Question about Sony FD Trinitron WEGA KV-32FS16 32" TV

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Goldstar tv power supply problem, leak of voltage going to mainboard, the 120v suddenly decrease after a whiloe to zero

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Leak of voltage going to mainboard, the 120v suddenly decrease after a whiloe to zero you mean short circuit. it is not power supply problem as you say that it drops to zero after connecting main board. it clearly indicates that problem in horizontal output section.

Posted on Sep 19, 2007

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Posted on Jan 02, 2017

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What is a swirtching regulator


A switching regulator is a bit of electronic circuitry that regulates the voltage conversion on a switching power supply, Modern TV sets have switching powers supplies that converts the 120V AC to DC voltages that drives the circuits. You may have to replace the power supply.

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Relay clicks when applying power. Yellow light comes on. TV is dead otherwise. Power supply is outputting +5, 12, and 24 volts Mainboard (3647-0282-0150) has +5 and 12 volts always applied. Checked...


Amber light on means standby voltage is high. IF amber light does not go white when power button is pushed the its one of two things.
A. No power on command from main board. Usually labeled PS-On. Should go high from 3.3v or maybe 5volts. If not present Main is defective.

B. If the ps-on line is going high then your problem is a defective power supply.

Oct 15, 2013 | Vizio XVT472SV 47 in. HD-Ready LCD TV

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Westinghouse TV model LD 4680 suddenly powered off will not repower


i fix these tv's on a daily basis at work, its the mainboard as these tv's power supply is part of the main board. there's only 1 board in these tv's actually.
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1 Answer

Why does my vizio lcd 47 in tv just suddenly turn off. I will be watching tv and suddenly it just goes off. The vizio power light then blinks steady for about 1 min and then the tv starts up again, as if...


Good day!

Please follow this procedure to fix your problem:
  1. Open the cover of your TV.Remove all screws at the back.
  2. Next,power ON the TV and check the output voltage of power supply using voltmeter.
  3. It should have not less than 5vdc for system board,12vdc for sounds and 24vdc for inverter board.If the 3 supplies are got a voltage drop your power supply had problem.For example if you check the 5vdc then the reading is 4.50vdc only.
  4. If you have voltage drop,check some leak/bulge on top capacitor on power supply.replace it by using soldering iron and soldering pump.
  5. When the power supply looks like OK,no voltage drop and no leak/bulge on top capacitor.The problem is your system board or main board.There's no easy remedy for that.You have to replace the whole system board.
I hope this solution helps you to fix your problem.Thank you and good luck.

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1 Answer

I have a Bush 26" lcd tv. when i try and power the


If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Can't answer more than this without any details.

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They are lightly loaded and WILL take time to bleed off the charge on the caps.

Also switching power supplies MUST have a load on them or they MAY overvoltage.

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1 Answer

Power supply Ok.But CPU fans started with seconds It's stop.


sounds to me like your mainboard is bad, i bet if you closely inspect the capacitors around the cpu one or more is bulged out or leaking

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1 Answer

Sharp LC-45D40U Won't Power On! Need Help!


If doesn't give error code most probably is something wrong with 5 and 3.3 volts lines. Check first the power supply and try to start the tv with all connectors removed. Let only the one between main pcb and power supply. Look for shorted voltages lines.

Apr 10, 2008 | Televison & Video

1 Answer

GOLDSTAR BRAND TV


pls check power supply output. check the voltage difference in both conditions

Dec 05, 2007 | Televison & Video

1 Answer

Power supply of tv


if voltage drops means there is a short circuit in your tv. 1 disconnecting 120v line if supply becomes ok then there is short ckt in horz.section &if it does not gives 120 volts then there is problem in power supply. please check as per instruction &let me know. good luck.

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