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Search: Posts Made By: redwire
Forum: General Electronics Technical Discussion Yesterday, 11:40 PM
Replies: 9
Views: 158
Posted By redwire
Re: LED Resistor Calculations ...

I found you can only dissipate a few watts at most with a board that size, unless you add a heatsink or cooling fan.

The LED's have a large (cathode) thermal pad which is supposed to have lots of...
Forum: General Electronics Technical Discussion Yesterday, 11:33 AM
Replies: 9
Views: 158
Posted By redwire
Re: LED Resistor Calculations ...

Cree JB5630 (https://cree-led.com/media/documents/data-sheet-JSeries-5630.pdf) 0.2W class around 2.8V 65mA, 3.0V hot at 150mA. Should be similar. Surprised to see the Vf is lower than rule of thumb,...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-17-2021, 08:21 PM
Replies: 11
Views: 165
Posted By redwire
Re: 878d H-E Error

I would measure ohms at the PCB connector with the two red wires, the one that ends up going to the heater. So plug in the GX connector and see what you measure. The heater should be around 20 ohms....
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-17-2021, 01:36 PM
Replies: 11
Views: 165
Posted By redwire
Re: 878d H-E Error

"H-E" Heater Error, temperature is less than 50C and not going up despite heater (triac) being turned on.
No heat can be due to an open triac or open heating element or bad wiring to the wand....
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-16-2021, 06:39 PM
Replies: 17
Views: 685
Posted By redwire
Re: Nescafe Aeroccino, still fails with new Motor (red flashes only once)

It's good you plowed through the cheapness and found the problem.
I'll bet the original motor had no carbon brushes, just some copper leafs because not much air is pumped over the life of the...
Forum: General Electronics Technical Discussion 04-11-2021, 09:09 PM
Replies: 1
Views: 54
Posted By redwire
Re: Finding appropriate datasheet or equivalent MOSFET

It seems to be NEC uPA2719 P-ch -30V 20.9mohm (-4.5VGS) 2W, ESD gate diode

Newer parts have better (lower) on resistance but hard to find with them with an ESD protection gate-zener diode....
Forum: General Electronics Technical Discussion 04-11-2021, 08:37 PM
Replies: 19
Views: 997
Posted By redwire
Re: backlight tester malfunction

It seems 325VDC is available with open-load, which normally would damage an LED if connected backwards? It starts at low current and slowly ramps it up.
https://youtu.be/IuHZBE2NP7c?t=274
He takes...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-10-2021, 12:42 PM
Replies: 22
Views: 1,097
Posted By redwire
Re: Daewoo microwave oven repair

The question is if microwave oven diodes are slow or fast recovery. They seem to all be fast-recovery, inverter use etc.

For the old B&W TV's and monitors, those HV rectifiers in a cartridge...
Forum: General Electronics Technical Discussion 04-10-2021, 12:27 PM
Replies: 14
Views: 293
Posted By redwire
Re: Inexplicable voltage readings in LED circuits

I had a spat where new chips I soldered in died after running only a few minutes. Likely chinese semi's (SICSTOCK/liaoxiyuan) but I checked my workbench ESD mat and found it was not grounded. The...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-09-2021, 07:24 PM
Replies: 22
Views: 1,097
Posted By redwire
Re: Daewoo microwave oven repair

I think they are too slow switching, I know 1N5408's are worse and blow up in series, when I used three at 2kV.
Even though it's a 50/60Hz sine-wave, the dV/dt is very fast and it takes over 5usec...
Forum: General Electronics Technical Discussion 04-09-2021, 07:11 PM
Replies: 118
Views: 1,669
Posted By redwire
Re: Meters and Microamps

If you drill a hole, that assumes the new fuse-wire can be soldered, and I'm not sure if it's some low temp alloy.

It looks like heating up fuse endcap with a soldering iron or on a stovetop...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-09-2021, 12:42 PM
Replies: 22
Views: 1,097
Posted By redwire
Re: Daewoo microwave oven repair

I found a Panasonic inverter microwave oven in the trash, took it apart and yes it's very light no heavy transformer. Instead it's all electronics, IC's IGBT. It' s battle of high tech that china,...
Forum: General Electronics Technical Discussion 04-09-2021, 12:35 PM
Replies: 14
Views: 293
Posted By redwire
Re: Inexplicable voltage readings in LED circuits

Most ghost readings are due to capacitance between mains and the object. Either stray capacitance, or intentional Y-capacitor (which are added to pass EMC tests). 240VAC 50Hz into a 2,200pF cap is...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-09-2021, 12:13 PM
Replies: 21
Views: 582
Posted By redwire
Re: Fluke 289 multimeter not working

It might be a speaker? Q22 has a clamp diode CR8 and 10R resistor so it's doing something higher current. If Q22 is on, it might be the MCU output that is stuck on. During RESET the MCU 's outputs...
Forum: General Electronics Technical Discussion 04-09-2021, 11:58 AM
Replies: 118
Views: 1,669
Posted By redwire
Re: Meters and Microamps

I could not find much for "fuse adapters". The really old appliance/house screw-in glass fuses, guess who came up with a custom socket size? Good ole Bussmann. He seemed hell bent on making fuses...
Forum: General Electronics Technical Discussion 04-08-2021, 03:36 PM
Replies: 10
Views: 170
Posted By redwire
Re: Can someone identify this LED type?

search "diffused straw hat" should find ones with tinted/diffused package.
Lots on Aliexpress too.
Forum: General Electronics Technical Discussion 04-08-2021, 02:40 PM
Replies: 14
Views: 293
Posted By redwire
Re: Inexplicable voltage readings in LED circuits

Sorry lol it was pressing the continuity button and the Fluke's timing 15:08 and yours were not going well, back and forth, I got confused as what was going to be measured next.

With your testing...
Forum: General Electronics Technical Discussion 04-08-2021, 11:40 AM
Replies: 2
Views: 89
Posted By redwire
Re: Solar Controller MPPT 100A

I would check the programming and see if it did not get scrambled or corrupted. Check that the correct battery type is programmed - lead-acid, lithium, LiPO4, and 12/24V.

If the programming is...
Forum: General Electronics Technical Discussion 04-08-2021, 11:22 AM
Replies: 14
Views: 293
Posted By redwire
Re: Inexplicable voltage readings in LED circuits

You will get weird readings after unplugging power because the bus voltage doesn't fall to zero.
It's around a 12VDC PSU and at say 6V nothing is there as a load, the LED's are off... until a...
Forum: General Electronics Technical Discussion 04-08-2021, 11:04 AM
Replies: 10
Views: 170
Posted By redwire
Re: Can someone identify this LED type?

The height of the LED die in the epoxy lens determines its viewing angle. For wide angle, the straw hat's have not much for a lens, almost flat tops, compared to usual T1-3/4 (5mm) parts. You have to...
Forum: General Electronics Technical Discussion 04-07-2021, 12:12 PM
Replies: 118
Views: 1,669
Posted By redwire
Re: Meters and Microamps

KTK-R (https://www.eaton.com/content/dam/eaton/products/electrical-circuit-protection/fuses/data-sheets/bus-ele-ds-1015-ktk-r.pdf) have the end bump (spring inside?) 600VAC 200kA fast interrupting...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-07-2021, 11:50 AM
Replies: 93
Views: 18,205
Posted By redwire
Re: Whirlpool Refrigerator LED lights flickering

I'm guessing an LED first fails, which then causes the resistor R15 to burn up. The three boards total 12 LED's in series, so any one bad LED kills the entire string.

LED's fail - flickering,...
Forum: General Electronics Technical Discussion 04-06-2021, 09:33 PM
Replies: 118
Views: 1,669
Posted By redwire
Re: Meters and Microamps

You can shake it to hear the sand inside, or simply weigh it.
Measure its resistance to see if the element is reasonable. For sure they sub aluminum which gives higher resistance and the fuse would...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-06-2021, 06:59 PM
Replies: 93
Views: 18,205
Posted By redwire
Re: Whirlpool Refrigerator LED lights flickering

His schematic is out to lunch. Sigh. There seems to be a curse on these Whirlpool LED boards because nobody can draw a schematic. The white solder-mask and conformal-coating makes it difficult. No...
Forum: Troubleshooting Game Consoles & Other Weird Devices 04-05-2021, 01:33 PM
Replies: 21
Views: 582
Posted By redwire
Re: Fluke 289 multimeter not working

Tantalum C51 looks burnt black stripe (near XBT1 pads) and inductor L1 is chipped. I would check both parts.
Showing results 1 to 25 of 500

 
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