Hi. I have a Phillips 55PFL5601/F7 here with some problems that I can't pin-point the cause of.
Some history on the TV, it was brought in to me after it suffered a power surge/lightning strike. I was able to find both the power and the main board pretty cheap and for the sake of time, I went ahead and bought both. Replaced both the main board and the power supply board and the TV exhibits the same symptoms as it did with it's original boards:
1. No standby LED.
2. No display.
3. Voltages on the power supply side fluctuate wildly, not stable.
4. One of the transformers is making a buzzing sound every 1/2 second or so. "Buzz, buzz, buzz, buzz, buzz, buzz" - as soon as it's plugged into power.
I have done some minor troubleshooting steps already, like checking the fuses and trying to get some voltage readings on the pins, but as I said, they vary wildly so I can't get anything stable.
I have tried disconnecting (one at a time and testing after each one) everything except for the power and main board and of course the AC power cable. I did check and saw 121VAC from the wall outlet, just to make certain.
So being that both boards are exhibiting the same symptoms, what is going on? Could the two main cables between the two boards somehow cause this? What are the chances of receiving two ("new") boards that show the exact same symptoms?
Here are some photos for ya.
EDIT: I added a pic and circled the transformer that is making the "buzzing" sound every half second or so.
Some history on the TV, it was brought in to me after it suffered a power surge/lightning strike. I was able to find both the power and the main board pretty cheap and for the sake of time, I went ahead and bought both. Replaced both the main board and the power supply board and the TV exhibits the same symptoms as it did with it's original boards:
1. No standby LED.
2. No display.
3. Voltages on the power supply side fluctuate wildly, not stable.
4. One of the transformers is making a buzzing sound every 1/2 second or so. "Buzz, buzz, buzz, buzz, buzz, buzz" - as soon as it's plugged into power.
I have done some minor troubleshooting steps already, like checking the fuses and trying to get some voltage readings on the pins, but as I said, they vary wildly so I can't get anything stable.
I have tried disconnecting (one at a time and testing after each one) everything except for the power and main board and of course the AC power cable. I did check and saw 121VAC from the wall outlet, just to make certain.
So being that both boards are exhibiting the same symptoms, what is going on? Could the two main cables between the two boards somehow cause this? What are the chances of receiving two ("new") boards that show the exact same symptoms?
Here are some photos for ya.
EDIT: I added a pic and circled the transformer that is making the "buzzing" sound every half second or so.
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