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Old 09-20-2019, 12:46 AM   #61
Log_on_Bob
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Default Re: Whirlpool Refrigerator LED lights flickering

Bluto

Exactly... I had to go but that was the next plan to test. Now, on the bench I did test Top light direct so 120v. tapped in 2 more lights in series. These lights say Non-dimming but they worked without any flicker. Voltage across either of those two bulbs was 53.9v so a bit less but close to what Ohms law says. That was as far as I got...

Still pretty bright, no where as bright as the single light but to my surprise, still a Daylight White. The single light is too bright to look at until it is put away fully installed in the holder, then it's fine. This should be just fine OK but what I don't know is will those two fail shortly being supplied half their rated voltage. I plan to test both ways as the diagram and all three with two in series. Since I now have 6 bulbs, if 2 burn out no biggie or if I want more light in the Freezer I can go with just the two and 120v in the freezer.

I sure didn't feel that more light is really needed low on the Refer side but we will see, I will put up some pics later.
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Old 09-22-2019, 04:10 PM   #62
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Default Re: Whirlpool Refrigerator LED lights flickering

OK, I am done for now though I might experiment later adding the lower Refer light. I choose to just go with a Top Refer and the Freezer light. I am running a test on the Bench with Two Lights in series off the Top Refer. Have about four hours run time so far, so that should be months of opening and closing the doors.

I taped the Door Switch closed. Keep in mind both doors are in series so open one turns on all. If you are not comfortable, unplug the Refer or at your own risk.

1. All four Connectors were snipped off the wires stripped back.
2. Lower two refer light wires attached together with a simple Wire Nut. This completes the circuit ( once the bulbs are in ) Top light through the Freezer and back to the Top.

3. On the Bench ( pic 1 ) I found some Insulated Female Quick Disconnects in my junk drawer. Fry's carries them or Ebay. If you only have the un-insulated then electrical tape or heat shrink tube, I wouldn't leave them open.
As mentioned, I couldn't solder direct the bulbs. Butt connector worked but these will allow you to plug a new bulb down the road easily or, Maybe an actual G9 socket MIGHT fit, I don't know.
So on the bench, the connectors were not as tight as I would like, so simply squeezing one side ( one side is all that fits ) of the connector with pliers did the trick, you want it very firm.

4. Freeze side, I just left the Female connector on the bulb while crimping the wires. These connectors happened to be 14-16 gauge, I had to extra squeeze with a large pair of pliers, pull test on the wire and I could feel it not so secure with just the crimper.

5. NOTE: Unplug or Tape the door switch ---- Top light Refer, now you have to join ( see Bluto's diagram #60 ) the two 120v wires to the other two circuit wires. This makes the Top Light 120v and very bright and the lower & Freezer in Series at half voltage, still bright.

There you go,, oh another tip, I had to use a flashlight while connecting and crimping..:-)
Attached Images
File Type: jpg Bench fitting the connectors.jpg (1.44 MB, 14 views)
File Type: jpg Both Doors open.jpg (992.9 KB, 13 views)
File Type: jpg Bench Testing.jpg (1.59 MB, 17 views)
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Old 09-22-2019, 04:15 PM   #63
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Default Re: Whirlpool Refrigerator LED lights flickering

Pic 3 Bench Testing - unfortunately you can't in the picture see much difference but there is. Full 120v is hard to look at and if you look at Pic 1 you can see all the individual LED's, at 120v you can't but in Series and Half the Voltage you can see the LED's but It's still pretty bight. About 6 hours now and they have not burned out so lower voltage may be OK. FYI - 120v Bulb gets to uncomfortable to hang onto for very long, the other two are just Warm.
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Old 09-23-2019, 12:44 PM   #64
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Default Re: Whirlpool Refrigerator LED lights flickering

Why do you need to tape the door switch closed?
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Old 09-23-2019, 03:19 PM   #65
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Default Re: Whirlpool Refrigerator LED lights flickering

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Originally Posted by Dave125 View Post
Why do you need to tape the door switch closed?
Dave

I suggest since you don't know why to tape the switch while you are working on the wiring, is to Unplug the Refer from the wall if you plan on doing this yourself.

Or do you know anyone familiar with basic wiring? I for one would like to see still around to see the new lights.

The Red/yellow wires on the Top Light Wide Plug are 120V , same as straight out of the wall socket.
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Old 09-24-2019, 07:08 AM   #66
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Default Re: Whirlpool Refrigerator LED lights flickering

That is funny, I thought you meant tape it shut permanently, not just while you were working on it
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Old 09-24-2019, 11:34 AM   #67
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Default Re: Whirlpool Refrigerator LED lights flickering

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Originally Posted by Dave125 View Post
That is funny, I thought you meant tape it shut permanently, not just while you were working on it
Excellent Dave.
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Old 11-07-2019, 03:49 AM   #68
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Default Re: Whirlpool Refrigerator LED lights flickering

Circuit may be having loose connections.
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Old 11-25-2019, 10:34 AM   #69
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Default My (rather involved) fix for Whirlpool Refrigerator LED lights flickering

Hi, the issue is not loose connections or bad LEDs but a bad power supply. Most likely a bad capacitor or other regulation which prevents the supply from starting up in a stable state. I think it's part of the "fade-in" circuitry, but the oscillator is not stably starting.

For my fridge (Whirlpool) I removed the board from the main LED unit (top of fridge) and replaced it with a small 120VAC to 12VDC power supply. Then I removed the four chip LEDs from the original board and soldered them to some perfboard, two in series, along with a 150 ohm resistor for each series. At 12VDC, this provides about the right current limiting for the desired brightness.

Photos





Then I soldered the J2 connector on and connected the 12VDC to it.

Finally, I removed the other two LED boards and did the following:

1. Cut trace between middle two LEDs as shown: (they are all connected in series; we want two sets of two in series.)

2. Remove U11 diode as shown



2. Inserted two 150 ohm resistors as shown (these can be inserted directly into the vias as shown - but be careful to solder them well, or they will cold-joint.



With these being done, the entire setup is powered by 12VDC using the existing wiring.
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Old 12-02-2019, 03:04 AM   #70
sam_sam_sam
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Default Re: My (rather involved) fix for Whirlpool Refrigerator LED lights flickering

Quote:
Originally Posted by rgriggs View Post
With these being done, the entire setup is powered by 12VDC using the existing wiring.
Very interesting way to repair these boards

Thanks for sharing this repair
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
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Old 12-02-2019, 11:54 PM   #71
redwire
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Default Re: Whirlpool Refrigerator LED lights flickering

I worry the door switches can handle the inrush currents for a larger SMPS?

It's too bad we don't have one of these boards to sketch a schematic, or know any of the semiconductor part numbers.
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