Re: LG 42 LK 450N won't start
Post pics of the PSU Bd and the back of the TV.
Are you getting StdBy 5V when you plug into the AC without trying to turn it on?
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Re: LG 42 LK 450N won't start
Anyone? Where to start, which board to suspect? A little 'tick' kind of sound can be heard I believe from the PSU each time the voltages drops and raises.Leave a comment:
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LG 42 LK 450N won't start
Hello
TV goes on and blue led lights on for 5 seconds, then the tv switches off and red led comes. Screen stays black all the time.
something wrong with the power supply voltages, when the TV is on for 5 seconds my DMM shows P. Dim runs between 0v and 3.1v, A. Dim somewhere between 1.7 and 3.1v, INV_ON and Error out rails go from 0v to 3.4v.
Can the inverter and the backlights be checked by jump wiring? I tried a jump wire (680 ohm resistor between) from the 3.5v rail to INV_ON and PWR_ON. Nothing happens. By doing this the main filter cap has only 330v (line is 230AC), PFC not working this way?
Service manual here https://cdn.badcaps-static.com/pdfs/...b64fd020f0.pdf
Not the exact same but many similarities and mostly same components.
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Hi
Yesterday while browsing the internet with my laptop I noticed that 3 keyboard buttons were not working anymore.
Today, the notebook doesn't boot anymore. My assumption is that the keyboard went bad because the power button is on the keyboard.
Is there a way to jump start directly from the motherboard?
I tried to short all the pins of the connector for the keyboard cable with no luck.
I found the schematics here on badcaps, but I didn't find the pin out for the keyboard. But truth be told, I am just a hobbyist who tries... -
Hey guys, long story short, I need the schematic for my “HP Envy x360 13-ay0175ng” motherboard to see what pins I need to short to start it up without a keyboard attached.10-18-2024, 12:56 PM -
I just got this TV in today, and originally it would flash the logo and have no backlight afterwards. I could see the image without the backlight with a flashlight.
Having no 9V batteries or anything on hand, and all the backlight LEDs looking fine during the flash, I decided to jump BL_ON and DIM on the power board/mainboard (White and purple wire) with them still plugged in using some scissors to connect my shielded voltmeter cables.
After jumping a few times, the backlight stayed on. Why?
I didn't measure any voltages beforehand... So just wondering... -
just had a brainwave .
i have here a good set of 18650 cells from a 36v pack . and am wondering how easy and if it will work to be arranged for a 12v jump pack for cars etc . .
just wondering about charging it .. i know it will need the correct bms . its the charger bit i am stuck on .. will a linear charger work ? -
Hello.
I have this Asus X550cc that run only when i jump first mosfet. All reading looks good/ACDET, ACOK, VCC/. i replaced two capacitors on gate of that first mosfet, i replaced second mosfet which was shorted, i replaced BQ ic, but still wont run.
Any advice for this board?
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