I have this Sony laptop which does not switch on. Even the supply indicator on the front does not light up. i have opened the laptop. the supply is getting to the connector on the motherboard but i don't have any information to trace the voltages elsewhere on the motherboard. Can anyone help? May be a circuit diagram for the PSU part othe motherboard.
Mtherboard is MBX-86
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Rear fuse box. INT LP 10 amp . there is also INT LP relay in the same rear fuse box .
Fuse Block - Rear
Under the rear seat, on the left side of the floor pan
The INT LP fuse in the fuse block - rear supplies battery positive voltage to the normally open switch contacts of the INT LP relay. The INT LP fuse also supplies battery positive voltage to the INT LP relay control circuit. The fuse block - rear also supplies battery positive voltage to the relay control circuit for the front courtesy lamp. The door modules communicate on a simple bus interface (SBI). When you open any door, the switch contacts of the door open switch close. When a door open signal circuit is grounded, that door module sends a message to the drivers door module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the rear integration module (RIM) in order to indicate which door is open. The RIM activates the INT LP relay in order to provide battery positive voltage to the interior courtesy lamps. When any front door is opened, the RIM will energize the FRT CTSY lamp relay grounding the I/Pcourtsey lamps at G302. Depending on which doors are opened, front or rear, the proper interior courtesy lamps illuminate. The RIM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using it's own respective switch
if their is no any power indicator that light in the front panel, it was a power supply board failure. you must look first the fuse if busted, then before you replace it ensure no other part has damaged like shorted diode, transistor, transformer and regulator.
The Wireless LAN switch on your laptop is located to the right of the SD card slot and power indicator lights on the front of the laptop. If this does not work, the entire Users Manual can be accessed by going to:
Blinking of standby light in Sony sets anre fault indications. There will be a specific number of blinks for each fault, from which we can understand the actual fault section inside your Tv. Count the number of blinks by Switch On and Switch Off by its front panel ON-Off switch for atleast 3 times, and confirm it. Just send me the exact number of blinks through Fixya. I'll assist you Ok.
Your laptop uses a wireless "Switch" located on the front edge of the laptop on the far left side. There will be an led indicator light to the right of the switch itself. Move the switch to the right to activate the wireless radio. Move the switch to the left to de-activate. Below is the link to the user manual for your laptop. It is in PDF format, so you will need Adobe reader to open it. I am also giving you a picture below of the front edge of your system.<br />
<a href="http://www.docs.sony.com/release/VGNNS300_series.pdf">http://www.docs.sony.com/release/VGNNS300_series.pdf</a><br />
<br /><img src="http://www.fixya.com/uploads/images/96F2F95.JPG" />
Intermittent dead with red standby light on, but won't switch back on,
comes back on it's own, won't respond to remote or local controls
Low 5v standby supply due to diode D869 faulty, check by replacement