Question about Televison & Video
I can add more details just trying to figure if my set is dead or is it the power supply or buffer boards/y sustain boards and I am getting my standby voltage
Posted by Anonymous on
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Posted on Jan 02, 2017
most probably is (a) board ..very common on these models.These boards are made by RoHM.These are similar and used in maganvox,philips and others..Very common breakdown
Posted on Nov 30, 2007
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.
Posted on Jan 05, 2009
SOURCE: p50hdtv10a y-sustain and pcb
I had this problem with a different brand plasma and it turned out to be cracked or missing solder on the power board lead to y sustain. I removed the power board, desoldered the connection, clean it up and then resoldered the connection. Everything works great now.
Posted on Sep 27, 2009
As such boards are cheap and fail quite easily (both the two sustain and the buffers) Philips service manuals are more oriented at board swapping then at proper testing. In this particular case the buffer boards fail very easily because of a bad soldering to IC. The short will regularly blow the main sustain board.
To start when a main sustain (e.g. Ysus) is fried the TV will go in protect mode with the led flashing in standby. One test is done disconnecting the Sus board (with power off) and restarting the TV. If TV does not go in protect, then the sustain board was good.
If there is no protection:
The first thing to check on a main sustain board is the fuse. If the fuse has blown the IC is probably fried.I believe fuse is F5004. Check for swollen capacitors that may have blown. Test the FET. That is the core of the board as it is the power amplifier.
Here the service manual:PHILIPS_SM_15540.pdf - Right Click "Save Target As"
Here a more useful service manual. Check and follow troubleshooting diagrams in manual.
Here some troubleshooting from users.
Note:if buffer board was shorted, then the main sustain board is usually faulty.
Posted on Sep 13, 2011
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