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| LG Dehumidifier LHD65EBL | Rating: 
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| Posted: Fri May 22nd, 2009 12:11 am |
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1st Post |
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Tim M Scholar of Advanced Appliantological Studies 
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. Posted this yesterday in the Enrolled Student's Classroom. Hoping I might somehow get a response here. I have to check again, but it seems 120V is getting into the transformer, but only 3V of 13V is getting out. Here is the original post: . Wow. I don't know how he managed to plug a dehumidifier into a 220V outlet, I guess there was some kind of weird foreign adapter. Now the thing is totally dead. The cutesy display doesn't even light up. Checked the 15A fuse, Ohms at 0.2 Not quite sure where to check next. Transformer, capacitor? I don't know why you need a printed circuit board and digital display on humidifier that sits in one's basement...
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| Posted: Fri May 22nd, 2009 03:04 am |
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2nd Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology 
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Disconnect the output of the Transformer and measure the AC output voltage ... You may have blow the built-in Fuse that some Transformers have. That may not have saved any electronic controller, etc... just prevents fires... Check the terminals to where the Transformer (disconnected) output goes to, to see if it's shorted.
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Sat May 23rd, 2009 02:30 am |
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3rd Post |
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Tim M Scholar of Advanced Appliantological Studies
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Here is the schematic. Attachment: dehumidifier schematic.pdf (Downloaded 8 times)
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| Posted: Sat May 23rd, 2009 02:38 am |
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4th Post |
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Tim M Scholar of Advanced Appliantological Studies
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And here is the part. http://www.repairclinic.com/SSPartDetail.aspx?s=t-6871A20888C-%3d%3di1359563&PartID=1359563 Now with only wires going into the bottom left corner, 2nd tab above the screw and the two onto the black box to the right of the fuse. I measured what is going into that black box: 120V. Then I measured what comes out of the base of the transformer: 2.55V. I got this off the legs coming out of it above the circuit board. Check the terminals to where the Transformer (disconnected) output goes to, to see if it's shorted. I can't disconnect the transformer without desoldering. But without anything else connected I hope I am doing OK. Tim Attachment: 00360170.jpg (Downloaded 49 times)
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| Posted: Sat May 23rd, 2009 09:33 am |
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5th Post |
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Samurai Appliance Repair Man Fermented Grand Master of Appliantology 
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Tim M wrote:
If you're sure that voltage measurement on the output of the transformer, then it looks like you need to replace that control board module (bad transformer).
____________________ To ask a question, use our new forums==> http://appliantology.org 365-Day No-Hassle Return Policy on all parts purchased through this site, even electrical parts that have been installed! |
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| Posted: Sat May 23rd, 2009 02:13 pm |
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6th Post |
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Tim M Scholar of Advanced Appliantological Studies
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That's what I was thinking. On the other hand, what are the chances it's blown the control panel, the capacitor, any relays, the motor. I guess I could get a new main circuit board which would cover everything on that. I can buy it for $65 from a place I can return it, or $31 from one I can't. Little bit of a crap shoot. Any advice on whether other pieces might be blown???? Thanks all.
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| Posted: Sat May 23rd, 2009 02:16 pm |
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7th Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology
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If you remove the Transformer, and can determine what output voltage it had... you could possibly try a small replacement transformer to see if the device powers-up ..
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Sat May 23rd, 2009 03:06 pm |
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8th Post |
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Tim M Scholar of Advanced Appliantological Studies
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Hmmmm... I could, but it sounds like I'm stuck on knowing or even guessing if something else is wrong until the board or transformer is replaced. Unless someone happens to have experience with power surges and has a good guess on this. An electrical engineer from the Caribbean says he sees a lot of power surges and suggests it's not even worthwhile to mess around with this. I guess I can get the board and try. If no one else is screaming "Noooooo! Don't do it!" I'll go ahead and order the board. Wondering too if I should order anything else at the same time. Control panel for instance. Again, I know anyone who has advice on this would probably have to have seen this sort of situation before. My doorbell transformer might put out 13V, but I don't think I'll mess around with that... Tim
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| Posted: Sat May 23rd, 2009 04:40 pm |
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9th Post |
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Samurai Appliance Repair Man Fermented Grand Master of Appliantology
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Look on the compressor nameplate-- it's it's a 120vac motor, then the transformer output has to be 120vac because the transformer supplies the compressor.
____________________ To ask a question, use our new forums==> http://appliantology.org 365-Day No-Hassle Return Policy on all parts purchased through this site, even electrical parts that have been installed! |
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| Posted: Sat May 23rd, 2009 05:14 pm |
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10th Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology
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I don't think the output of that Transformer powers the Compressor... I think the primary side of the Transformer is connected to the Compressor ... The output powers the Display & Controller ..
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Sun May 24th, 2009 12:20 am |
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11th Post |
Bobice
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The transformer is as Reggie says for the control side. Why not test the suspected parts with an ohmmeter ? Use the doorbell transformer to supply the low voltage, but my guess is it is fried.
____________________ Retired US Army Refrigeration Specialist / NYC Board of Education HVAC/R (Retired) 40 Years HVAC/R service, sales,installations. a tragedy has happen to me : http://web.me.com/zenzoidman/Bobice/ |
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| Posted: Sun May 24th, 2009 01:13 am |
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12th Post |
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Samurai Appliance Repair Man Fermented Grand Master of Appliantology
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RegUS_PatOff wrote: I don't think the output of that Transformer powers the Compressor... That's what I meant to say. Eh heh. 
____________________ To ask a question, use our new forums==> http://appliantology.org 365-Day No-Hassle Return Policy on all parts purchased through this site, even electrical parts that have been installed! |
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| Posted: Thu May 28th, 2009 01:04 am |
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13th Post |
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Tim M Scholar of Advanced Appliantological Studies
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Yeah, I know the transformer is fried, I just don't know what else is fried and I don't know my way around printed circuit boards well enough to tell. The main pcb gets replaced with the transformer, but I've still got the control pcb and every other part that is not on the pcbs. Given my shortcomings, do I get the main pcb with transformer only, or get the display assembly pcb as well, just in case? Last edited on Thu May 28th, 2009 01:33 am by Tim M |
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| Posted: Thu May 28th, 2009 10:16 am |
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14th Post |
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Budget Appliance Repair Fellow, Academy of Sublime Masters of Appliantology
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There is a very good chance that only that main control board has been fried. The transformer is the first thing the 220volts hit and doesn't really feed to anything else until the user inputs desired control functions/power on at user interface board. Since the transformer can't handle 220volt it pretty much fries out in an instant before user ever has a chance to try to input any "Power ON" controls, so display LED should not have been hit with any high voltage.
____________________ William Burk (Willie) Willie's Budget Appliance Repair Eureka, CA 95501 |
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| Posted: Thu May 28th, 2009 12:22 pm |
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15th Post |
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Tim M Scholar of Advanced Appliantological Studies
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Wow you get up early! That's what I was hoping, that nothing could even get turned on before it was fried. That gives me some peace of mind. I'll let you know how it turns out.
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| Posted: Sun Jun 7th, 2009 09:50 pm |
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16th Post |
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Tim M Scholar of Advanced Appliantological Studies
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Well that was it! And it looks like the transformer did blow out before it had a chance to blow out the display/control printed circuit board or anything else. I had known the main circuit board, or at least the transformer on it was gone, and it was worth it to have another opinion that said that was probably as far as it went. And so… $10 to the Beer Fund. Due to the extended vacation of Live Help, I am wondering if the Repair Forum is having a cash generating problem, or people who visit this forum are reluctant to pay for correct answers because they can get wrong answers cheaper from other web sites and then buy hundreds of dollars in parts they don't need. So what's going on?
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