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No power, suspect main board problem. - Compaq Computers & Internet

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Change your SMPS alsomcheck your main power suply and earthing problem.

Posted on Oct 25, 2008


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My LG47LN5400-UA will not power on. I have no audio or video. The power board output voltages 3.3-12 and 24 volts from the power supply onto the Main board are right on and steady.

Try to check the supply of power board, the 3.3 is not correct it must be at 5 volts or 5.5 volts maximum. the 3.3v cannot sustain the standby power on.

Dec 13, 2017 | Televison & Video

1 Answer

LG LED TV. 50LN5700UH. Picture out. It will flash LG Logo on power up then go black. Image is present by flashlight test. Audio is also present. Power LED is also lit.

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.
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 02, 2017 | LG Televison & Video

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Just put in new power supply board .was working maybe 10 minutes and it went out. Power supply does turn on and off with remote. What could be the problem?

possible inverter board bad or bad main board.
disconnect inverter board and see if set comes on..if it does then inverter board is bad..if it does not then suspect main board.

Jul 03, 2014 | Polaroid FLM-3734B 37 in. LCD HDTV

1 Answer

Sylbania LC427SSX Power comes on and light goes to solid green but, have no picture.

if the audio works then the inverter board would be suspect. If audio doesnt work either then the main board would be suspect. You can get replacement boards from

Feb 08, 2013 | Sylvania LC420SS8 LCD TV

1 Answer

32" emerson tv

I would suspect the power supply first Most likely bad capacitors. The main board would be suspect next as the power on command comes from the main board which switches on the run supplies.

Oct 29, 2012 | Emerson Lc320em1f TV

1 Answer

Lc 70le633u light flash can not power up

Does it have a standby light? If standby light is visible main fuse is likely ok, Suspect bad power supply check capacitors for swelling on the power board, if not, suspect main board.

Aug 13, 2012 | Sharp Televison & Video

2 Answers

Zenith z50pg10 its dead no click, no led blink nothing !

Zenith Flat panel TVs usually only have two boards in them Plasmas have a few more, doing a visual inspection of the power supply capacitors usually reveals swollen or bulging capacitors.
If the capacitors look good, voltage checks would be needed to isolate the problem to either the main board or power supply. Check for 5 volts to the IR board (& or keyboard) , if five volts is present suspect the main board
If this TV has voltages from power supply , suspect the Z, X and buffers

May 26, 2012 | Televison & Video

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