how to fix 2D72?

Gatito

приятного дня всем! При ремонте импульсного блока питания ,я не предусмотрел сделать гальваническую развязку с питающей сетью 230 вольт переменного ,разумеется земляной щуп  "спалил"  мне мой осциллограф Хантек 2д72.Не было ни дыма,ни огня,но экран погас навсегда. Есть-ли какая-либо возможность его отремонтировать? Буду благодарен любому совету.

Gatito

have a nice day everyone! When repairing a switching power supply, I did not envisage making a galvanic isolation from the 230 volt AC supply network, of course, my Hantec 2d72 oscilloscope set fire to the ground probe for me. There was no smoke or fire, but the screen went out forever. Is there any way to repair it? I would be grateful for any advice.

amy

Please confirm whether there are burn marks on the board first.
If not, use the adapter to power and test the voltage at the marked points.

Gatito

amy replied at 2022-1-11 16:21
Please confirm whether there are burn marks on the board first.
If not, use the adapter to power and ...

Thanks for the advice, I'll check it soon and report the results.

Gatito

amy replied at 2022-1-11 16:21
Please confirm whether there are burn marks on the board first.
If not, use the adapter to power and ...

Good day everyone! Dear consultant, I carefully examined the board of my oscilloscope (it is slightly different from the one shown in your photo) where the power socket is located and it seemed to me that the U7 object was overheated (I am attaching an enlarged photo) When measuring the voltages at the points you indicated (with the incoming U = 5v) the following was recorded: C22 = 4.86v; C19 = 4.82v; L5 = 0v. During the measurements, which lasted about 5 minutes, I noticed that the board heats up slightly and therefore measured the temperature at some objects: L2, L4 = 47 degrees Celsius; Y6 = 61 and U7 = 86 degrees Celsius.


if I understand correctly, is element U7 - TLV62565 or TLV62566?

amy

U7 is TLV62565DBVT.

Gatito

ordered on ibee U7 - TLV62565 and U6 - ETA6002E8A, as soon as I get it I'll try to change it, maybe I'm lucky

Gatito

after the end of the mourning for my burned-out oscilloscope, I had to make myself a transformer decoupling from the 230 volt network so as not to burn the new one, and it’s safer for myself.I recommend it to everyone who doesn’t have one yet

Gatito

Today I received a TLV62565DBV-element U7 ... it also has a designation on the case - SIK.
I'll try to replace it. Let's see what happens)))

Gatito

During the replacement of U7, it turned out that under the case the area between the GND and EN terminals was burnt out, and there were signs of swelling in the lower part of the case. The faulty voltage converter was replaced with hot air using thermal protection of the surrounding elements.
A voltage of 1 volt appeared at the output of the SW. The oscilloscope did not turn on, but the elements described above no longer heat up, except for the U6 Switching Charger with Dynamic Power Pat chip, and the heating is noticeable.
Based on everything, I will wait for the U6 chip to arrive, aka ETA6002E8A