You will need it if you want to see: the SMPS output drive is putting out, if the switching transformer is putting out the signal (typical AC meter will not have enough bandwitdth to measure AC in 30k~100KHz), AC ripple at the power supply DC output, Video signal, LVDS, clock signals, etc. I would say yes if you are want to really dig deep into the troubleshooting world. But like I said, play with it at your work place first to get use to how to operate it and what you should see and what the waveform of all kind of signals look like, etc.
OK, I couldn't wait for Ebay. I had to have one, do you know how it is
I have purchased a Fluke 87-5 from Amazon(VIPMART) for $250(!!).
I have called the guy and he confirmed that it's indeed is new and comes with the full manufacturer's warranty.
There is a promotion going on now at Fluke. Here is the link:
I have selected the bag. Hats I'm not wearing, I'm not electrician, so I don't need those magnetic holders and flashlight I have.
I have got the Rigol scope and successfully converted it to a 100MHz scope!
Very easy, just downgrade the firmware, run a tool which changes the model and serial number and upgrade the firmware and it's done.
Another thing you should have is the Isolation transformer, do not use your new scope on the Hot side of the circuits withouit having what ever your arfe working on powered by the Isolation transformer! otherwise you will blow up your scope and the bridge rectifiers, and etc. in the hot side of the circuits since your scope probe ground is more likely to be connected to the scope power cord ground prong.
Thank you, for letting me know. I will look into it.
By the way, thet Vizio PS acts the same way when it's in the TV.
24V, 3.3V comes on(don't remember the 12V what it does) for a second and drops down.
yes. it's something with the PS, but I can't figure it out what went out.
I try to understand this PS. The big transformer gets one voltage from the primary and transforms it into two on the secondary?
Soon I will get the ESR meter and I will check all the capacitors to make sure that they are all OK.
It seems that the 24V does not have enough juice and the 12V has to much.
"The big transformer gets one voltage from the primary and transforms it into two on the secondary"
Yes, that is correct, there are two secondary windings, one fo the 12v and one for the 24V. I still cannot see how you can have much higher12V output, but not the 24v output since they are generated by the same transformer which it will affect both outputs. There must be open Ground return connections some where.
Both are higher, 13.3V and 26.6V, basically it's exactly doubled the 13.3V.
The 13.3V under load goes higher and the 24V under load drops to I guess to 0V(never waited because it goes down slowly.
Another thing you should have is the Isolation transformer, do not use your new scope on the Hot side of the circuits withouit having what ever your arfe working on powered by the Isolation transformer! otherwise you will blow up your scope and the bridge rectifiers, and etc. in the hot side of the circuits since your scope probe ground is more likely to be connected to the scope power cord ground prong.
If you can get one, I would highly recommend a variac too. They can be very useful to slowly power up a circuit after you have replaced some expensive MOSFETs or bridges. The components will get hot before they fail and smoke if there is a fault somewhere. You can get isolated variacs which combine the two features. If you have a powerful variac like mine (4000VA) you -will- need an inrush limiter, or you will trip the breaker all the time when you switch it on.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
That does not make sense since the primary circuits is still driving otherwise you will not have the 12v output on the 12v winding, so it means that the 24v winding must still be putting out the AC but the rectifiers are not. You can use your new scope to look at the 24v output winding.
But you ar saying that the 12v under load the out put gets higher also and it stays like that? Check the ground traces of the 12v and the 24v section, when you mount the board into the chassis, see if the 12v ground is still connected to the 24v ground. Also measure the DC of the 12v ground pin and the chassis, and also 24v ground pin and the chassis.
I have purchased a Fluke 87-5 from Amazon(VIPMART) for $250(!!).
Excellent deal if it comes with full warranty. In Canada, I would have to pay $500 get a new 87V.
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Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses.
2) There is also the question of warranty. Typically, most Canadian HQ will NOT provide warranty unless it is purchased in Canada from an authorized dealer. As a Canadian, buying a new Fluke 87V from an authorized USA Fluke dealer is considered "gray market"/invalid when it comes to warrany claims.
3) The above is also common "practice" for TVs, cars, PCs, etc.
4) Right now, I have more multimeters than what I need, but I'm willing to get an Fluke 87V or 87IV or 89IV at the right price.
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If this auction is directed at me, it states (like most professional sellers)
ABSOLUTELY NO INTERNATIONAL BIDS will be accepted (including Canada)
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I haven't checked that. Sorry.
Your right, I forgot about the warranty. Maybe for this price you could trust the meter and you could lose the warranty.
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
hello.
A few months ago,I have purchased 0.1mm Soldering Iron Tip of below aliexpress link,But I noticed that It is totally impossible to use this 0.1mm iron tip in the T12 soldering station https://ko.aliexpress.com/item/4001275635593.html
Is there any good soldering station which is possible to use 900M-TJ-I tip and have inexpensive or reasonable price in aliexpress?
Any reply would be appreciated.
This is a guide that I am writing for helping others to replace their MEC1503 EC chip if it breaks (or to get around an inconvenient prompt to the BIOS). This forum has been extremely helpful to me so I would like to contribute to help others. I will tell you right now that this task is very difficult to do. You MUST have experience and tools to do precision micro-soldering, BGA reballing, trace repair, and general laptop repair skills.
There are some specialty tools needed to do this task. The replacement MEC1503 chips can be acquired from Aliexpress. Do not buy the bare chips as...
I purchased this soldering station when it was on sale at amazon. It had a slew of one star reviews, but the price was low enough that even if the controller and PSU were toast, the handle tips and stand were worth more than the price. All of the reviews mentioned that the unit was either DOA, or died on the first use. I looked on Aliexpress and the first clue was that KSGER still sold the 220V version of this station, but all of the 110V versions had been discontinued. I figured That there was a problem with the 110V on the power suppply and the controller would be fine.
Hi,
I'm looking to get on Aliexpress a hot air soldering station for hobby use, nothing too fancy, just something "reliable" and budget-friendly.
Any recommendations for a "good" cheap one that gets the job done?
Thanks in advance
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