Inrush limiting thermistor. Almost any ~10A capable device will be fine to replace it. It's quite likely that the NTC acted as a fuse there and isn't the cause of the fault - I suspect a controller IC somewhere has been "wounded" and is malfunctioning.
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Inrush limiting thermistor. Almost any ~10A capable device will be fine to replace it. It's quite likely that the NTC acted as a fuse there and isn't the cause of the fault - I suspect a controller IC somewhere has been "wounded" and is malfunctioning.
Ok now to find the malfunctioning IC. Am I going to need an oscilloscope?
Ok now to find the malfunctioning IC. Am I going to need an oscilloscope?
I'd say only the IC attached to the PFC FET you replaced needs replacing.
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Its in the correct area. Looking at the original photo I didn't see it had cracked. Oh well that's an easy fix. Still think I need to replace the IC? (as much as i love surface mount soldering)
By it's position, I'm guessing it would be better replaced by a UF4007 because it's going to be involved in the switching part and needs to be fast. 1N4007's are really slow parts - fine for rectifying mains but not much more!
I'm not certain about the IC.
When you replaced the fet...
1.) what replacement did you use?
2.) did you re-apply thermal paste?
3.) did the TV display anything sensible?
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When you replaced the fet...
1.) what replacement did you use?
2.) did you re-apply thermal paste?
3.) did the TV display anything sensible?
1) I sourced the same fet.
2) The Fet didn't have thermal paste, just thermal pad.
3) The tv displayed static, but I did not have an antenna in. I presume it was on analog input.
I am also struggling to find a suitable replacement thermistor. I'm looking at www.jaycar.com.au (the only shop open today).
Cant find a 10A thermistor. Is a lower amp just going to blow again?
Last edited by nickdablack; 05-19-2012, 05:17 PM.
Reason: extra info.
Ah, okay - hmm. Strange that it would just blow like that.
As a precaution, it may be a good idea to replace the 450V capacitors on the primary as it has been seen that these can kill the PFC fets if they go bad. (Maybe the burn mark did more than damage the label of the cap.)
For the NTC... you might be able to use a 3-5 amp device as this unit would probably pull less from a 240V AC input.
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Thought I would be thorough before firing it up again. found a short across pins 1 and 3 of DP802. I wish I saw that before I ordered parts. Oh well off shopping I go again.
Thought I would be thorough before firing it up again. found a short across pins 1 and 3 of DP802. I wish I saw that before I ordered parts. Oh well off shopping I go again.
Where is DP802 on the PSU? Seems like that FET took out a few other things with it.
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