TV will not power-up. I unplugged it from the DC power supply for 12 hours and then plugged it back up, and it worked for a day. I turned it off using the remote and it will not power-on. I unplugged it for 12 hours again, but this time it will not power up. Any suggestions?
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the first thing you can do is to unplug the tv unit not to used for an hour to discharge excessive voltage at the power supply board to reset the dc supply at the main board. then after an hour try to plug and turn it on. if still doesn't work at this time you will need to make a voltage checking if you know a basic electronics trouble shooting or you want a DIY just follow some of my steps by steps repair instructions.first you must need to check the output dc voltage at the power supply section, if their is an output which supply the whole circuit just be careful since you are dealing with some high voltage. the supply at the indicator light at the front is just only the stand by voltage. you will need to check the B+ voltage which around 110vdc at the horizontal section which turn on the whole circuit. you can used a digital tester to make a voltage checking just set to dc voltage. if their is no presence of 110v dc at the horizontal the vertical and the tuner section will not turn on. usually the cause problem like this is bad horizontal output transistor and an open resistance circuit going to transistor.check also for an open or defective resistor replaced it with same value.hope this can be helped just let me know if it works feel free to ask further solution thanks for using the fixya service good luck.
This is the basic guide that can be applied to most LCD flat panel TV.
First, try unplugging it from the outlet for about an hour to see if the TV will reset itself since the minute the TV is plugged into the wall, the power supply and processor will be running 24/7 and the EPROM can get corrupted by spikes and surges. Try using good quality surge suppressor to see if it will help if it happen often. Look for burnt brown hot spots on the circuit boards, capacitors with leaking/bulging top or seals. Loose wires and connectors. Blown fuses. Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.
1)The power supply module (There are 4 regulated output voltages:- Standby 5vdc, switched 5vdc, 12~16vdc, and 24vdc).
The power supply converts the 120/230vac 50/60Hz into DC, then the high frequency (50~100kHz) switching circuits convert it back to AC but at high frequency which allows the power supply to use smaller and much lighter weight transformers (Ferrite core instead of heavy iron core), then this high frequency AC voltage is fed to the rectifier Diodes to get the DC output and filtered by DC filter capacitors that must have low ESR (Equivalent Series Resistance), if general purpose electrolytic caps are use, they will fail within a year or less due to high ESR.
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). Common failures: Blown main AC fuse due to shorted out Diodes, transistors. Bad capacitors leaking or bulging tops: Shorted Diodes, transistors in the DC output side.
Tries tv unplug,replug it back like about an hour later.The tv now,it resetting itself back to the factory setting.The tv should work now,if not still have the same problems.The tv power supply board is the causes and the problems.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.
Lamp could still be going out they only last for 5,000 hrs some 8,000 playing hours.
Check the Lamp Fan if it stops running when Lamp turns on set will turn OFF.
But if you have never replaced Lamp Problem will be the Lamp Mats Has them for $99.00
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Yes,unplug,replug the tv an hour later.The tv should reset itself back to factory setting and work.Not,than the tv power supply board have problems.That the board,where the power a/c coard plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Tries the tv and cable box unplug,replug it back an hour later.Let the tv reset it self back to factory setting.The cable box upgrade it software.The tv should,work now.Not,than the tv power supply board have problems.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
How do the DC filter caps look? no bulging/leaking tops?
You need to verify the DC output of the 5vd and the 12~18 for the inverter, you will plug the power into the wall outlet and turn off the monitor using the power switch, check the DC voltage (The power supplies will be runing the minute the monitor is plug into the outlet and you do not want the inverter circuits to be running so you can check the DC with the inverter off and on to see if the DC ouput is steady. Please post back what you see.
Try tv unplug,replug it an hour later.The tv will now resetting back to factory setting.The tv should work now.Not,than the power supply board is dead.That the board,where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacenent.
The DM power supply board,probobally have those dying leakages gases about to be dead parts call capacitors.U have tools and know basic soldering?Tries website like Tvrepairworld.com to buy a capacitors kit,to replaced those dying capacitors belong in the DM power supply board.
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