Question about Sony KDSR50XBR1 50" Projection HDTV

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SONY XBR1 SXRD

Hi I have the same problem with the 4 red lights flashing... did you fix your tv and if so what was the problem?

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  • tom sh May 23, 2008

    Red Power/Standby flashes continuously 4 times. The fan in the back is NOT on.

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I get the same problem (4 flashing red lights).
I done some internet troubleshooting and narrowed it down to an overheated power circuit card/fan issue.

It turns out one of the fans is failing and will not rotate at the appropriate speed to cool the power circuit card, this will kick out the 4 flashing lights from the diagnostics.

In lieu of replacing the fans I have a temporary solution:
For my TV (kdsr50xbr1) the fan in question is located on the far left side (facing the rear). You will see a grill on the back of the TV showing you where the fan is located.

First, get a can of compressed air and blow it into every fan. This will clear away a lot of dust and help the fans move easier.
There is one blower type fan located inside the TV, remove the back panel and look for a tall yellow circuit card just to the left off the center of the TV. Behind that card is a blower (stands upright looks like a tube). Blow air into that blower, you will see a lot of dust come through the duct and out where the large fan in the center is located.
Put everything back together. and provided the fans aren't too far gone the TV should be working again.

Also, if the issue comes back, try this:
When you turn on the TV, shoot a short squirt of compressed air into the fan (Far left facing the rear). This will give it a kick start and bring it up to speed.

It is important to note that the compressed air cans do contain a liquid and as such are not compatible with electronics when they are plugged in. Try your hardest to keep the can upright and not allow the liquid to squirt out where it shouldn't. If it does it will evaporate in a few seconds.

Ok, relatively long post, to summarize:

1. Open back of TV, blow compressed air into every fan to clean them.
2. Blow air into whichever fan is causing problem if it happens again.
3. Keep the can upright if the TV is still plugged in. Don't sue me if you fry your TV.
4. If this doesn't work (has for me) replace fans

Posted on Jun 19, 2008

I just took that 120mm fan apart and cleaned it... Now it has been working fine for the past three months.

Posted on Jun 19, 2008

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Light bulb mine just did the same thing last week. ordered the bulb only $129. from bluestar-online.com

Posted on Mar 27, 2008

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Posted on Jan 02, 2017

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Televisions have protection circuits which prevent full power-on if a fault is detected in a high voltage/high current circuit such as the backlight inverter.

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Sony KDSR50XBR1 50 black screen, no faults! Lamp working, fans OK Sony KDSR50XBR1 50" HDTV: The light engine was working fine before the fan quit starting on it's own. After disassembly, cleaning and lubrication of the fan, I have no errors but the input display or menu options will not post on the screen. The lamp is on but seems to either be projecting a solid black picture, or not be at full brightness and there are no faults. I have a solid greed LED on top, but can get no picture. Sound is fine. What should the lamp voltage be at operating mode? I have tried reseating connectors and pushing on the wires to make sure the connectors seat. This is baffelling because the lamp fired fine for 1 second before the stuck fan issue was corrected and I have no faults now after lubricating the fan. I'm going to check connectors again today as a triple check; as I did remove the power supply. The TV has been reset per instructions in the book. Any advice would be much appreciated but I cannot believe it's the OB as it worked fine before the fan quit and it's about 14 months old. I'm thinking something may not be assembeled correctly, but everthing seems to be pretty idiot proof for re-assembly. Also the menu or input banners will not post. I have 2 new lamps, so it's not that.It seems to be stuck in somne black screen mode. The large fan does start by itself now after cleaning and lubrication, therefore no fault blinks. Please help!!!

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