807.photobucket.com/albums/y...d%204241-TLXB/
I do not remember it uses 10uf 450V caps.

[xredhawk]

Re: 4241-tlx MLT198A power supply

look at back side of bc4 orange cap. might have cold solder joint

[xredhawk]

Re: 4241-tlx MLT198A power supply

i changed the cap 450v 10uf, need help figuring out how to test the other componets but tv works after heating unplug it stays off til heated again,

[budm]

Re: 4241-tlx MLT198A power supply

More likely the start up cap that got heat up for the STBY power supply. The ESR will go down so the circuit will function until the ESR goes back up when the cap cool down.
There are more caps under the heat sink that will need to be replaced also as shown in my pictures. The 10UF/450V is for the 24VDC SMPS section.
Do you have 5VSTBY? or you do not have the 24V?
The start up caps are the two on the right side of the STBY transformer, one is EC4:
http://s807.photobucket.com/user/bud...ml?sort=3&o=17

[xredhawk]

Re: 4241-tlx MLT198A power supply

Thanks bud..i really appreciate it

[kelvin28]

Re: 4241-tlx MLT198A power supply

what is the identity number for the ic on the right side of the power supply? The one i have here has its number rubbed off.

[JeffJ]

Re: 4241-tlx MLT198A power supply

OP did you ever solve your problem, i have the same issue. No 24V wondering if its worth the bother.

[hedgehorn]

Re: 4241-tlx MLT198A power supply

did you figure this one out? I have the same problem on the same power supply. Replaced all the caps still no 24v

[ReeceyBurger123]

Re: 4241-tlx MLT198A power supply

Fixed 42" Tevion same psu same fault, the fuse between the primary cap and the transistor for the 24v rail was open. Replace it and the caps and the fuse all sorted. Shame the OP was an ass and never updated us ! Hopefully I can help someone !