Question about Panasonic TC-32LX300 32 in. LCD Television

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When press power button the red (power on) led comes on but no picture or sound. I do measure various voltages in the power supply using the tuner as reference. Also I don't see any swollen caps. Feel like the power supply is working but not sure how many voltages leave it. Any ideas?

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Please read my guide to understand more on how LCD TV works, it sounds like the 12/24vdc power supply are not turn on.
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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Stand by is on the power board but it is possible for standby to be up and running and main supply not working. Did you look for bad caps on power board or any voltages coming out of that board?

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Close examination of your power supply may reveal if the psu is bad.

When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.

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See if the fan inside the psu is working if not then its a clear indication of a bad psu.

Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.

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Power Issue


Now,u plug in the tv u get a solid red standby power red LED light in the front of the LCD panel right?When u push the power button on the remote u hear a clicking sound?Only one clicking sound,not the power supply board problems.It the Tuner board problems.But u can make sure it the power board problems or not.By taking the tv aparts check the power board,that board where the a/c power cord goes into it.Look all around the power supply board check for these leakage capacitors,they alway bulges up it top or puff up it top.No bad leakage capacitors,then it not the power supply board problems.

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Check the PTC parts,the primary AC power supply board.Disconnect the power supply board,measurement the capacitors and power tranzistors,measurement the output voltage(155V),connect on the output on 60W electric bulb,if it light the power source is ok and the problem in the horizontal driver parts(trafo,power tranzistor...).

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Look on the power supply for a plug that has an id of voltages, you'll see one that says PO, that means power on, to kick the power supply up. Put you DVM on that pin and press the power button and watch the meter, you should have high activity, if it comes up to lets say 3.4 volts and falls off then the main board needs replaced. Let me know how you do!

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If the power supply outputs are good! Then I would say the back light inverter is bad! If the screen stays black and does not come on.

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Power up then off, no picture, blinking red LED


The high voltage does come up but the set goes into shutdown because is sensing a problem somewhere in the set,the shutdown circuit gets activated when the high voltage is too high, a problem in the horizontal deflection circuit or because there is a problem in the secondary of the output transformer,this transformer helps develop voltages supplies and if one is missing the set senses the problem and shutsdown,there is another possibility and is related to the picture tube,there is a resistor in the crt board ,it should measure 51 ohms only ,sometimes it opens up and gives you same symptom.If you are familiar with tv service you can check this resistor and be alert of the other possibilities,if you are not too familiar be safe and get assistance from a servicer. Let Us know how it goes,or if you need more information.

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