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Assuming you have a bad fan the answer is get an estimate as some sets have several fans and some are harder to get at than others--Ballpark? 100 to 150 parts and labor and depends on how set is assembled.
The service manual lists 4 blinks as "Fan Stopped".
Probable cause is - "Fan 1-4 power is not supplied. (AGU board)
- "Fan connector is not attached securely."
- :Fan caught wires or harnesses.
I had this problem recently and I was able to clean it up and get it running again.
the exhasut fan is most likely the culprit. it is the fan directly on the back of the tv on the side that the lamp goes into the tv. u can get a flashlight and look back throught the vent to see if it is spinning after you turn the tv on before it goes into shutdown. if you can get a screwdriver in the slot to spin the fan qucikly after power up it may start again but will most likely just be quick fix and fail again soon. the fan is a 120mm fan part number SFF21C best to get them from sony or at least under sony part number.
If you are positive that the fan is still running and that it isn't an over heating issue, I would venture to say you need a new dlp lamp. Your model uses a Sony XL 5100 dlp lamp. You can grab one over at DLPLamps.com.
Try to access the self-diagnosis screen. With the TV off, push in sucession, the "mute, then the number "5" button, and then the volume down button, and finally the pwer button. When the picture comes on, there will be a list of different circuits and to the right are numbers which represent how many times that particular circuit had a malfunction. Sometimes the red blinking LED code is itself in error, so this may help to clarify the root cause of your problem. Now, if the TV will not stay on long enough to perform the previous operation, you should consider replacing the large exhaust fan that is in front of the lamp assy. This has been the problem fan in these sets.
I have the same problem and this is caused by one of the fans not coming on when the TV boots up. If you look behind the TV you can see two of the fans without even removing the cover. The one on the left is a large fan that cools the bulb. This is the one that has died on mine. If I CAREFULLY stick a small screwdriver through the fan grate on the back I can give the fan a nudge and it will start up. Then the TV comes on OK. If you have extended coverage then you should be fine - but if they tell you the part is not covered - it should be easy to replace the fan. The problem is finding one. I found one place that sells it for about $25 but they have no pictures - so I am not sure which is the right fan. Let me know how you made out with the repair guy.