Daikin PCB repair or replace

[jjrbus]

RX09NMVJU FTX09NMVJU
About 4 years ago I DIY installed this unit, 2 years later the PCB board failed L5 and I had to replace it, less than $200 IIRC. The board has failed again L5 and Daikin no longer manufactures the board and now it is in the $550 to $600 range. Only 4 years old and no longer supplying parts. Not likely that I would recommend Daikin to anyone.
Is there another source of boards or is there someone that will repair the 2 failed boards I have.
Board info. 3PCB3972-11 EX13025

 

[jshillin]

https://www.ebay.com/itm/116039318808

I'd replace the board at $260. Do you have the unit on a surge protector? Not sure you should have went through 2 boards that quickly. If everything else checks, out, I'd spend $260 on the board and $50 on a surge protector for it if you don't have one already.

 

[jjrbus]

https://www.ebay.com/itm/116039318808

I'd replace the board at $260. Do you have the unit on a surge protector? Not sure you should have went through 2 boards that quickly. If everything else checks, out, I'd spend $260 on the board and $50 on a surge protector for it if you don't have one already.

For $260 I would replace the board, it is no longer available from Daikin and is available aftermarket for $550 to $600!

 

[jshillin]

For $260 I would replace the board, it is no longer available from Daikin and is available aftermarket for $550 to $600!

The eBay link I put in my response is the board for $260. Here it is again: https://www.ebay.com/itm/116039318808

 

[djbmw]

Why is it failing so often though?! Is it the same component thats failing? Maybe identify the poor quality component and replace with a better rated one.... or.. maybe there's an issue further down the line with a compressor motor or something.

 

[jjrbus]

The eBay link I put in my response is the board for $260. Here it is again: https://www.ebay.com/itm/116039318808

Thanks for the response, the board I have shows different numbers. 6026007 3F021131-13H Yes all 3 units are on surge protection.

 

[jjrbus]

Why is it failing so often though?! Is it the same component thats failing? Maybe identify the poor quality component and replace with a better rated one.... or.. maybe there's an issue further down the line with a compressor motor or something.

Thanks, I have the service manual and muddled my way through it as best I could. Then had a tech look at it and he said it is the PC board. Why is it failing is a very good question.

 

[djbmw]

Thanks, I have the service manual and muddled my way through it as best I could. Then had a tech look at it and he said it is the PC board. Why is it failing is a very good question.

If you have a magnifying glass take a look VERY carefully at the surface mount components - specifically the capacitors, for discolouration.
Next, look at any surface mount transistors and chips for burn marks. These will be VERY small and easy to miss. Use your nose as well to smell for "burnt electronics". Alternatively,.. some macro/up close pictures of each section of the board could help us identify potential areas to hone in on.

Generally, manufacturers tend to use components that "just" meet the desired specs (and some even under). For example, most dash cameras use consumer grade components, not automotive, and many cannot hold up to the vibration and thermal shock loads (extreme cold to extreme heat)... resulting in failures after 15 to 18 months.

 

[jjrbus]

If you have a magnifying glass take a look VERY carefully at the surface mount components - specifically the capacitors, for discolouration.
Next, look at any surface mount transistors and chips for burn marks. These will be VERY small and easy to miss. Use your nose as well to smell for "burnt electronics". Alternatively,.. some macro/up close pictures of each section of the board could help us identify potential areas to hone in on.

Generally, manufacturers tend to use components that "just" meet the desired specs (and some even under). For example, most dash cameras use consumer grade components, not automotive, and many cannot hold up to the vibration and thermal shock loads (extreme cold to extreme heat)... resulting in failures after 15 to 18 months.

I looked it over with a magnifying glass and see nothing amiss, thanks.

 

[PoorUB]

Why is it failing so often though?! Is it the same component thats failing? Maybe identify the poor quality component and replace with a better rated one.... or.. maybe there's an issue further down the line with a compressor motor or something.

Thanks, I have the service manual and muddled my way through it as best I could. Then had a tech look at it and he said it is the PC board. Why is it failing is a very good question.

What does the board control? I have seen circuit boards fail because the blower motor it controlled was apparently running fine, but was puling a few more amps than it was supposed too. Replaced the board and motor and the ran for years.

 

[jjrbus]

Heard from tech I had here, he said the original board has been superseded and the replacement board is not available so will have to be manufactured.

 

[tyromeo55]

That eBay listing from post 2 is shipped from China, shows 10-35 working days lead-time and the seller has some poor feedback.

Dankin PCB repair gets a lot of google hits. maybe they are crummy at making them? Here is a video of one that looks similar. Not the easiest to follow but maybe helpful?