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Anthony_Infotech, Technician
Category: TV
Satisfied Customers: 14678
Experience:  20+ years experience TV expert (field and bench) 9 approved qualifications in TV-ELECTRONICS
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What voltages can I check on my FSP285-3PS03 power supply to

Customer Question

What voltages can I check on my FSP285-3PS03 power supply to see if it is the problem with my TV? All the 12V signals seem OK, what should the high voltage be?
Submitted: 2 years ago.
Category: TV
Expert:  Anthony_Infotech replied 2 years ago.
Hello and Welcome
Thank You for the Question
My name is Anthony
Just a little info so you understand clearly how this works.
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Customer: replied 2 years ago.
TV had been acting up (not turning on, screen going blank). I have pulled the power supply (a FSP285-3PS03). I was able to check the low voltage (12V signals). What should the high volt signals be?
Expert:  Anthony_Infotech replied 2 years ago.
There are no high voltages on the powerboard in an LCD set particularly a modern LCD set.
You have the powerlight lit as normal so the powerboard is very likely to be OK.
You need to replace the mainboard thats the one with all the AV connectors attached as its likely to be either bad firmware or a hardware issue associated with that board do you think you can do this work?
Customer: replied 2 years ago.
Is there a way for me to verify the main board before buying a new one? Can I update the firmware somehow?
Customer: replied 2 years ago.
The board I indicated has a connection label High Voltage, it had a connector on it.
Expert:  Anthony_Infotech replied 2 years ago.
Yes it may be a combined inverter powerboard the inverter section will have high voltages but they dont get going until the powerboard itself is running and are not relevant if you take a photo of the complete board also please let me know the model number found on the back of the set
Customer: replied 2 years ago.
Expert:  Anthony_Infotech replied 2 years ago.
Yes its a combi board that high voltage is for the back-lights it has no bearing on this issue, the plug at the top of the powerboard will have a standby 5v dc supply if the board is producing that and other voltages its working OK the mainboard is bad
You need to get the back off the set, locate the mainboard thats the one with all the AV connectors on, unplug and unscrew the board from the chassis, remove the board ,carefully examine the board for its part number usually found on a sticky label on the board or etched on the board, (you may need to go through a few codes before you find the right number)when you get the partnumber try first, if they dont have it google the partnumber to locate a supplier, its the reverse to fit plug in and switch on TV (plug and play)
The reason why its important to use the partnumber is ***** there may be variants of the board in the same model and they are not interchangeable
Let me know if you need more info
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