Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

I insulated the 2 wires (brown and blue) and power up without the overload protector just to confirm if the circuitry is working - and compressor not starting up as expected.

Then I put everything back per normal, power up and rerun the Self Diagnostic one more time (which I have done multiple times), and paid really close attention to the indicator displays at the door panel - OMG!

2 of the indicator lights blinked a few times then went off. I waited for a minute or so, nothing happened and all the indicator display lights were off. I have done this a few times and it always the same outcome.

I was thinking since the outcome is nothing lighted up - so the fault should be the at the end of the flowchart:
• Faulty compressor motor.
• Compressor lock.

Now, looks like it is at #4:
• Defect of control PCB.
• Communication error between IC1 & IC201

So I guess I just have to source for a working controller board!

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

so it is really 0.2 ohms which seems good

have you tried fast freeze yet ? it should bypass the thermostat .

You meant the Fast Freeze button on the fridge? Yes, it has no effect on the evaporator.

I should clarify, that the fridge is always power down. Each time I did some checks, or taking measurements, I would power it up for like 5- 10 minutes, then I will power down the fridge.

The longest I have left it power up is ~30 minutes, and still no cool air at all..

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

the + end of the bridge rectifier is darker, marker pen, soot, burn mark??

I think it's shadow from the camera phone. This pics is clearer, look normal.

[petehall347]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Weird.. Now it reads 0.7 ohm, and touching the 2 leads together reads 0.5 ohm.

so it is really 0.2 ohms which seems good

have you tried fast freeze yet ? it should bypass the thermostat .

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

the + end of the bridge rectifier is darker, marker pen, soot, burn mark??

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Weird.. Now it reads 0.7 ohm, and touching the 2 leads together reads 0.5 ohm.

[petehall347]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

try putting your meter leads together then deduct the reading from 3.2 .
have you tried fast freeze function ?

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

that thermal looks broken ...

If it tested resistance of 3.2 ohms across pin 1 & 3, does it mean still good? If not, how to determine it's still functional?

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Check the resistance between pins 1 & 3, it should check like a short. It trips with excess current not voltage.

The resistance between pins 1 & 3 is 3.2 ohms.

Noted your correction, important for my education, thank you.

Presumably, if the compressor draws too high current, the temperature rises above the limit and trips open this protector, and cut off the power to all 3 terminals of the compressor?

In my case, the voltage among all 3 terminals were 160VAC soon after powered up, does this mean the compressor is not overloaded?

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

i suspect the motor may have a bad phase or drive line,
if it hums then the electronics are trying to run it.
we need board pics.

Here are the controller board pics, and connectors diagram.

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Could you put this original picture somewhere so I can make some tests with it?
(Obviously you would need to use some other website if you get the error above here...)

Here's the link for 1 such pic that caused this error: https://we.tl/t-lLIq3zXP41

** I just did a resized from 15mb to 4mb, then it loads OK.

[R_J]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

On the overload protector - how do I determine if it tripped open due to over-voltage or not?

Check the resistance between pins 1 & 3, it should check like a short. It trips with excess current not voltage.

[petehall347]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Based on this sensor specs, I believe the 2 sensors I tested measuring at 1.58kOhm at ~26-28c, and 5.8kOhm at 0c should be working normally.

On the overload protector - how do I determine if it tripped open due to over-voltage or not?

that thermal looks broken ...

[RJARRRPCGP]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Could you put this original picture somewhere so I can make some tests with it?
(Obviously you would need to use some other website if you get the error above here...)

Was it really bigger than 128 MiB?! WTF!

It looked like I calculated the bytes-to-megabytes correctly.

Normally, this would look like a server-end problem.

[Per Hansson]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

*for some reasons, I frequently get this error when uploading pics:

Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 27000001 bytes) in /home/badcaps/public_html/forum/includes/class_image.php on line 2390

Any idea why this is happening?

Could you put this original picture somewhere so I can make some tests with it?
(Obviously you would need to use some other website if you get the error above here...)

[stj]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

i suspect the motor may have a bad phase or drive line,
if it hums then the electronics are trying to run it.
we need board pics.

[RJARRRPCGP]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

I believe this is due to the file size too big. My phone pics are 3-4mb and I had to do a simple screen capture to reduce the size, and it works.

For me, it looks like I can upload the original photos from my phone and they end up getting downsized automatically instead of an error. Why is that? Are mine still smaller, even when quality very high?

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

Based on this sensor specs, I believe the 2 sensors I tested measuring at 1.58kOhm at ~26-28c, and 5.8kOhm at 0c should be working normally.

On the overload protector - how do I determine if it tripped open due to over-voltage or not?

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

That's strange, I've had no problems uploading images during the last time I uploaded photos.

I think it's because they are being shrunk for me...

I believe this is due to the file size too big. My phone pics are 3-4mb and I had to do a simple screen capture to reduce the size, and it works.

[beetle1303]

Re: Panasonic Inverter Refrigerator model NR-BY602XS - suddenly not cold overnight

"When probed at the cable connector, it measure 1.58k ohm, but when power up and probed at the connector pluck back onto the controller board, it measured 0 ohm, ~2VDC.. "
You do not perform resistance reading when the circuit is powered, you can easily damage your meter. Please read your meter user manual.

Noted, and thank you. I am learning as I do not have prior training or experience.