Sony Bravia 46EX400 won't turn on at all


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Sony Bravia 46EX400 won't turn on at all

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Wagstaff
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Aug 23, 2013, 5:44 PM

Post #1 of 4 (15057 views)
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Sony Bravia 46EX400 won't turn on at all	Can't Post

Hi guys,

The TV is just over 3 years old. Normally when plugged in, there is a red LED on the bottom of the TV, and when it gets powered on it goes green. Now there is no light at all. When I plug the TV in or unplug it, it makes the "click" sound like it sounds like it's turning on or off, but nothing happens. What should I do? Is there any easy "checks"? I found the service manual online and it seems all the self-diagnosis is either on the screen or based on the blinking led, which doesn't get power. I think since the LED doesn't even get power, the problem lies within the power board. So it shouldn't be TOO hard to fix, if I can figure out exactly what needs to be replaced. What exactly can I do, should I just call Sony? I can open up the TV and check voltages, but I suspect they will all be 0 as I don't think it's getting power.

Thanks

jts1957
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Aug 23, 2013, 10:24 PM

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Re: [Wagstaff] Sony Bravia 46EX400 won't turn on at all [In reply to]	Can't Post

Training Manual CTV-61 has power supply description and troubleshooting.

Available at elektrotanya

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vista1992
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Sep 8, 2013, 7:37 PM

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Re: [Wagstaff] Sony Bravia 46EX400 won't turn on at all [In reply to]	Can't Post

you can check if the fuse is blown, which is an easy check or for burn marks and capacitor bulging.

jts1957
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Sep 8, 2013, 8:44 PM

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Re: [Wagstaff] Sony Bravia 46EX400 won't turn on at all [In reply to]	Can't Post

No Power/Dead Set (No RED Standby LED)
In a dead set condition there will be No RED Standby LED illumination in the Standby Mode (TV plugged into an active AC Outlet).
The following bullet list gives the possible failures for a “No Power/Dead Set” condition.
• Loss of AC Power
• Loss of AC-OFF-DET
• Loss of Standby 3.3Vdc
• Loss of REG12V
• Loss of Power-On
• Defective Main Microprocessor
The first step in troubleshooting a “No Power/Dead Set” condition is to confirm that 110ACV power from an active AC outlet is applied to the G2LE-Board, G2LE-Baord, or GD2-Board. AC power is applied to, and can be measured at CN6101 on the G2BE-Board or G2CE-Board and at CN6003 on the GD2-Board.
Next, check for the presence of the AC-OFF-DET voltage at CN6401/pin 2 or CN6150/pin 2. If the AC-OFF-DET circuit is working properly 3V should be measured. If the 3V is not present replace the G2BE-Board, G2CE-Board, or GD2-Board. If the 3V in not present either the main fuse or the main power supply IC6501 is defective. In either case, replace the power supply board.
After confirming the AC power and AC-OFF-DET, check for a defective Standby 3.3Vdc power supply IC6201. To confirm a defective IC6201 check the 3.3V secondary voltage at CN6401/pin 1 or CN6150/pin 1. As long as AC power is applied to the TV IC6201 should be active and outputting 3.3Vdc. If the 3.3V is not present then IC6201 is defective. Replacing the power supply board will fix the problem.
Finally, a “Dead Set” condition can be caused by a defective microprocessor IC400. The microprocessor outputs the Power-On signal which activates the switch Q6301 and IC6301 on the power supply board and passes the 19V from the Standby power supply to active the relay (46” models), PFC, and Main Power Supply IC6501. If the Power-On signal is not output after receiving the Power-ON command the power supply board circuits remain inactive and a “Dead Set” condition exists. The Power-On signal can be checked at CN6401/pin 3 or CN6150/pin 3. It should measure approximately 3.3Vdc If the measurement is 0Vdc before shut-off the TV microprocessor is defective. Replace the A-Board. If the power-on voltage is 3V before shutdown then the switch circuit on the power supply board is defective. Replace the power supply board.

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