YellowJacket
Senior Member
Last Activity: 05-19-2026, 05:18 AM
Joined: 12-27-2020
Location: Slovakia
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This thread can be deleted - I found a short and missing PCIe cap on the card, so no such a thing as a compatibility issue.... -
NVIDIA Quadro K620 2048 compatibility issue?
Hi guys,
it is a long time, since I was fixing GPUs and now I have very stupid problem, that I need help with. First, my PC specification - DELL OptiPlex 3060 SFF, 200W PSU. I needed some cheap GPU for rendering 3D simulations. I picked NVIDIA Quadro K620 2048, but sadly, my PC didn't even recognized it ( no video output, no mention in windows device manager, or under linux ). Before, I was using GTX 1650 4GB in this weird way -> the GPU was connected via riser, and powered from external PSU, both grounds of PSUs were connected, and everything worked just fine. But I didn't like the mess... -
Oh yeah, no problem. I thought, it is related to particular board ( I am not that good in this - bios section ). Here is the binary with clean ME region of the original bios dump:...Leave a comment:
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It costed me quite a lot ( around 100EUR ), but it still worths more than throwing it away. I would fix it by myself, but I don't have a proper programmer, and needed experience to do such a job. I sent the whole mother board to some polish technician, over allegro:
https://allegro.pl/oferta/naprawa-pl...05-13880970846 ( if you consider it an advertisement, you can delete the link ).Leave a comment:
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Fixed by cleaning the MR region from the original bios dump ( thanks to Davide from ERS discord ).Leave a comment:
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Just an update, for others - it was an eMMC failure. I sent it to some guy abroad, he read its binary, repaired the binary and flash to a new IC. TV was fixed.Leave a comment:
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Lenovo Stick 300-01IBY Desktop (ideacentre) - Type 90ER
Hi guys,
came here for some advice with this mini PC diagnosis. The customer said, he can not start the PC. I saw some cold joint on the micro USB port, fixed it. Now I am able to start the PC, but with this behavior:
- 100mA for about three seconds
- then 640mA with blue LED light for very brief time ( maybe less than one second )
- lastly the PC turns off, with no current consumption.
Firstly, I thought it is a BiOS issue, but when I measure voltage at SPI ROM IC pin number 8, 1.8V drops to zero right after LED turns off. 5V still present. Don't know,... -
Well, it didn't help. I bet, it is eMMC. Looks like it is well known SONY issue:
https://youtu.be/tP3oUCX2ID0?si=4pi8bZSplX9iprlV
https://www.youtube.com/watch?v=Y00I6rx70j0
So my question from the first post remains.Leave a comment:
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SONY KD 55XD8005
Hi friends,
i would like to ask for a little help, with SONY KD 55XD8005. This TV suddenly stopped working during playing. I figured out, there is 95% chance, the eMMC memory is corrupted ( based on some yt videos with similar models and some voltage measurements around the eMMC ). I have no programmer for such a memory. Is there anyone on the forum, who can program and sell the programmed eMMC for this board?. I would rather fix the original board, than buy a new one.
Just for information:
- the TV is dead, no reaction either to remote, or to power button on the TV... -
Guys ( especially you, Sephir0th ), you won't believe.
I fixed it. The issue was short at +3.3V_WWAN power rail, which is number 11 in power on sequence. I was stopped at number 7 = PCH_RSMRST#, because of its fluctuation. I stopped checking anything else later on. But then I realized, it is actually ON, but after then it shuts off from some reason. Firstly I though that its fluctuation is somehow an issue.
So I found shorted cap at +3.3V_WWAN​ and now the laptop runs fine. Thank you a lot for your time, I got a lecture - never stop checking every single voltage rail from...Leave a comment:
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UPDATE:
I was able to charge a little the battery ( USB charger plugged in, then inject +17V directly to battery pin ). It took around 1.5A, but only for few seconds, maybe one minute max. Then it took no current at all. Vbat was 14V and main power rail 16.7! Although the board behaved exactly the same. The battery is not charged from the charger.
When I unplug the charger, the battery still connected, the LED on the power button is turned off ( in case of powering from the charger, LED is constantly flashing, like 0.5sec ON, 1sec off ). After pressing it, the LED turns on briefly...Last edited by YellowJacket; 05-08-2025, 09:52 AM.Leave a comment:
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CPU coils are all time low, VR_ON, I found only IMVP_VR_ON ( is it it? ), and it is at 0V. RUN_ON is fluctuating at 3.4V, SIO_SLP_S3# is also fluctuating at 3.5V. See the attachment.
I believe, I have to have 0.6V_DDR_VTT_ON_R (pin S3 of PU200) high in order to generate +0.6VSP ( which is 0V all the time ). That signal is although also fluctuating (attached. Also with S5 pin signal). The EC is the one, who deploys that signal.
PCH_RSMRST# is 3.5V fluctuating, PCH_PLTRST# is 0V....Last edited by YellowJacket; 05-08-2025, 12:33 AM.Leave a comment:
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All selected power rails are fluctuating, see attachments. Only +0.6V_DDR_VTT is 0V. Resistances seem fine to me. Actually all enabled signals are fluctuating, obviously ( RUN_ON for example 0-1.9V )....
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Sorry
Resistance of the 1.8VALW rail is 2k8.
Not sure, what do you mean by S3 and S0. Like what signal. Do you mean SIO_SLP_S3# and SIO_SLP_S0#?Leave a comment:
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Hi.
- I can't locate the PR725 resistor ( boardview unavailable ), but I will try to locate it, it just takes some time. Onboard, it has value 78k2, but yeah, its onboard, it was expected, that value will be lower.
- battery nominal voltage is 15.2V ( "limited charging voltage" = 17.6V )
mcplslg123 - I probably confused you, but the main power rail was stable whole time, there was unstable only voltage at the output of the coil PL701 ( which is probably fine in NVDC mode ). If you look at second picture from my #3 post, you will see its waveform. Its the same...Leave a comment:
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I got the new ISL IC, replaced it, but there is no change, the main power rail is 8.6V, not +17.8V, like it is shown in schematic. I got new measurements around ISL, with the USB charger, here are results ( value marked with ~ indicates fluctuation at this pin. Its AC waveform with peak-to-peak value is attached ):
DCIN = 19V ~
VDD = 5V
ACIN = 3.4V ~
ACOK = 2.9V
Looks like you were right, mcplslg123 , and the power management chip is not the culprit. But now I am really lost. What should I check now? Why is the main power rail so low ( nice and smooth btw )?...Leave a comment:
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Well, next time better do one picture ( or two, if there are coils also on the other side of the board ), and write measured values on the picture ( like for example here, in my thread ). What is more important, don't use diode mode, but switch to resistance measurement. You also forgot to mention the board number.
Btw, do you have any programmer for flashing bios?Leave a comment:
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I believe, you meant `inductor` ( conductor is basically every conductive part of the circuit board ), and then yes, measure voltages at all inductors. It is the best place, where you can measure voltage of a switch mode power supply, because you just can't miss it.Leave a comment:
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Hi. According to your description, I assume, it is bios related ( maybe there was windows update running in background? ). To be sure, measure voltages at all coils, and post here a picture with measured values. Also add the board number of your mother board.Leave a comment:
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Well, the replacement IC is already ordered, so I will just change it, and if it doesn't solve the fluctuation, will dig more. The linked video assured me, that even healthy looking waveform from the charging IC could be somehow defective IC.Leave a comment:
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