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Hi,
you have to estimate/simulate the expected preveailing temperature and keep it within the maximum operating temperature of the used PCB technology/material, see.
BR
Hi,
as I suspected there is something going on with the reset IC (IC11 - PST259D), I ordered a replacement on Aliexpress. This solved the problem, the tuner is fully functional again.
Hope this repair is of use for someone else.
BR
As you have mentioned quite high temperatures and a temperature measurement on the PXB (hot spot on the PCB), you should keep the glass transition temperature Tg and the maximum operating temperature MOT in mind. You have to select/produce your PCB accordingly, see here. But as pointed out by...
Hi,
please share the ENGLISH datasheet. It's not possible to copy the text out of the chinise one I linked in reply #2, so no change to translate it.
To me it looks like the intention of the NTC is to protect the cell i.e. against thermal run-away. So it should be placed in the vicinity of the...
Hi,
I still do not get how the described circuitry/setup might be damaged by an inductive flyback. The simulation below shows the actual volatges at different points along the inductive connection towards the cell, as I understood the charging circuitry. Here, the back-to-back MOSFETs are used...
Hi,
my XIAOMI vacuum cleaner robot complained since a while that it's left wheel got stuck although there was no obstacle. He even some kind jumped when I was able to observe this issue. Below a solution for my problem can be found.
First thing I tried was to clean the wheel and the related...
Hi,
how does your setup look like by means of actual layout and connection to the cell?
Which IC is actually used? The schematic shows the LGS4054 and in the text you mention the LGS4056.
How does the handling look like when a damage occures, is it "reproduceable"?
According to the...
I haven't experinced any damage which capacitors in the nF ranges as well, and I would consider 100 nF also as rather low. Neverthless, I have used diode "isolated" capacitors in the µF ranges a couple of times at the input of logic gates, to "store" and provide a high level (also without...
Hi,
I got a KT-3050L Stereo Tuner from Kenwood for repair. The service manual can be found here (and attached). Below I have attached an excerpt with measured voltages. Luckily the service manual states the expected voltages. In gerneral, the display is completely dark, and at least the STANDBY...
Hi,
the power rating highly depends on the used technology i.e. a thick film resistors can usually handle more power than a thin film one.
But as Klaus mentioned, have a look in the datasheet for example you may also consider the power derating vs. temperature. The start of derating...
Hi,
IMHO this video is not really good to explain the inductance of a return path, as indicated in the link. Here, the "input" trace is missing, and consecently the area spanned by the loop and the overall inductance, see [1].
If considering the the trace alone, you can check [2], chapter 8...
... also wich transformer are you using. It looks like is not on the PCB, so leakage inductance will depend on your setup, limiting tranfered energy. Also, the transformer might simply not be suitable for a push-pull topology or operating frequency. What's your target output wattage and voltage...
Hi,
have look on the following two links [1],[2]. Here just keep in mind the shown slot also corresponds to a discontinuity of your GND plane (must not be an actual milling). Also keep in mind, a large spanned loop area corresponds to a large inductance [3].
[1]...
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