Facing TV Problems? Ask a TV Technician.
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The 250V is the AC Input- the board will always have that present unless the mains fuse is dead. it's the DC outputs on the board that are more important to check offhand. That said, are you saying you installed a new power supply board, and still have no standby light?
Okay this means you have a bad Mainboard- and the power board is find. The mainboard produces the standby light and allows the power supply board to engage with a turn on command once the power button is pressed. The mainboard is the one with the AV jacks located on it and is the central processor for the TV. So you would need to replace the Mainboard for these symptoms.
I am not sending that phone call offer- you can ignore it.
You have a spare mainboard?
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Hello, I'm Shahid. Sorry to hear that you're having trouble with this but I'll do my best to help.
OK, I'm working on it, give me 5 minutes please.
Please find CN6150 or CN6156 connector on power supply board and check Standby 3.3V DC at pin-7 of that connector while TV power cord is plugged in.
What readings appear on meter?
Pin-1 would be marked with little arrow or number or STB3.3V would be stamped near pin-7
No problem, meter should show 3.3V DC reading, do you get that?
It should be exactly 3.3V DC.
Is the meter being used tested and working?
Another way is to disconnect harness plugged in that connector and test STB volts again, without load.
Do you still get 2.8V?
Please touch the meter black lead to GND point of power supply board and use red lead to measure STB volts at pin-7 while TV power cord is plugged in working power outlet.
If power board is OK then you should get 3.3V DC reading.
I understand and trying to troubleshoot the problem. You should have 3.3V reading no matter if board is old or new.
3.3V standby volts is must to wake up the main controller chip on main board to get standby light On and main power section will turn On when you press power button on TV or its remote.
2.8V is insufficient for main controller chip that is why you don't get any response from TV.
Do you have old power supply board and can install it in TV?
Also, confirm your multimeter to make sure it is showing correct readings, test a battery volts that should be 1.2V DC reading.
Let me explain, standby section works as soon as you plug TV power cord in so you will get standby 3.3V output instantly that goes to main board to wake it up and it will send Power On command to power board to switch On main power section so the other boards and sections get required volts and you get picture and sound on TV.
Now even if you disconnect power supply board from main board of TV and plug power cord in, standby volts must be available. If it doesn't happen the power board is faulty either it is new or old.
I hope these info will help to confirm the power supply board.
Have you tried old power board in TV as requested in previous reply?
No problem, we can continue it at later time.
Please take out a battery cell from a remote and test DC volt of it to confirm the meter.
250V are AC volts which is main power supply coming to house and we are testing DC volts of standby with meter so meter should be set on DC Volt range to check 3.3V
OK, we will discuss it by tomorrow, please message me here when available and give me little time to respond as I might be offline at that time.
Sorry to hear that, your new power board is defective, please return it and ask for another power board that should give 3.3V STB reading.
OK, we need to verify voltmeter first then confirm the standby 3.3V output to make any decision.
Do you need any further assistance with this question?
No problem, please make sure you're getting identical board as replacement.