Question about Vizio VU42L 42 in. LCD TV

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3 y/o Visio VU42L with no pix or sound

I checked all connections and the P/S 5, 12 & 24 Vdc supplies seem to be fine. Both Inverter boards are humming as normal. The power sw works to turn the unit on and the main relay clicks it in but said sw won't turn it off and the remote does neither. All the transistors on the board seem to measure as normal with a diode checker and the heat sink rails run at ~160VDC. The LED back light glows as normal. Any other troubleshoting tips will be appreciated.

Thanks,
Michael

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Well,mike seems youve done everything to your TV and nothing happen..Try to reset the system of your TV.On the main board there is a small button just press it to reset your system and see if your TV will work again tnx.

i hope i help you..
please rate my help...

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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I have LG 42LN5300 which is reading 230VDC at led + plug and no back lights. All other voltages going to main board are OK, I changed main board because of flickering on and off screen, so is it MB


Back - light problem. 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/
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.

Jan 20, 2017 | LG Televison & Video

1 Answer

Which board is bad?


Back - light problem. 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://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.

Oct 15, 2015 | Televison & Video

2 Answers

Lg lcd 42lg3 tv was working last night got up this morning power goes on but no picture or sound


Check the power supply module to make sure it has all the outputs, it sounds like thge 12vdc and the 24vdc are not on, it can be that it is not receicing the PS_ON signal from the main board or there is short circuits in the backlight inverter board that will cause the power supply (12 & 24vdc to go into shutdown mode), you can try disconnecting the power cables to the inverter board to see if the 12 & 24 vdc will come back on.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

Please post back what you find.

Aug 02, 2010 | Televison & Video

2 Answers

My tv picture goes out after 1 min after I turn it on. what is the problem?


u have 2 options, chech ur power modoule for faulty filter capacitors & replace them & if power ok check ur inverter with another tft lamp to dignose b/w the inverter & the lamp

Jun 15, 2010 | Westinghouse LTV-32w4 32.02 in. LCD HDTV

1 Answer

The screen went blank and the tv will cut on but shows black screen only


Look to see if you do have 16~24 vdc feeding the backlight inverter board, check the power supply section for caps with leaking/bulging tops. So it can be the power supply or he backlight inverter board.
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Jun 14, 2010 | Audiovox FPE2306 23 in. LCD Television

2 Answers

Tv goes black but you can hear the sound


You need to find out if you do have 24vdc output in the power supply to feed the back light inverter board first to find out if the problem is in the power supply or the inverter board, if you do have 24vdc, then you need to check the inverter board to see if the 24 vdc reaches the inverter board, also check the fuses on the inverter board.
Parts: http://www.shopjimmy.com/catalogsearch/result/?q=Insignia+IS-LCDTV32+

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Jun 12, 2010 | Insignia IS-LCDTV32 32 in. Television

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

Jul 03, 2009 | Toshiba 42HL196 42 in. LCD HDTV

2 Answers

Vizio 42" lcd powers up with sound only - no picture


It sounds to me that the unit has a faulty inverter board which could be due to an overheated/bulged capacitor. I would send in a claim on it to the factory if it is still under warranty.

May 28, 2009 | Vizio VU42L 42 in. LCD TV

2 Answers

Tv does not turn on. Makes ticking clock sound ?


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.(ticking clock sound) 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

Mar 12, 2009 | Toshiba 42HL196 42 in. LCD HDTV

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