New power board flashs 4 times what is the code for
SOURCE: Red Light on Board
it is better to use the old power supply because it is compatible to your mother board
SOURCE: power supply board led green light blinks 3 times.
vscan is a voltage used to setup the picture for the panal. It goes to the y sus board. The problem is at the power supply or the y sus board. You can check these with a meter.
SOURCE: TV does not turn on/red led flashes 7 times in front
this is common issue with this model and through your troubleshooting is tied to y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards
SOURCE: Philips 42PF7220A/37 Chassis Number BP2.3U
I think its something on the picture frame board or on the line output board. I would sway to the line output simply because I think but not sure that error code is linked to the line output stage plus when you unplugged the cable the voltage seems within parameters. Good luck.
SOURCE: Philips 42PF7220A/37 April 2006. Chassis Number BP2.3U
Most likely the YSCAN UPPER board and/or YSCAN LOWER Board also gone. Your new YSUS board may damage again if you don't replace the bad YSCAN boards. Try to replace the three boards together and then to verify which boards are bad one by one. Good luck.
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