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Unfortunately the laptop has been salvaged and it seems that the S/N sticker is no longer there, I tried to search for it everywhere but didn't find it anywhere. I would have certainly posted it otherwise, Is it possible to proceed without it?
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Hi! I have a Lenovo L340-15IRH FG541 FG741 NM-C361, bios chip is Winbond 25Q128JVSQ. Laptop charges and powers on, power button and power light are solid white, keyboard turns on for a second or two and goes back off, fan spins and then also turn off. CPU get's warmer and fans turn back on after a while. Absolutely nothing on display and no back-light either. no display on external monitor and Caps Lock does not respond, doesn't seem to post.
I tried to reset CMOS but no dice.
I've attached the BIOS I attempted to dump with raspberry PI and flashrom. File size looks OK so I think it's...
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Yeah I suspect there's something I missed on the feedback line, maybe something else got fried alongside that resistor, I'll go over it again. But at this point I'm convinced that the PFC is the issue. Here's some snippets I took from my scope on the 12v line. The one with the recurring spikes at 50hz is while I was simply probing the PFC IC feedback pin with one probe of the DMM, the other one is while It's running alone. Possibly some capacitance issues from the fact that simply touching it effects it. Strange that the spikes occur at 50Hz too...2 Photos
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Yes you're right, same with these PSU's, they too use a comparator IC (IC132 OAR6YA in the schematic). I haven't suspected anything there due to the fact that the 12v output voltage is pretty much spot on, apart from the noise. I'll try swapping that too, worth a try. As for the driver of the mosfet are you refering to the hot side driver IC? (DAP049 or DDA001AG)
Thank you....
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Yep exactly right, I guess this configuration allows for higher power? But alas I replaced both the mp6922 and both mosfets and still the issue remains. I checked the 12v and 5v rails with my scope during operation and lots of noise appears on the 12v under load, so I suppose 12v is the issue and not PFC? Still confused as to how probing the PFC controller stops the whine if 12v is the issue but anyways. I really don't know where to proceed from here, I went ahead and also swapped both mosfets on the hot side of the 12v smps and still the issue remains. Maybe I can proceed with checking the capacitors...
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Yep, not much to go wrong there to be fair, Maybe the mp6922 is acting up? I can try replacing it with a donor and see if that solves anything. I am not sure wether I should be looking at the 12v circuit or the PFC honestly, I kind of focused on the PFC due to the fact that as soon as I probed the feedback pin of the 1612A3 the coil whine ceased, so i assumed that something was wrong there? Since you mentioned that coil whine usually originates from the secondary side, maybe that ultrafast diode on the PFC secondary is bad? It checks out fine with a multimeter but I suppose it could be leaking...Last edited by Gjackson; 01-14-2024, 08:18 AM.
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here's a link to a schematic of a very similar power supply.
[url]https://elektrotanya.com/sony_play_station_ps4_adp-160cr_psu_power_supply_sch.pdf/download.html[/url]https://here's a link to a schematic...oad.html[/url]
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They both check out fine I think, both at 63uf on my cheap meter when they are marked at 68uf. So I don't think they're the issue. To be honest I did suspect them because at one point while i was power cycling the PSU the PFC somehow boosted them up to over 450VDC before shutting down which is over their rated voltage. But i suppose it was quick enough that they didn't get damaged. Could it possibly be the NTC on the output side of the bridge rectifier?
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ADP-160FR ps4 slim PSU, shuts down under load and has severe coil whine.
Hi all, the PSU originally had a no 12v issue where as soon as I bridged the 5v standby to the ACDC_stby the psu would switch itself off completely. I monitored the voltage on the main filter caps while doing this and saw that the PFC was bringing the voltage up to around 360vdc before shutting down. Given that I saw that as a little low I replaced the PFC feedback resistors from a donor PSU and that got it to power on, without a load no coil whine is present and there is a stable 12v however as soon as I put it in the PS4 it starts whining really badly, however 12v remains stable but after a...Last edited by Gjackson; 01-13-2024, 11:07 AM.
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Re: Delphi MT60 Car ECU Revisit - No activity on CPU
Update:
Got the new gate array and replaced it successfully, unfortunately nothing seems to have changed however I haven't tried it in the car yet. I did however get my hands on a decent scope so I checked both the crystal and SMPS. Crystal seems to be oscillating good at 8MHZ on one pin however the waveform has a lesser amplitude and looks distorted on the other pin, I'm not sure if this is normal (see pics)
I checked the 2 coils driven by the power IC to see if they are switching correctly. They...
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Re: Delphi MT60 Car ECU Revisit - No activity on CPU
I was hoping the ECU would occasionally poll to check for other devices which Is what I was looking for on the scope, I made sure the Ignition was getting 12v but since I don't have the car available to test on I had no other module to connect it to to test communication. That might explain the steady 2.5v
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Re: Delphi MT60 Car ECU Revisit - No activity on CPU
Hmm strange, the car that the ECU came from didn't experience any of that I believe. Went to start it and it just refused to, randomly. I get reverse polarity frying everything but how would jump starting a dead battery cause damage? I'm thinking current surge or something of that sort maybe?
Couple more questions if you don't mind,
Is the divider network you mention located somewhere on the motherboard generating 2.5v which is then passed by the gate array onto CAN L/H or is it inside the gate array...Last edited by Gjackson; 09-17-2023, 03:19 PM.
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