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Re: Help a newbie with his first project
Better, but when you put the power, what voltage do you have on pin 3 of PU100?Comment
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Re: Help a newbie with his first project
So I will wait for the PU100 to arrive from China.. Anything else I can do in the mean time to diagnose?Comment
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Re: Help a newbie with his first project
You can try to find the capacitor CU26 which is connected to the ground, you also have PD5 diodes connected to +RTC_CELL, which is connected to CH50, CH51 and CH52 to ground. If you remove PD5 and you still have 12 ohms, then PU100 is probably the problem. Good luck.Comment
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Re: Help a newbie with his first project
At this point, there is no need, PL101 is on the rail +3VALWP and you check the +3VLP. When you remove the PD5 diodes, you separate the other capacitors, this way you know that the problem is not these capacitors if you still have 12 ohms.Comment
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Re: Help a newbie with his first project
You said in your message #41 "Removing PC101, makes Pin 3 report at 180 Ohm now" and at #43 "Still only 1.2V.." What resistance do you have on pins 1 and 3 of PD5, always without power.Comment
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Re: Help a newbie with his first project
Sorry, but it was between pin 1 and ground and pin 3 and ground of PD5, you said you have 3.3V at pin 3 of PU100 without PD5, which means that the short is after PD5, that's why I asked you to remove it. You have capacitors connected to pin 1 of PD5, so the 12 ohms should be there too at pin 1 of PD5. Also remove the RTC cell to check the resistance.Comment
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Re: Help a newbie with his first project
I only have 1 Ohms of resistance on Pin 1, however I do have about 12 Ohms on Pin 3 shortly after powering the board, this resistance seems to increase over time after removing AC however
I tried removing the RTC cell, but that did not seem to change anything.
Last edited by jacobtc; 05-03-2018, 02:24 AM.Comment
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Re: Help a newbie with his first project
If you still have the 3.3V on pin 3 of PU100, then the short is on the pin 1 of PD5. You can check CH50, CH51 and CH52, maybe on of them is short to ground.Comment
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Re: Help a newbie with his first project
When soldering back PD5, I got 1.2V on Pin 3 on PU100 again, I will check CH50, CH51, CH52 now.
EDIT: I have absolutely no idea where CH50,51,52 is located, I'm guessing it is this area, but it is just clusters of caps... https://imgur.com/a/kPDWQ4bLast edited by jacobtc; 05-03-2018, 06:44 AM.Comment
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Re: Help a newbie with his first project
The best way is still with the reading of the resistance to find those capacitors, if you look at page 23 of the schematic, they are in parallel, so you need to find three in parallel and they are connected to pin 1 of PD5. Don't put back the RTC cell and PD5.Comment
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Re: Help a newbie with his first project
Pin 1 of PD5 is short to ground somewhere. When I measure the caps, and Pin 1 for continuity, several seems "connected" to Pin 1, but that's just because it is shorted to ground...
EDIT: I just measured most of the caps in that area, and none of them seems to have both sides short to ground..Last edited by jacobtc; 05-04-2018, 04:42 AM.Comment
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Re: Help a newbie with his first project
It will be difficult to find these capacitors.Comment
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ABOUT ME INTRODUCTION FILE
2024 BEV, BIH, SARAJEVO START PROJECT: ELECTRIC VEHICLE TOYOTA 4 RUNNER CONVERSION http://www.bev.ba/TOYOTA4RUNNER/index.html
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2019 BEV, Croatia, Ston:, Broce: PROJECT - PROJEKT ELEKTRIΔNI GLISER http://www.bev.ba/ELEKTRICNIVANBRODSKIMOTOR/indexHR.htm...12-28-2023, 02:09 PM -
Hello guys,
I have a Philips 240B7QPJEB. The monitor seems completely dead.
I opened it and measured the voltages of the powersupply. I found that a mosfet was dead and replaced it.
On the connector, that goes to the TCON board, all voltages 15-19V and 5V are present.
The small connector on the left of the PSU has two cables with 18V and all the other have 0.2V. It connects on this small connector on the left ontop of the panel. I guess the backlight? Seens fine I guess.
The weird thing is, that the Power LED is powered over the TCON board.
On The TCON...12-28-2024, 02:12 PM -
Hey guys! i build a 30V 3A powersupply. My friend blown it... He connected cables to the wrong connectors. I changed the op amps, shorted zener diode and a 9014. Now the powersupply works again but only to 6V. When i measured the caps they looked in spec. But after i connected 2200uF cap on the main power rail parallel to the C1 - 3300uf one - output voltage is now regulatable to 8v. Any idea where to look ? or what to do ? R1 and R2 are getting hot. The input of the transformer is 40V after rectifiers. Its a 24V transformer on 230V mains voltage.... -
Right now Battery Hookup has these e-bike battery packs that are used but I am going to remove them and test them and see how good they are and maybe resell or reused them for another project this is for another day
When I get the rack mounted enclosure that I mentioned in another post I will see how well they fit in the enclosure and how much room I will have left
https://batteryhookup.com/products/3...ttery-with-bms
These battery packs are a little bit hard to get out of the enclosure because they were a little bit glue... -
I have an interesting project here. I have a HP RTX 3060 12GB VRAM GPU with a shortcircuit between a (what I believe is) a coil and a cap. The short circuit is so bad that it will trigger a failsafe on the PSU.
I'm a beginner in this field and have managed to do only very simple board repairs so far. I have basic understanding of the components (mosfets, caps, nand chips) but completely diagnosing a board with schematics would be challenging. In this case though, I'm going to hope that replacing only the two shorted components will bring the card back to life (if none of the IC's...
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