Re: Lenovo L460 LAN issue after BIOS dump flash
Hy everyone,
Is there a specific software to do a BIOS backup before trying to mess up with it?
I would like to do some testing on the file
thanks...
tomalamix
Member
Last Activity: 04-06-2023, 02:27 AM
Joined: 11-09-2020
Location: Portugal
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Re: bios password Lenovo L460
Anyone can give a tip about this?...Leave a comment:
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Re: bios password Lenovo L460
Hy everyone,
Sorry to dig this up but I would like to know how can I read the BIOS dump.
Can I do it using the computer or I need to disassemble the PC and read it from the board?
thanksLeave a comment:
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Re: LG 43UM7100PLB - No image, just sound
@Biruslapio: Do you think is the panel and not the board? I guess that the panels are very reliable nowadays, but I'm not as experienced on this as you guys.
@nomoresonys: I can check that caps, but i don't think I don't know which caps you mean exactly. I put a picture of a board here, if you can point me which to test I will use my esr02 capacitor tester to check those.
[/url][/IMG]Re: LG 43UM7100PLB - No image, just sound
@Biruslapio: Do you think is the panel and not the board? I guess that...Leave a comment:
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LG 43UM7100PLB - No image, just sound
Hy everyone,
My living room TV is gone, no image and just sound, complete black screen.
It is only 2months out of warranty and I've toke it to LG, it is a very recent unit and the warranty has expired just 2 months ago, diagnostic: mainboard problem and must be swapped, the price is more then the TV it self so is not worth it.
I've explored a few 2nd hand units with the broken screen (the most common problem on LCD panels) and I've found a 49UM7100PLB, the mainboard is exactly the same. I've bought it, made the swap but nothing on the screen.
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Re: Electrical heater controler
back to the project now...
The diode is connected to C18 and is a EIC65 218D5. Can't find anything on the web about it.
What about the bridge output, how to be sure about how much voltage should be in the Output? By reading the datasheet i cant be sure.
thanks...Leave a comment:
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Re: Electrical heater controler
Hy,
Did you had the opportunity to check my message? thanks!Leave a comment:
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Re: Electrical heater controler
Hy!
How do you know that the output value is 8 VDC? I cant get that from the datasheet. Sorry to ask.
thank you!...Leave a comment:
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Re: Electrical heater controler
I've replaced C18, problem remains. Ther diode next to C18 is a EIC41 218D5 , can't find anything on the web about it, testing values are Uf=712mV C=599pF.
I'm starting to give up about this, I can't see anything obvious failing...
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Re: Electrical heater controler
Ok, measured in the ~~ side, there is 5.8V AC, both resistors are inside the expected value.
On the +- side there is 3.8V DC
I've solved the grounding wire that wasn't properly connected but the problem as returned to stage 1, the light fades away, so does the LCD display, but now its worst, the unit doesn't come up after a few seconds stays apparently Off without responding to any inputs....Leave a comment:
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Re: Electrical heater controler
How much voltage should be in the output since the input is 220V ? By reading the datasheet I can't understand the correct value....Leave a comment:
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Re: Electrical heater controler
Well, I've tested it, i've connected the 220V on the line of the PCB and measured the output on the B10S. There is 2.4V, i think its working properly.
Meanwhile I've detected a pin without proper grounding, the wire that connects there is not conducting properly, I'm going to change this wire and test again everything, i'll keep you guys postedLeave a comment:
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Re: Electrical heater controler
Ok, i've uploaded the photos, I don't have any other camera then the phone so this is waht I can send. Searching around I can't see anything out of ordinary, nothing roasted, not even that typical smell is present.
Some notes about the photos, I've rebuilt a track that i've destroyed near the polyester capacitor, but it was working before so the problem isn't there. Another thing is that the new polyester capacitor is 310instead of 275V if that matters.
About the rectifier, I see there a BC B10S just after the polyester capacitor.,...Last edited by tomalamix; 02-03-2022, 06:17 AM.Leave a comment:
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Re: Electrical heater controler
Ok, i've tested the ESR02. The new capacitor 4.7uF 50V is reading 4800nF, 4ohm for ESR and Vloss 3.5%. It's not perfect but better than the previous.
The new 0.15uF reports 145nF, no ESR value again and no Vloss. At least the capacitance is in the right range.
The 0.47uF testing gives me 480nF with 4.8ohm ESR, no Vloss value too.
Everything assembled and the unit worked properly!! But only for...20 seconds...
The back light was on, the power LED was on and I was changing the temperature...Leave a comment:
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Re: Electrical heater controler
Ok, i'll go for those two, but what about the 0.15uF that reports 1005pF ? It's not worth to swap too? Am I doing something wrong? Sorry for the silly question.....Leave a comment:
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Re: Electrical heater controler
Ok, Im going to remove both just now and will write the result right away:
Ok, both rated for 275V, one is 0.47uF, while testing gives me 259.7nF with 3.8ohm ESR. Almost half the capacitance it should have.
The other is a 0.15uF and reports 1005pF, no ESR value (strange...). The reading is wayyyy too low. Should i do some other testing to be sure? I've disconnected only one leg of the capacitors, discharged both and done the testing....Leave a comment:
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Re: Electrical heater controler
Sorry, i thought i did uploaded those correctly. I have the controller disassembled, if you need some closer picture to some area please tell me.
Meanwhile I'm going to try changing that capacitor 4.7uF 50V that is reading 4900nF, 10ohm for ESR and Vloss 4.5%. Unfortunately will be a JACKCON again, my local eletronics store doesnt have another brand. Later and if the problem is solved I'll go for Panasonic or Rubycon.
If you guys see anything else worth to test please tell me, I'm getting used to test my new ESR02 Pro :g...Leave a comment:
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Re: Electrical heater controler
Hy sam_sam_sam!
Thank you for your input.
I dont have a power supply to put 5V inside the controller rail and at this moment, but i can explore that
About the heating element, its clearly a relay, it's covered with that hot glue that you can see in the picture, but that one is working properly, it turns off the heating element when the temperature reaches the desired temperature and turns on when the temperature is dropping too much.
The appliance works 100% IF i dont touch the buttons that makes...Leave a comment:
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Electrical heater controler
Hy guys!
Today Im posting a few photos from my electrical heater controller.
The thing is that it turn on just right but as soon as the backlit comes in when I press the UP / DOWN temperature buttons the displays fades at such a point that the display fades completely progressively in 1-2 secons, its noticeable the display fading away, then the backlit stays really weak and the power LED goes out.
Everything comes back to normal after a 10 seconds that is the time the backlit should remain ON while i change the temperature setting.
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Re: Abit NF7-S v2 Recap - Not posting
Ok then!
I'm going for this ESR02 Pro, it seems to be more then enough for my needs.
About the oscilloscope the analog solution is not the best solution for me because I have a thing here called wife that yells with me if she sees anything bigger than a multimeter or something in my desk
And she's right, I don't have plenty of room for my hobbie, I have to keep things as small as possible.
Thank you so much for your help so far, and I have the right PCB to try this new tools: it's an heater controller...Last edited by tomalamix; 11-23-2020, 10:56 AM.Leave a comment:
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