Fruit Trader

15 hours ago, JHolmesJr said:

Oooof...Hated this new season. Its run its course for me.

Stick with it for a few more episodes.

Missing a few lobes, Brady Hartsfield's brain has been kept alive for research so there's a good chance of some action direct from the lab jar.

A few cash miles left so AT&T will scrape the barrel dry with this one.

7 minutes ago, eyecatcher said:

Hahaha, the picture implies 6m3 of concrete was accidentally spilled in the bathroom.

Now I know why the Americans call it a dumptruck

You need lots of imagination with package labels here.

SPA CLEAN is an excellent stain removing cocktail though. We use it on the product washer where all kinds of deposits quickly build up.

I also have my own recipe but you need to control the application time before it starts eating everything.

SPA CLEAN 
Stain cleaner

Nihon SANADA CC Opening Nakamae (FCC) C-1264
Kokuchijou. 4984324012641
Strong acid group, surfactant, organic acid.
 

4 minutes ago, Crossy said:

 

But that's not the board in question is it?

 

The board in the OP photos is single-sided (wire links on the top surface) and it's SRBP, it's not even an FR4 board (cheap, cheap cheap).

 

AliExpress or Ebay is certainly worth a look (I didn't see any with a quick search).

Yes its a 080310-05658 bottom side. Look near the white 3 pin power connector and follow up to the transformer then to the isolation slots.

On 9/5/2019 at 4:30 PM, Crossy said:

It looks like a simple through-hole board, not really much to go wrong, could even just be the fuse.

They looks like simple through hole boards until you flip them over. The through hole is mostly power supply switching and external control. Not difficult to to test the power supply and repair but this often reveals a damaged processor if the board was hit by a spike.

Aliexpress often has second hand discontinued board for sale and worth a part number search.

The B side.

51 minutes ago, Naam said:

what part of

is it you didn't understand? are you trying to tell me 

 

but Samsung Headquarters Thailand located in Bangkok has no access to qualified service engineers?

 

yawnnnn...

But but the subject is AC's not Samsung TV's. You made the usual TV style sweeping statement 'AC inverter boards are difficult to repair' when often they are not. I corrected it and you threw your teddy.  Another topic drifter ... yawn.

On 8/30/2019 at 9:05 PM, Naam said:

posted March 9, 2009

in january 2006 i bought a Samsung 67" LDP TV and 139,000 Baht and in august the same year Mrs Naam bought the same model for "only" 118,000 Baht. a few weeks ago my TV conked off, not completely but intermittendly on/off on/off on/off. so i confiscated the TV from the Mrs and threw the ball in her lap.

 

"engineers" from Numchai, Pattaya concluded "motherboard gone" and took the unit for repair. a few days later we were told that it will take at least one month as the part has to be ordered in Korea, total cost something like 29,000 Baht more than one month passed and after enquiring we were told by Samsung Service Center, Pattaya "solly, lepair no can do". we asked "vhat ze eff does zat mean?" and "vhat shall vee do now?"

 

Samsung, BKK got involved, called me today and i understood that due to the fact that the TV is more than three years old we can respect a refund of 33%. today it turned out that Samsung is offering cash "new price LESS 33%" which i think is a very fair settlement. by the way, LDP models are not produced anymore because Samsung had obviously too many problems with that rather unique but excellent system. i do hope that the confiscated TV will last some more years as Mrs Naam will buy a Plasma or an LCD for herself 

I guess you are trying to question the 'easy repair' of AC inverter by comparing with a 2009 TV repair and your experience with Pattaya electronic repair engineers.

Very few electronics repair engineers in the Chonburi province specialise in power electronics. There are many in Bangkok.

The power electronics of inverter boards have common configurations where decent test gear makes fault location quite straightforward. If a processor is alive we can usually scope its IO and peripheral circuits using basic data sheets. The repair engineer will quickly become familiar with manufacturers design after repeat repairs on similar boards.

7 minutes ago, bankruatsteve said:

I don't know what question you are answering, but it isn't for the one I asked.  ???

Here is you question :-

One thing I don't get is the BTU rating for aircons.  10K BTU corresponds to about 2900 watts (according to the calculators).  But, neither my standard AC nor my inverter AC come even close to drawing the rating in watts.  Eg:  my 11K BTU inverter on "Power cool" only draws about 1000 watts.  What's the deal?

I have answered your question.

7 minutes ago, bankruatsteve said:

My question was why AC rated at 10K BTU only consumes at most 1kW (for one hour).

BTU/h

Read this

https://en.wikipedia.org/wiki/British_thermal_unit

Just now, bankruatsteve said:

Whatever.  10K BTU/hr = 2,930.7107 watts.  The question remains the same.

You answered the question its a simple energy calculation.

BTU is the energy required to heat or cool 1 pound of water .....

13 minutes ago, bankruatsteve said:

One thing I don't get is the BTU rating for aircons.  10K BTU corresponds to about 2900 watts (according to the calculators).  But, neither my standard AC nor my inverter AC come even close to drawing the rating in watts.  Eg:  my 11K BTU inverter on "Power cool" only draws about 1000 watts.  What's the deal?

The conversion is BTU/hr - Watts

2 hours ago, Naam said:

electronic modules/motherboards are extremely difficult to fix. usually the whole module is replaced. and both "difficult to fix and replace" applies to the motherboards of conventional units too. the only difference is that they are considerably cheaper.

The power electronics and their driver stages are easy to repair but processor faults will normally scrap the board due to custom components or control software. A while back I setup up a family member repairing industrial power electronics. This has now extended to a steady flow of domestic AC, refrigerator and pump inverter boards. 

1 hour ago, Crossy said:

At present it's just a thought experiment, our daytime loading is pretty constant so I could reasonably easily set up a system that won't export.

 

If net metering is really a non-starter and the deal on My Solar Roof really is as bad as is being cited (which would explain the poor take up) I'm more likely to go with an off-grid system with grid backup for dull days / higher loads (water heaters would use grid power exclusively). OK it will need batteries which wear out, but I can use cheaper inverters needing no approval from anyone.

 

Of course with batteries we also get the UPS functionality meaning we are totally grid independant, even here (only 50km outside BKK) power failures are common enough that our genset gets regular exercise.

 

 

 

 

Consider low cost modbus metering to gather bidirectional power data.

I use inexpensive modbus metering to remotely log and view our work shed power consumption and supply parameters. The single phase modbus meter sits inline between distribution board and PEA meter.

If I were to add unapproved solar grid tie to the system and wanted to avoid negative readings at the street I would most likely use meter data to either rough compare against initial PEA stored reading or avoid export completely. This could be achieved via separate single board interface that switches out or diverts the grid tie.

100A single phase mobus power meter

This hardware store..

https://www.google.com/search?q=12.949010%2C+100.904101&rlz=1C1OKWM_en

12.949010, 100.904101

17 minutes ago, grollies said:

Your later comment re: pneumatic testing at millibars or a 'couple of bar' pressure holds no water. The OP is testing with air at 7 barG and this is not advisable. The video above demonstrates a low volume compressor failing at 7 bar. Imagine if this was a 2m3 pressure tank that some unfortunate here decided to take your advice and tested with air. And it failed......

It holds no water because its using air. I really don't care about the OP's 100 PSI as it does not enter my argument. You can safely leak test PVC pipe with air and that's a fact. No amount of tube videos, regulations or personal experience is going to change that. 

The cheap shots about my knowledge I don't care about, but please stop making up stories about my posts unless you have the evidence to back them up.

Leak testing with air. Apply pressure to a pipe system and monitor the pressure over time. The applied pressure can be from a few millibars to several bar depending on the application.

10 minutes ago, grollies said:

Yep, that's the one, it was on a photo you posted one time about pressure fittings. And if you are advocating pneumatic testing PVC pipe it's you who has lost the plot my friend.

I will leave you to work out the plot.

Just now, sometimewoodworker said:

Please provide any reputable standard that supports your conclusion. Don't forget you are claiming that domestic PVC PIPE can safely be air pressure tested and that is what address.

We are leak testing not pressure testing. If you go back through my posts you will find no mention of pressure when I say PVC pipes can be safely tested using air. The OP shows 100 PSI which is his story not mine.

Just now, grollies said:

Like I said, you don't know what you are talking about. And, with respect, I've seen photos of your farm with HP triple-ram pumps capable of 40 barG water pressure.

I think you have lost the plot. The only ram pump I have is on the pressure washer.

9 minutes ago, sometimewoodworker said:

Completely wrong and potentially extremely dangerous. Here is an air pressure fail. In progress 

No not completely wrong. Expand your research beyond the Tube

So if there is no pressurised water available we skip a leak test ?

I guess like Wiki, YouTube is the end game for some.

13 minutes ago, Artisi said:

Well, if it does fail under air pressure it will be dramatic. 

The real dramas occur when plumbers attempt to pressure test drainage pipes using air. 

18 minutes ago, grollies said:

Says a man who doesn't understand or appreciate pneumatic testing. I can elaborate further if you like.

 

I've known of many personnel killed in pneumatic testing accidents.

 

National Grid only allows pneumatic pressure testing of HDPE gas distribution pipelines AFTER an initial hydrotest to check structural integrity. The hydrotest is done at 1.5 x WP, the pneumatic test at 1.1 x WP. There's a reason for this.

 

I personally experienced hydrotest failure twice. If those failures had occured under pneumatic test failure deaths would have occured.

 

Pressure test with water. End of. Period.

We are talking about a PVC home plumbing system which can be safely tested with air and often are. No need to bring in some National Grid regulations and apply them globally. 

Some of the worst accidents on PVC pipelines are caused by water hammer but that's another story.

Plumbers often have dramatic fits about pressure testing with air but continue to charge new systems to full supply pressure creating pockets of air and stored energy throughout a system.

5 minutes ago, grollies said:

DON'T do that again with air. Please.

 

The drop in pressure is due to the elastic creep of the PVC pipe.

If you are within the pipes working pressure there will be no problem or any significant distortion of the pipe.