Question about Sony MOUNTED C. BOARD, SE-800 (A1097229A) Motherboard

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I cannot get the Sony VTX-760U to turn on/come off Standby. The switch is operrating down to the motherboard as i have used a multimeter to check but after that I am lost

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My Sony tv won't switch of standby just flashes


How many times do this standby light flashes at one time switch ON? Count this and make sure, how many times it blinks. These blinks are fault indications. From these number of blinks, you will get an idea about the faulty section circuit inside it. It will narrow down the troubleshooting. If you wish to get more details about Sony Blinking Codes; check this link.

Feb 17, 2013 | Televison & Video

2 Answers

Green LED on board is on but computer will not start


1) Check to see if the problem is the Power On switch, or the Power Supply, first.

Use a multimeter on the two wires coming from the Power On switch.
Perform a continuity test of the switch.

How?
An economical multimeter can be purchased, for as little as $8 to $12. Available in a multitude of stores. An auto parts store is but one example.

Make notes, and a drawing as to where those two wires go, on the Front panel header, on the motherboard. Then disconnect the two wires, and hold them in your hand.

Set the Function knob of the multimeter to OHM's. (1K, or 10K)
Touch the Positive (Red) probe lead of the multimeter to one wire.
Touch the Negative (Black) probe lead of the multimeter, to the other wire.
Press the Power On switch. (Button)

You should see a brief reading on the multimeter scale. (Or readout if the multimeter is digital)
It is brief because the Power On switch is a Momentary Contact Switch.

No reading? Bad ATX power on switch,

http://www.directron.com/atxswitch.html

Good reading? The Power Supply may be bad.
Test the three main voltages coming from the Power Supply.

[NOTE*
The Switched-Mode Power Supply, (SMPS), in your computer, is a power converter. It converts AC electricity from your home, or business, into three LOW DC voltages.

The shock hazard is IN the Power Supply's case. Not from the low DC voltages it produces ]

A) 3.3 Volt power rail
B) 5 Volt power rail
C) 12 Volt power rail

Test at the 20-pin ATX main power cable's connector,

http://usa.asus.com/Motherboards/AMD_Socket_754/K8VX_SE/

Photo, shows the white, long 20-pin ATX main power cable connector, on the motherboard. No power cable plugged in.
Two rows of 10 socket holes.
(Above the blue Heatsink that sits on the Northbridge chip )

This is a general example of a 20-pin ATX main power cable, and it's respective connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Power cable plugged in as shown in the right photo.
I suggest using a straightened out paper clip, and sticking it down in the socket for the power wire.
This is for the Positive (Red) probe lead of the multimeter, to touch to.

First voltage power wire check:
The multimeter function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line, over a solid line.
IF there is more than one DC Voltage scale, for the Function knob to be set to, set it to the 0 - 50 Volt scale.

The straightened out paperclip, will go down into the BACK of the 20-pin ATX main power cable's connector, RIGHT NEXT to the Orange wire.
Has to go down far enough, to go past the Orange insulation of the wire, and TOUCH the metal terminal down in the bottom.

[Looking at the middle photo, you can see the tips of the metal terminals I am referring to.
Uninstalled, and end not crimped over the wire's insulation, this is what they look like,

http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-US

Left side shown, crimps over the insulation of the wire.
The far right side is what you are seeing the tip of, in the middle photo of the Playtool link ]

You can use ANY of the Orange wires you see. ALL are 3.3 Volt wires.
The Negative (Black) probe lead of the Multimeter, touches ANY Black wire.
ALL Black wires are Ground wires.
(Straightened out paperclip, also goes down in the Black wire's socket hole )

Put the straightened out paperclips in the appropriate socket holes, then plug the Power Supply into power. Press the Power On button, and start the Power Supply.

On the DC scale of the multimeter you should be reading VERY close to 3.3 Volts.

Good?
Go to ANY Red wire. ALL Red wires are 5 Volts (DC)
Positive (Red) probe lead of multimeter to straightened out paper clip, down into a socket hole, with ANY red wire.

Negative (Black) probe lead of multimeter to straightened out paperclip, in ANY socket hole with a Black wire.
Reading should be VERY close to 5 Volts. (DC)

Good?
Go to ANY Yellow wire. ALL Yellow wires are 12 Volts. (DC)
Reading should be VERY close to 12 Volts. (11.5 to 12 Volts)

ANY low reading means a bad Power Supply.

Primer:
1) If ALL of the LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use 51 to 125 watts of power.

From your brief diagnoses it looks to be a bad Power Supply.
barely enough to light the green LED light on the motherboard.
Not enough power to even spin fans, much less turn the Processor on.

Power Supply checks out?
Perform a visual check of the Electrolytic Capacitors on the motherboard. Look CLOSE, and you may need a light, and magnifying glass.

http://www.capacitorlab.com/visible-failures/index.htm

Capacitors on the motherboard are used as Filters, and Voltage Regulators.
The one's used as voltage regulators, are in the motherboard voltage regulator circuit.
Some of the one's used in the motherboard voltage regulator circuit, regulate voltage for the Processor.

A Processor MUST have a steady, 'clean', supply of Voltage, and it MUST be kept within a very 'tight' tolerance range. Cannot be too much, or too little, or BIOS will not turn the Processor on.
(Or if on, will not keep it on)

That's an old motherboard. Could be bad capacitors, but I'm more willing to bet on a bad Power Supply.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jul 23, 2012 | ASUS K8V-X SE Motherboard

1 Answer

My 2006 VTX 1800c spec 3 has a problem with the head light, origanally my starter switch went out, but i fixed that but now my head light wont work at all, we have tested the bulb and fuses and we cant...


While the starterr switch was replaced it is possible that the headlight circuit was accidently tampered which had resulted in loss of voltage to the headlamp circuit. Now to trace this out you must use a multimeter to check the voltage+12 on the fuses of the headlamp. If this is not present then the wiring needs a check from the main junction, is not check the headlamp switch and the relay circuit . Both these are areas where a loss of the +12 will indicate a failure at the outputs.
You can also use a +12 park lamp as a test lamp with one side grounded and the other used as the test lead.

Oct 16, 2011 | 2006 Honda VTX 1800

1 Answer

When i switch on and then press for channel the standby light goes dull and tv does not come on. tried power down and trying again but no luck


There is probably a leaking diode or something that is overloading the power supply in the TV. I had recently fixed an HDTV in which the standby light was flashing on and off dimly but would not come on. I measured the standby voltage and it was only a little over 2V which should have been 5 volts. Then I checked to see if the standby circuit was switching ( they switch on and off at 100,000 times per second if operating). It would switch on then off the on then vice versa every fraction of a second and that indicates overloading. Sure enough i found a diode that was shorted almost completely. All semiconductor only let current to pass one way . These are diodes, transistors and chips. They are like electical one way valves and when they get messed up the leak untill current goes both ways and this causes a short which in turn overloads the system and cause shut down. You can try to learn how to test these device using a the diode feature in a digital multimeter.

Jun 26, 2010 | Goodmans GTVL32W27HDF 32 in. LCD TV

1 Answer

Motherboard red light stay on and computer won't turn on. Any ideas on what the promblem might be?


First try shutting down you're system. Than turn the PS off at the rocker switch (Back of PS). Ground you're self by touching the the PS. Remove you're memory and re-seat it. Than boot the system.
Check the standby LED. See if it lights green.
Pull the cmos battery and check its voltage. Anything under 2.4 volts replace the battery. Normally the MB LED displays green. (Standby power).
This means the MB is maintaining / charging the cmos battery. If the battery can no longer maintain charge this will cause the MB LED to turn Red. Built into the mother board is a small switch. When the system is shut down the MB maintains power to the cmos. If the standby switch fails to function correctly the LED will turn Red. Lets hope the problem is the cmos battery. The internal switch can not be repaired.

Cheers'
Mike

Feb 02, 2010 | AOpen S651M (918EM10S50) Motherboard

3 Answers

2005 vtx 1300 wont start and has no headlight


Check regulator...this powers all running light tail lights etc.

Sep 01, 2009 | 2004 Honda VTX 1300 Retro

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