Member Avatar for Dalla_1

Hello everyone,
I have a Sony lv-240J and I it turns on all the fans spin but then there is no beep, no boot, no display or anything. After a couple of minutes it just turns off. I connected a display to it and nothing. I tried to use it as a display, it gets read but nothing on the screen. It has been like this for 5 years and I just bought a new motherboard and still no results. I tried a new hard drive with windows on it, still nothing. One ram stick and without ram still nothing. I don't know what to do at this point. Please help me as soon as you can. Thank you

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  • Latest Post Latest Post by rproffitt

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A quick reality check on this model, : the LV-series HDMI jack is input-only. There is no HDMI/DVI video output, so connecting this PC to an external monitor will never show a picture. Conversely, the built‑in panel can show an HDMI source even with Windows completely off. Press the HDMI SELECT button; the indicator should turn green, and pressing MENU should bring up the on‑screen display (OSD). If you get handshaking from the source but still see no OSD or image, you likely have a display/backlight path problem independent of the PC side. See the HDMI Input section in the user guide for the exact behavior and buttons to use. Sony VGC‑LV240J/S User’s Guide: HDMI Input. Also, this VAIO takes AC mains directly (internal PSU board), not a 19.5 V laptop brick. VGC‑LV series specs showing AC 100–240 V and HDMI Input only.

If you want a simple, step‑by‑step isolate test (building on and ):

  • Unplug AC. Open the back. Disconnect the LCD panel/LVDS and backlight connectors, all drives, card reader, webcam, Wi‑Fi, and any daughterboards. Leave only motherboard + CPU + cooler + one DIMM + the internal PSU board. Power on. If it still shuts off after a minute or two, suspect PSU/thermal (verify the CPU fan is on the correct header and spins).

  • With a multimeter, check rails at a SATA power plug while it is trying to start: you should see about 12 V and 5 V hold steady under load (3.3 V may be unused). Wire colors typically follow ATX convention: yellow = +12 V, red = +5 V, orange = +3.3 V. Intel ATX design guide color codes.

  • If the board stays on only when the panel is unplugged, chase the panel/backlight path first. If it still power‑cycles with the panel unplugged (and after a motherboard swap), the internal PSU board or a shorted daughterboard is the top suspect. At that point, a shop quote may save you time.

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Member Avatar for rproffitt

Bad news I fear. A good motherboard is usually all it takes to bring back a dead laptop. However try the following.

  1. NEW CMOS BATTERY. Cheap.
  2. A reset like this. Unplug AC, battery, then press and hold the power button for 60 seconds. Release, apply battery, power and re-test. If this is dead still then you have a dead laptop.
Member Avatar for Dalla_1

It is an all in one computer. I don't think it has a battery. And when I hold the power thing, do I do it with the mobo or without?

Member Avatar for rproffitt

WIthout a motherboard would not make sense as the reset resets something or some motherboards.

As to the battery, I've yet to see a PC without a CMOS battery or a means to power the RTC and settings chip. If you didn't find it, you likely missed it or can't identify parts like that. Google up something like "Where is the CMOS batter on ____"? Fill in with your model number.

Member Avatar for Dalla_1

At the top where you said remove the ac and battery, did you mean the cmos battery or physical battery for power source. Because this isn't a laptop, it's an all in one desktop computer

Member Avatar for rproffitt

That reset is generic and you roll with the changes. Try it without the battery, try it without power for sure. The key here is you must try. This is not what Yoda said. You must try.

Member Avatar for Dalla_1

Could you make it more simple? All the steps the steps I mean. I don't really understand

Member Avatar for rproffitt

Simple as I can. Remove power, press and hold the power button for 60 seconds, release and test the machine. It's just a simple reset that sometimes brings a machine back. If not, it's a deeper problem.

Member Avatar for dbtoo

I was just wondering if you had done any upgrades prior to this happening or made any changes to the unit?

Member Avatar for charval7

If you tried already what they've told and still nothing happens, then here are a few questions I need to ask you.

1- did you experienced anything abnormal on your computing like slowness or freezing before this happens?
2- are you the only one who's using this computer?
3- is this located near a rack where-in there are liquids or liquid container siiting on that rack?
4- how old is this computer of yours, or how many years have you been using this device?

Member Avatar for charval7

This these:

1- open the back cover of your device, (make sure it's turned off and unplugged feom the power source wall socket).
2- remove the processor and try cleaning the contacts of the processor's grid array pins (motherboard side), and contact pins on your processor side.
3-reinsert your processor and try it again.
4- if you happen to have a VOM, try measuring for the 12volt, 5volt, and the 3.3volt power rail after you have pressed the power button.

Member Avatar for Dalla_1

1- no it was perfectly normal
2- yes i am the only one using it
3-no
4- it stopped working like the display and everything 7 years ago.
Also I have not been trying to upgrade anything

Member Avatar for rproffitt

Sounds like you've reached the end of your own repair skills. Get estimates as most of these are cheaper to replace than fix.

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