Laing DDC pump repair PCB mod

[wizard1238]

After replaced the PCB of DDC 18W, the ampere increased from 1.5A to 1.8A,
the flow rate increased about 20% (using stock top)
The audible noise is also increased it should be caused by the increased rotation speed
The IC leg spacing is only 0.33mm, drag soldering is the only way
I have accidentally reverse the diode and the most expensive IC burn immediately at connecting the power
This controller TB6588FG is an all-in-one design, it has built-in overheat and restart protection, only a few external component can get it work, the original laing design is unnecessary complex.
This IC also have built-in speed control, connecting a variable resistor can adjust the rotation speed.
More information can be found in the Toshiba semiconductor website, it has datasheet and official circuit to follow.

DDC pump repair in 3 mins video guide
http://www.youtube.com/watch?v=3_Rpty4lWgg

[Church]

How it can be regulated? Can it be downvolted, and at low voltage/speed at that? Is pwm regulation possible for this controller? (who knows, maybe DIY cheap PWM MCP35X mod is possible )

[wizard1238]

no need to downvolt, the IC has a pin to control the rotation speed
the IC spec. told it can run at 50V. I will try it later to see if my DDC can run at 3X rotation speed i.e. 20000rpm

[Church]

Hheh, something like Iwaki RD pumps but in DDC housing?
What was cost of your mod? Does that controller include that PCB or it's original from pump?

[wizard1238]

the mod cost 9.95 only, it's a repair kit from the internet

[TJ TRICHEESE]

looks good, i might look into this

[SpuTnicK]

the mod cost 9.95 only, it's a repair kit from the internet

share a link please.

edit: found it

also found these two interesting lots from the same guy:
Laing DDC water pump 12W swiftech MCP350 with heatsink
Laing DDC water pump 18W blue rotor MCP355 heatsink

If the specs are true and the quality is high, then these are great alternative considering the price!

[Waterlogged]

http://cgi.ebay.com/Laing-DDC-water-...item4cf46b3d8a

[Church]

Hmm, really cheap. Should help those with fried PCBs DDCs. Only problem - required soldering skills on advanced side. And how speed regulation is actually done?

[NaeKuh]

omg u serious?

this works?

>.<

how much soldering is required?

If this is a good repair, then i can think of a lot of people who u just made super happy, as well as vendors who can sell this as well.

Hmm, really cheap. Should help those with fried PCBs DDCs. Only problem - required soldering skills on advanced side. And how speed regulation is actually done?

sell the presoldered boards for a straight drop replacement and u win even if you were to sell the pcb @ 29.99

[Waterlogged]

omg u serious?

this works?

>.<

how much soldering is required?

If this is a good repair, then i can think of a lot of people who u just made super happy, as well as vendors who can sell this as well.



sell the presoldered boards for a straight drop replacement and u win even if you were to sell the pcb @ 29.99

I have a couple of DDC-2's still hanging around that I'd buy these for but, not from overseas (or fleaBay for that matter).

[SpuTnicK]

And how speed regulation is actually done?

Based around a Toshiba PWM sensorless driver ASSP, the TB6588FG evaluation board (TB6588FG_EVB1) allows engineers to modify key parameters that adjust start-up performance, motor efficiency and acoustic noise. The board is designed for direct control by voltage input or connection to a host processor, and connects directly to the motor under test with no additional hardware components. Target applications for the new board include home appliance, pump, industrial and automotive motion control designs.

source

[Church]

Hmm, thanks for info SpuTnick. Then it seems that for 29.99 presoldered board with PWM regulation capability for reviving dead DDC pumps might indeed find it's market . A bit too expensive if working new 355 pump + board for 29.99 though, as it's already MCP35X price, with better top aswell.

[SpuTnicK]

Why $29.99? it costs $9.95? or I am missing something?

[Petra]

share a link please.

edit: found it

also found these two interesting lots from the same guy:
Laing DDC water pump 12W swiftech MCP350 with heatsink
Laing DDC water pump 18W blue rotor MCP355 heatsink

If the specs are true and the quality is high, then these are great alternative considering the price!

Very interesting... but I hate small surface mount components.... but it looks so interesting.... but I hate surface mount..... but...but... Gwaargh!!! CONFLICT!!!

Hm, wait a second... I'm sure I could mod my toaster oven to serve as a crude reflow oven.

I think I'll pick one up to play with.

[Holst]

Very interesting... but I hate small surface mount components.... but it looks so interesting.... but I hate surface mount..... but...but... Gwaargh!!! CONFLICT!!!

Hm, wait a second... I'm sure I could mod my toaster oven to serve as a crude reflow oven.

I think I'll pick one up to play with.

It will be interesting to see how you get one with this.

I would buy a kit myself but I dont have any SMD soldering kit handy at the moment.

[Church]

SpuTnicK: $29.9 was mentioned by Naekuh as good price to sell such $9.95 board/controllers but with all needed chips already presoldered as answer to my post on 'advanced soldering skills required'

[SpuTnicK]

missed that one.

[NaeKuh]

missed that one.

lol the fictional 20 dollar labor charge!



seriously i can see vendors selling this unit at 29.99 if they had it pre soldered and it being a hot item.

I myself have 2 ddc's i can easily change the PCB too, and give it a resurrection.

Now im waiting for alex to somehow drop a super charger on it... or Martin to somehow throw NOS voltages of 20V on this badboy, and we can call it a THREAD!

[Sparky]

I wanna see this running at least 36V

[Alexandr0s]

"If my calculations are correct, when this baby hits eighty-eight Volts... you're gonna see some serious . "

[Spazloy]

so hold on... ive got my MPC 355 at home, and a soldering kit handy.

are you saying if i buy this kit for 10 bucks

i can volt up my DDC so it more or less equals the power of 2 of them???

and i wont need any other components?

if i do need other components could someone make me a shopping list
im in the UK so it will take a while for it to get here but if this is correct it will save me a lot of cash

[wizard1238]

so hold on... ive got my MPC 355 at home, and a soldering kit handy.

are you saying if i buy this kit for 10 bucks

i can volt up my DDC so it more or less equals the power of 2 of them???

and i wont need any other components?

if i do need other components could someone make me a shopping list
im in the UK so it will take a while for it to get here but if this is correct it will save me a lot of cash

According to the datasheet, the Toshiba controller IC is 50V maximum. For higher than 12V operation, the power stabilization capactior 22uf and 0.1uf voltage rating need to increase. For higher than 30V operation, the Schottky Diode voltage rating need to increase as well.

[fgw]

ok folks,

could not resist! just ordered one of this kits!

its just 10usd and free shipping so who cares? was too curious.

let you know how this turns out ...

[Tetrafluorometh]

Have ordered one my self to the UK. I have someone with a reflow oven so hopefully get a good join. This DDC 3.2 i have has been dead for sometime so i will test it out fully, 20K RPM be cool