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Hisense TL2020 LCD TV

I have 12 volts going to the voltage inverter board coming from the main board until I plug the connector into the inverter board. Then, it drops to about 5 volts. If I connect an external 12 volt 1 amp DC adapter to the 12 volt lead, the voltage comes up to almost 10 volts and I can see the picture good. There is no sign of any burned components and all other voltages look fine. Any help would be appreciated. Thank you very much
Frank

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You should check the 12 volts capacitors on your power supply for dry or leaky, bulging conditions.
Replacing those capacitors will restore the functionality of your TV.

Posted on May 15, 2008

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Vizio TV model E470i-AO with no backlights, was able to see the menu and run netflix with a flashlight and hear sound. Do you think is the power supply or the actual backlights?


Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Feb 18, 2016 | Vizio Flat Panel Televisions

1 Answer

What makes the HISENSE LCD (Model LCD 42W58P1) power supply failed to produce output voltage goes to the main pc board?


Hi,
First of all the power supply makes 'Stand By 5 or 3.5V which goes to main board. When we give power on command to the TV the main board sends 'stand by or Power ON' command to the power board which then makes other necessary voltage for the main board as well as other sections. If the power board does not receive 'Power On' command from main board, it will not produce the necessary voltages to operate the TV set.

May 20, 2015 | Hisense Flat Panel Televisions

1 Answer

TV turns on and off immediately after??


well the problem its the main board see your tv has 2 boards the power supply and the main one that its incharged of the picture and all your imputs tll you this have the same pro with my element tv made by hisense call them they sell it to me for149 but one of them told me to go to shopjimmy.com hey better price found it for 98.10 plus shipp 108 and got the info of what was causing it from the tv repair guy but he was charging too much just to fix the old board

Apr 13, 2010 | Hisense LCD1504 15 in. Television

4 Answers

Westinghouse HDTV TX42F430S, No picture or sound.


From where do you get the 3 volts to feed the master inverter board?
Have you measure all the voltages from the power supply to the main board?
Since the screen is ON when applying the 3.3 volts and the CCFL lights are ON, the backlight inverter boards and the CCFL lights are working. At this point there could be a LCD controller inverter board failure but if that is the case, you could still have audio but no video.
I have the module from a TX47F430S that had a broken screen, the 42 and 47 inches use the same parts.
Let me know if you need further assistance.

Mar 17, 2010 | Westinghouse TX-42F430S Television

1 Answer

Hisense TL2020 just locked screen and now won't unlock....


try opening the back, first remove the stand, unplug all the wire connectors to the circuit boards., wait and then replug all the wire connectors circuit boards. it may or may not work.

Dec 19, 2009 | Hisense TL1700 17 in. LCD Television

3 Answers

Will not turn on i replace the power supply and the same. should i be getting 24volt and 12 volt reading from power supply.or is there something i need to do to turn that part of the suppy on.


You should be getting the same reading of voltage from the power supply as it is rated on the case of the supply. There should be a output rating the the cas of the supply and whatever reading you are getting should be within 1 volt. If you replaced the power supply and this one is testing at the right voltage then the problem is within the television.

Oct 07, 2009 | Vizio VW46LFHDTV10A 46 in. LCD TV

2 Answers

Same problem. red light flashes 3 times, but will not turn on.


Hi,

The blinking light means the controller QA01 in the AV_TERM system board is booting and driving the TIMER/REC RED LED light accordingly. This failure mode is true for many conditions, not exclusively for the main PS board PE0071. It could be caused by many things, LOW B, SEINE, AV_TERM, LCD, PROTECT, etc.

Specifically for PE0071+12VDC circuit failure, which is the most common , listen for the LINE relays SR80, SR81 coming online. If several (3) or more clicks are present when applying power to the TV set then suspect the +12, 20, +32 VDC inverter is faulty.

As a quick check, you can disconnect P807B. If the relays cycle every 1-2 seconds then is most definitely the +12VDC inverter. Check for voltage level at optocoupler Q881 pin 4 and this should not be cycling. This point is the VCC for the oscillator. Repair or replace board 75002913 as necessary.

TROUBLESHOOTING: (this is my own, not the OEM !, try at your own risk!)

  1. Check for LINE1 input voltage level at inverter on sheet [4].
  2. Check for LINE2 input voltage level at inverter on sheet [3].
  3. Check for STBY +5VDC & +25 VDC ( observe correct GND REF) page [4]of PE0071 POWER
  4. Check for +22 VDC out of regulator on page [3] out of Q822 Emitter
  5. Check P809B connector for :
  • P809B (12) POWER = 3.00 VDC (+/-0.2)
  • P809B (11) POWER_SIG = 0.00 VDC (HIGH to Power on TV)
  • P809B (10) PROTECT = 0.00 VDC
  • P809B (9) ACDETECT = 3.00 VDC (+/-0.2)
  1. Check for PFC_OUT = 368-371 VDC
  2. Check for +12, +20 & +32 VDC inverter page [5] of schematic manual.

For +12 VDC Inverter, suspect components:

Q880 STR-W6765 PSR (works really hot!!)
C888-C890
D884A and related switching circuit components.

Good luck,

mrwindex

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1 Answer

The sound doesn't come on with the TV.


sounds like a capacitor problem, they sometimes dont work cold but work ok when they are warmed up. i would not recommend anyone unfamiliar with tv repair and its safety procedures open up a tv set because of the lethal voltages present inside, even when unplugged it can hold a charge for months.

Mar 23, 2009 | Flat Panel Televisions

1 Answer

Low voltage on voltage inverter board


Probley got a week capacitor in the 12 volt supply, but without even a make or model number your guess is as good as mine

May 15, 2008 | Flat Panel Televisions

2 Answers

Hisense TL2020 TV repairing


To unlock your Tl2020 with a universal remote just go into the menu and select V chip setting. The password from the factory is four zeros (0 0 0 0 ). Once you get in you will the letter "B" nect to everything. Set everything to the letter "U". Then, turn off the television. The set should be unlocked now. Good luck !
Frank

Sep 15, 2007 | Hisense TL1700 17 in. LCD Television

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