A bit of an update:
I forgot to mention that those 2 input fuses also measure ok, no indications of a short anywhere. I also desoldered and measured both of the large film caps next to the fuses and they measure good with a multimeter right around their rated 4.7uf.
I also just noticed those 2 white relays which connect the respective live wires, could one of them for some reason not be triggering or maybe damaged? Would it damage the transistor that triggers them If it feed 12v into their coils to test them?
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SMEG induction cooker error EA on both left hand side cooktops
Hi all,
I have a SMEG cooktop with a EGO 72.08041.002 power board. The two left hand side cooktops started to slowly fail, sometimes stopping with an EA error (Power board failure according to the manual) after a couple minutes boiling some water and eventually they completely failed and now get an EA error on both of them at all times. Visual inspection of the board went over ok, I checked the IGBT's and rectifiers and they seem fine, what should I look at next as this is the first time I'm fixing an induction cooker, I'm suspecting capacitors in this case, Which ones should I look...Last edited by Gjackson; 07-09-2024, 03:06 PM.
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Question about UE60JU6800K backlight power.
Hi all,
got my hands on a Samsung UE60JU6800K, initially it apparently had a bunch of white circles on screen which I confirmed was due to loose diffusers when I opened the set up and found a mountain of them at the bottom. The person I got if from stored the TV unused for a lengthy period after this so when I got it the backlight was completely gone. I took out the strips and almost all of the LED's have a crack on the yellow phosphor form the center of the LED outward, the ones that don't have this crack seem to work still (Maybe due to humidity after a long period?). Anyways I...Last edited by Gjackson; 06-11-2024, 06:09 AM.
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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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