Question about TruTech PLV16320 Television
IF the backlights are on but you just get dim glowing on the screen when look at the screen in darkened room then the T-CON board is bad or it is not getting the 12vdc from the main logic board. Need to use logical troubleshooting before buying the wrong parts.
ALSO NOTE THAT
The power supply has Standby 5vdc (5VSB, this is a MUST have before anything else will work, when this voltage is not present, there will be no any indicator light on the front panel) which is always on the minute the TV is plugged into the AC outlet, so it is on 24/7 and that is why the power supply will fail even though you may use the a TV not very often. It will see all the voltage spikes and surges 24/7.
This 5vdc is used to power the Processor and the Infrared remote receiver module which will be waiting for the command from the remote control or from the power switch, when the Power on command is received, the Processor will send the turn on signal (3.3~5vdc) to the power supply module (PSON pin) to the switch on the main 5vdc for the rest of the logic and Tuner circuits, 12~16vdc for the sound amplifiers (mostly Class D amplifier for efficiency and small size) and for the T-CON board (interface board between the LCD panel and the Logic board), and 24vdc for the Back lights inverter board (if there is no 24vdc then no back light).
Blown main AC fuse due to shorted out Diodes, transistors.
Bad capacitors leaking or bulging tops:
Shorted Diodes, transistors in the DC output side.
Hope this helpout
Posted on Jul 07, 2010
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Posted on Jan 02, 2017
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