dehumidifier suddenly won't power on

Question

Dehumidifier

Information and repair guides for dehumidifier repair, an appliance that removes humidity from the air in your home.

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Carl @pawcharles

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crwdns2931729:0crwdne2931729:0: Maw 26, 2022

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dehumidifier suddenly won't power on

LG dehumidifier working great then suddenly died. Power source is ok but pressing power does nothing. no sound no display, simply no response from the unit. Could bad capacitor be the culprit?

The bigger problem is that the capacitor in question has been discontinued and no longer available. Label printed on the capacitor: CBB65A-1 35uF +/-5% 50-60Hz 270VAC 3.0/3.6A 25/80/21 C.PI SH CQC02002001190 Protected 10\1000 AFC Plant Oil EN60252). I'm a DIY and have no experience on this stuff but I can follow wiring diagrams. I just wanted to see if it’s just the capacitor and I'm willing to buy a compatible capacitor that (one close to the specs shown) and see if I can resurrect the unit. Beyond this initial attempt, it will be too much for me to figure out and will probably just ditch the unit. Any assistance will be much appreciated. Thank you all.

Haven't done much on the capacitor other than disconnect from the wirings. It looks ok (no dents, no bulges, except for faint sign of what could be a leak near the foot of one of the prong terminal.

Hi. Thank you so much for the follow-up troubleshooting guidance. I may have found the potential problem. The 13-pin cable connecting the main pcb to the display pcb appears broken (see pic). I tried to do a quick search and this cable may not be sold separately from the main board rather as a board-cable bundle. i will keep on looking. If you know of a possible cable source please let me know. Again thank you for all the assistance.

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Hi @pawcharles

What is the model number of the dehumidifier?

crwdns2934271:0Maw 26, 2022crwdnd2934271:0 jayeff crwdne2934271:0

@jayeff it's an LG model LHD45ELY7

crwdns2934271:0Maw 26, 2022crwdnd2934271:0 Carl crwdne2934271:0

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jayeff @jayeff

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crwdns2931729:0crwdne2931729:0: Maw 26, 2022

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Hi @pawcharles

Here's the service manual that should help.

It shows that the capacitor part number is 0CZZA2005J but I cannot find one using the part number or even one that has the same overall specifications.

Any CBB65 motor start/run capacitor with a value of 35µF and having a VW >270VAC should suffice.

Looking at the schematic (see p.9 of manual) no display, no response etc is not indicative of a bad capacitor, as the capacitor is essentially only in the compressor motor start winding circuit to help start the motor i.e. both windings are used to start the motor. Once the motor runs up to speed a centrifugal switch in the motor operates and disconnects the start winding and capacitor and it continues to run on the run winding only. The switch releases once the motor has stopped so that the start winding is back in circuit for the next start.

Hopefully this is of some help

Hi @pawcharles

I've drawn a rough outline on the schematic showing what to test.

If it were assembled then you would connect the Ohmmeter across the two prong of the AC cord plug and you should see a resistance value which is the low volts transformer on the control board. On the schematic image it is the green path that then connects to the red path.

Since it is disassembled first check the path from where the brown wire connects on connector CN-AC1 to where it exits the board wherever the black wire connects to. This path is shown in red. If you place the Ohmmeter between these two points (arrowed in red) you should see the resistance of the LV transformer primary winding. If you don't then there's a problem on the board or the transformer and you will have to chase the path on the board by visually following the tracks/connections. Maybe connect directly across the LV transformer itself first. It has two windings, a primary (which you are testing for) and a secondary which you may have to test later on). Both windings should show continuity and not open circuit. i don't know what their resistance value would be but it shouldn't be that high <500 Ohms I would think.

If that path is OK then check the secondary winding of the LV transformer i.e. measure directly across the terminals of the transformer. This is just in case when you connect power it is getting to and through the primary OK but there is no output because the secondary is open circuit

Next check the path from the AC input white wire (or maybe blue) to the capacitor term.C to the brown wire that connects to CN-AC1 on the board. Then check the other wire i.e. black (or maybe brown) from the AC input to where it connects to the control board. This is shown in green on the diagram.

(click on image to enlarge)

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Hi. Thank you so much for the link to the manual and the elaborate and very clear response. I will check the board and see if the fuse is indeed blown. I will provide an update on what I found out. Appreciate the prompt assistance.

crwdns2934271:0Maw 27, 2022crwdnd2934271:0 Carl crwdne2934271:0

Hi. I checked the fuse and it was ok. So back to the Capacitor issue. I have a multimeter but it doesn't have capacitance measurement. I used the resistance to check if capacitor is good or bad. What I see is the resistance slowly and constantly building up to infinity which from my research indicates a good capacitor. So I guess this is really the end of this dehumidifier unless you have other suggestions. Thanks again.

crwdns2934271:0Maw 28, 2022crwdnd2934271:0 Carl crwdne2934271:0

@pawcharles

With the power disconnected from the humidifier, measure between the two AC input terminals or even the 2 prongs (Active and Neutral) on the plug of the power cord and you should have continuity through the LV transformer on the control board.

If there is then the problem is on the control board. Maybe measure the secondary winding of the LV transformer for continuity and it that is OK then the power should be on the board. After that you may have to check for faulty components on the board.

If in any doubt about a component etc post an image of the board in your QUESTION. Here's how Adding images to an existing question

crwdns2934271:0Maw 28, 2022crwdnd2934271:0 jayeff crwdne2934271:0

btw, i found a similar capacitor at Amazon (QH QX6535-NGM 35uf Capacitor Motor Run Round 35 uF MFD 370V HVAC) (https://www.amazon.com/QH-QX6535-Capacit...).

Based on your response above this should work. For $10 I might just bite the bullet and see if it works. Would you think this is a wise move or recommend a different step? Thank you again.

crwdns2934271:0Maw 28, 2022crwdnd2934271:0 Carl crwdne2934271:0

@pawcharles

I was updating my comment when you just answered so check what I'v suggested that you try first before that.

As I said, the capacitor is only for the compressor and is not related to whether the control panel lights up or not

crwdns2934271:0Maw 28, 2022crwdnd2934271:0 jayeff crwdne2934271:0

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Hi @pawcharles

What is the model number of the dehumidifier? — jayeff
Hi. Thank you so much for the link to the manual and the elaborate and very clear response. I will check the board and see if the fuse is indeed blown. I will provide an update on what I found out. Appreciate the prompt assistance. — Carl
Hi. I checked the fuse and it was ok. So back to the Capacitor issue. I have a multimeter but it doesn't have capacitance measurement. I used the resistance to check if capacitor is good or bad. What I see is the resistance slowly and constantly building up to infinity which from my research indicates a good capacitor. So I guess this is really the end of this dehumidifier unless you have other suggestions. Thanks again. — Carl
@pawcharles

With the power disconnected from the humidifier, measure between the two AC input terminals or even the 2 prongs (Active and Neutral) on the plug of the power cord and you should have continuity through the LV transformer on the control board.

If there is then the problem is on the control board. Maybe measure the secondary winding of the LV transformer for continuity and it that is OK then the power should be on the board. After that you may have to check for faulty components on the board.

If in any doubt about a component etc post an image of the board in your QUESTION. Here's how Adding images to an existing question — jayeff
btw, i found a similar capacitor at Amazon (QH QX6535-NGM 35uf Capacitor Motor Run Round 35 uF MFD 370V HVAC) (https://www.amazon.com/QH-QX6535-Capacit...).

Based on your response above this should work. For $10 I might just bite the bullet and see if it works. Would you think this is a wise move or recommend a different step? Thank you again. — Carl
@pawcharles

I was updating my comment when you just answered so check what I'v suggested that you try first before that.

As I said, the capacitor is only for the compressor and is not related to whether the control panel lights up or not — jayeff