Hello and thank you in advance for taking the time to read and reply to this post.
I was recently given a Toshiba TV that won't turn on.
TV Model 46XV540U
Power system is conformed by 2 power boards interconnected.
Bigger power board model#: PE0564
Smaller power board model #: PE0563
Symptoms:
- While connected to a good know power 120v source, and trying to turn it on, there is no image, no output sound from the speakers.
- There is a clicking sound once you press the power button just once every time you try to turn it on.
Troubleshooting steps done so far:
- Used a flashlight on the screen and there is no image showing.
- Tested voltage in main connector that goes to main board, the 5v (possible stand by is present, no fluctuation).
- There is a green led on main board that acts as a stand by led, turns on when I try to power on the TV and stays on until I try to power it off.
- Tested all visible fuses.
- Tested DC voltages in bridge rectifier D820, only 5-6 volts DC.
- Tested AC input voltages in bridge rectifier, no voltage going in.
- Tested Fused Resistors R897 and R898 on PE0563 board and both are good.
- Tested fused resistor R850 on PE0564 board and there was no continuity and 0L (open loop) when testing resistance ohms.
- Removed R850 fused resistor and tested it out of the circuit, same results.
- Already ordered replacement for this resistor.
My question is, whatever blew this fused resistor may still be bad and the same thing can happen once the replacement is placed back in the circuit.
Any ideas on what should I test next?
I'm no electronics expert, just have very basic knowledge but I'm eager to continue learning.
Once again, thank you very much for any help and tips.
I was recently given a Toshiba TV that won't turn on.
TV Model 46XV540U
Power system is conformed by 2 power boards interconnected.
Bigger power board model#: PE0564
Smaller power board model #: PE0563
Symptoms:
- While connected to a good know power 120v source, and trying to turn it on, there is no image, no output sound from the speakers.
- There is a clicking sound once you press the power button just once every time you try to turn it on.
Troubleshooting steps done so far:
- Used a flashlight on the screen and there is no image showing.
- Tested voltage in main connector that goes to main board, the 5v (possible stand by is present, no fluctuation).
- There is a green led on main board that acts as a stand by led, turns on when I try to power on the TV and stays on until I try to power it off.
- Tested all visible fuses.
- Tested DC voltages in bridge rectifier D820, only 5-6 volts DC.
- Tested AC input voltages in bridge rectifier, no voltage going in.
- Tested Fused Resistors R897 and R898 on PE0563 board and both are good.
- Tested fused resistor R850 on PE0564 board and there was no continuity and 0L (open loop) when testing resistance ohms.
- Removed R850 fused resistor and tested it out of the circuit, same results.
- Already ordered replacement for this resistor.
My question is, whatever blew this fused resistor may still be bad and the same thing can happen once the replacement is placed back in the circuit.
Any ideas on what should I test next?
I'm no electronics expert, just have very basic knowledge but I'm eager to continue learning.
Once again, thank you very much for any help and tips.
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