Question about Sony KDE-50XS955 50 in. Plasma HDTV

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Fails to start up

When turned on the standby light goes out and the power light begins flashing as normal; however, the set often does not continue the power up sequence. The plasma does not light up and the audio never comes on. To get it to power up after such a start up failure the set is turned off and the A/C is disconnected for 30 seconds, reconnected and then the set starts as normal.

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Without being able to see the TV or take measurements when it does not turn on, my best "guess" would be the A2U board, which has most of the power supply components. This is only a guess, you really need a tech to take some measurements when it doesn't come on. I would like to get in touch with you to have you check some items using the original remote control. Do you have Yahoo messenger?

Posted on Nov 12, 2008

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Posted on Jan 02, 2017

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The self-diagnostic function of the projection television will cause the STANDBY light to blink or flash when the television detects an issue. The number of times the STANDBY light flashes corresponds to a specific issue, some of which you may be able to resolve without the need for service.
  • If the STANDBY light flashes three times in sequence, the lamp cover is not securely attached. Reattach the lamp cover to resolve this issue.
  • If the STANDBY light flashes four times in sequence, the television may be overheating. To resolve this issue, ensure that the back of the television is well ventilated.
NOTE: If the television will not turn on immediately after being turned off, wait for the fan to finish its cycle, then attempt to turn it on again. This is part of the cooling process of some projection televisions and is normal operation.
If the flash sequence is not listed above, or the light continues to flash after troubleshooting the indicated issue, follow the steps below to perform a power reset on the television:

  1. Turn off the television. IMPORTANT: For a projection television that uses an internal lamp, wait 5 minutes after turning off the television to allow the lamp to cool before continuing with the following steps.
  2. Unplug the television power cord from the electrical outlet.
  3. Let the television remain without power for 60 seconds.
  4. Plug the power cord back into the electrical outlet. NOTE: If the television is plugged into a power strip or surge protector, remove it from the power strip or surge protector and plug it directly into the wall outlet. If the issue is resolved, the problem is with the power strip or surge protector and not the television.
  5. Turn on the television.

If the issue is still unresolved after following all of the troubleshooting steps, service may be required. Please note the number of times the STANDBY light flashes and relay that information to the service center.

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According to the manual (you can see it here) page 122 that describes 3 red flashing lights:

"The lamp cover is not attached securely. When you secure the lamp cover, the POWER / STANDBY light flashes in red and the LCD projection TV enters the standby mode (see page22)"

Page 22 says:

"... if the POWER / STANDBY light flashes continuously, this may indicate the display unit needs servicing..."


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I hope this was at least a good starting point for you & good luck. Please rate my reply. Thank you.

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The self-diagnostic function of the projection TV will cause the STANDBY light to blink or flash when the television detects an issue. The number of times the STANDBY light flashes corresponds to a specific issue. As per the two examples below, some of the issues may be resolved without the need for service.
  • If the STANDBY light flashes three times in sequence, the lamp cover is not securely attached. Reattach the lamp cover to resolve this issue.
  • If the STANDBY light flashes four times in sequence, the TV may be overheating. To resolve this issue, ensure that the back of the TV is well ventilated.
If the flash sequence is not listed above or the light continues to flash, follow the steps below to perform a power reset:
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  2. Unplug the TV power cord from the electrical outlet.
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  5. Turn on the television. NOTE: If the TV does not turn on immediately, the fan may need to finish its cycle. This is part of the cooling process for some projection TVs and is normal operation. After the fan turns off, attempt to turn the TV on again.
If the issue is still unresolved after following all of the troubleshooting steps, service may be required . Please note the number of times the STANDBY light flashes and relay that information to the service center.

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