Re: Vintec V160SGB wine chiller - thermostat replacement
Yes, I read in details and gotten a much thorough understanding now. With some confidence, I bought one from Aliexpress for a fraction of original Danfoss part costs. I hope it would be a simple "plug and play", otherwise would fiddle with the fine-tuning per the descriptions.
*note the existing part probe length is around 200cm, so a bit harder to find the right part - this is 195cm, the longest I found.
As a backup, I also bought a digital one, and this is a sure thing since...
beetle1303
Badcaps Veteran
Last Activity: 11-09-2023, 07:58 PM
Joined: 07-15-2019
Location: Singapore
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Re: Vintec V160SGB wine chiller - thermostat replacement
I found this link too - but it's longer available.
I don't understand the mechanical thermostat specs and therefore having difficulty picking an equivalent part. There are many in Aliexpress, but they are labelled WDF-XX or WPF-XX, etc which I do not know what they mean..
Do you, or anyone here know?...Leave a comment:
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Re: Vintec V160SGB wine chiller - thermostat replacement
I have done a mechanical to digital thermostat replacement before. The usual setting is the set the cut-out temperature say, at 12C, and set the cut-in temperature at few degree higher, say at 15C. Then the cycle would be +/- 3C, usually take around 15-30 minutes depending on embient temperature.
Thanks - I google and found a few exact part in ebay. They are expensive as is, and adding shipping cost to Singapore would be too expensive for me.....Leave a comment:
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Vintec V160SGB wine chiller - thermostat replacement
My vintage wine chiller, Vintec model# S160SGB, mechanical thermostat failed (not cutting off compressor at set temperature anymore).
After some initial research, this is a Dasfoss 25T65 EN 60730-2 part number.
While this part is generally still available in some online portal, it is fairly expensive. There are many digital thermostat available with some simple rewiring, but I am hoping to preserve it with a with a less expensive mechanical equivalent part.
Anyone familiar can recommend some less expensive equivalent?... -
Re: Wine Chiller - SMPS issue - fluctuating voltages
AP8269 pwm ic finally arrived after 2 weeks. Not very good at SMD component replacement, but managed to get it working after 2 tries.
Tested bare board - working!!! No more fluctuating voltages at both primary and secondary sides.
Installed beck to the chiller - fully functional with fans and lights, and chill to set temperatures much faster.
Here' the summary of this project:
1) Original fluctuating voltages must be due to 1 or more of the electrolytic capacitors bad/weak...Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
I am now very optimistic with your confidence, knowing that all the capacitors are now replaced. Thank you....Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
Yes, I have ordered 5pcs of AP8269, anticipating damages on for couple of attempts..
So yes, will follow the input and do test cases depending on the outcome of this IC replacement....Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
It is the reflection of camera light. To be sure I just tested with DMM and there's no short.
This chiller has dual zone. In its original operating condition:
- 5V supply to both zone control panel are good, but light button is not functional, and internal fans are not spinning either.
- Lights and Fans are all connected to 12v sockets on this board.
I am not knowledgeable about fluctuating voltages is the reason lights and fans are not functioning. Guess now it's no...Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
Noted - eagerly waiting for online purchase delivery....Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
A small price for ignorance, but a very valuable knowledge gained! Now it clearly explained why pulling out all other components changes nothing, until this unfortunate SBD20C...
Hmm... after restoring R13, and eventually a new AP8269 IC, I would most likely be back to square one then - a fluctuating voltages on the secondary side?...Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
Thank you for these information, it super helpful for my education.
And for my further education:
1) B+ and Drain both read 329v from the bridge rectifier. If the IC is working, how does the feedback winding gets its 16v?
2) Vin must be 30v: but the only feed I see is from B+ through R17 & R18, and reads 3.6v, is the 30v generated internally to get started?
In fact, I would extremely thankful if you could briefly describe the sequence of events leading to the startup and normal...Last edited by beetle1303; 09-08-2023, 10:16 PM.Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
I am curious about this primary side of transformer pin - +329V from bridge rectifier to middle 2 pins, and -ve to ground pin on the right.
The left most pin has 0V - is this correct, and why if this is so?...Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
My joy was short-lived unfortunately...
After soldered in a 22ohm resister, powered up - still exactly the same status: there is still 3.6v input to Pin #3 Vin, but still no voltage output at Pin#7 Vcc, and the CD7 capacitor still 0v...
Looks like PWM IC still not switching, probably dead..., and I've just placed online order the this replacement IC.
If anyone has any clue to possibility of secondary side shorted somewhere, I would be pleased to investigate fully....Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
R17 and R18 are good at ~2.2Mohm and 0.6Mohm. As stated in previous post, R13 is open and thus capacitor not changed up to feed Vcc externally....Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
Arha!!
After taken off the transformer, traced the diode and resistor and capacitor circuit to Vcc, found the culprit - R13 resistor is OPENED!!
*I don't have a SMD 220 resistor, plan to salvage a through hole 22ohm resistor from some power board on hand later.
Thank you very much @STJ...Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
I was reading up further on a few causes on SMPS no output voltage on secondary side:
1) Faulty PWM IC
2) Fault power mosfet
3) short-circuit somewhere Son secondary side
4) Faulty opto-coupler
5) Faulty capacitors (which I have replaced all)
etc.
I pulled out the power mosfet, SVF12N65F, and did all permutation with DMM reading, and not sure if it help anyone to help me further:
Basically, measure all combinations of the 3 pins, in- and off-circuit. The results...Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
Pin3 Vin: 3.5V
Pin7 Vcc: 0v - the diode and resistor in series to the capacitor feeding Pin also tested ok.
Also,
Pin2 CMP: 0V - there is no voltages on either side of the opto-coupler either. They were fluctuating voltages before, but now 0v since the re-insertion of the Schottky Rectifier in previous post.
* that rectifier test working in- and off-circuit though..
Also, power mosfet Drain-Source reads 335Vdc, same voltage as bridge rectifier output, indicating pwm ic...Last edited by beetle1303; 09-06-2023, 10:28 AM.Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
No.. this SMPS for everything - it has stable 2x 5V to each of the zone control panel for power-on, temperature setting, display, compressor relay, etc. And a bunch of 12V connectors for fans and lighting which with fluctuating voltages.
I was pulling out one component at a time to see which one could be the cause if the fluctuation and all seems the be ok as the fluctuation continues. Until I pulled out and in-inserted the SBD20C 150F Schottky Rectifier at the secondary winding side , then no output...Last edited by beetle1303; 09-06-2023, 08:01 AM.Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
Wine chiller actually working, and cut in and out the compressor when reaches set temperature. The 2 sides the the exterior walls were very hot, and I suspected fans are not running since the light also cannot be turn on..
I think the capacitors are all shielded from condensation/moisture probably, because this control board is mount upside-down inside the chiller compartment, with a non-airtight cover....Leave a comment:
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Re: Wine Chiller - SMPS issue - fluctuating voltages
I have purchased the set of 7 capacitors and replaced all of them. Outcome is still the same - no voltage output on the secondary side, while the primary side filter capacitors has 335Vdc to the transformer. The CD7 capacitor to the PWM IC is still no voltage.
Seems like PWM IC is not powered up, and therefore not switching?Leave a comment:
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