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In onida tv d2498 and fuse in power supply gone on connecting ac.Without main board installing please help

I have replaced twice and the same resut fuse and D2498 both gone

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If it's not the main board that's causing the fuse to blow then you have a short circuit somewhere in the power supply. Check things like the electrolytic capacitors. The ones that look like little cans. They should all have flat tops. If any are bulging out at the top they will need replacing. Also check the bridge rectifier which is a black component usually standing up on the board with four legs. If there is no bridge rectifier there will be 4 rectifier diodes together. They are black cylindrical items with a sliver band on one end and a lead out of each end. They are usually located near to where the mains lead enters the power board. Other things to check are power transistors, they are usually 3 legged, (sometimes 2 legs if they are used as a diode) black items with their case fixed to a heat sink (aluminium block.)

Posted on Dec 15, 2014

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Posted on Jan 02, 2017

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Samsung tv MODEL UN40F6300AFXZA


Please un-plug the cable between the main board & the power supply board, apply AC power to the TV, if the back light come on, that means the back lights & the power supply are OK, then you need to replace the main board; if the back lights does not light up, mostly the back light LED strip(s) is bad.

May 24, 2017 | Samsung Televison & Video

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What would cause TV no to turn on. Red light only. No flash, no sound, no picture. No bad caps or fuses. Replaced power supply board. No change. Red miniature led is lit on the tuner board when tv plu


This needs advance answering please provide me a photo of you tv set back opened and i will tell you what to check .. after this i might be able to tell you whats the problems
most possible is the Y-sus or Y-sus drive failure also mainboard might has an issue

Jul 08, 2014 | LG 50PA5500

1 Answer

HAVE A PHILIPS 15" WITHOUT


Good day!

Actually if your TV have problem like that it is not on the inverter.That problem could be on the power supply or the system board.

Follow this D.I.Y procedures to find the exact problem of your TV.
  1. Remove the back cover of your TV.
  2. After that,find the power supply board.
  3. If you already found the power supply,plug-in your TV and power it ON.Check the input voltage of it,using multimeter (AC range).If the power supply have no input voltage the problem could be the power cord.Replace it.
  4. If the power supply have the input voltage,try to test the output voltage if have 5vdc for the system and logic supply,12vdc for the sounds and 24vdc for the back-light inverter.Use your multimeter tester (DC range) to test that.
  5. If the power supply have a voltage outputs such as 5vdc,12vdc and 24vdc and the problem is still there.The problem could be the main board.Replace it with the same type and model # because the main board is no very difficult to fix and its very sensitive.
  6. If the power supply have no output voltage or the voltage is too low,just ignore the step # 5 because the problem is not on the main board,its on the power supply board.
Check the following to fix the power supply board:
  • Fuse: Check the fuse if it is busted or blown.
  • Power transistor (regulator): Check the regulator if it is shorted or leak.
  • Resistor: Check the resistors specially the one that have a low resistance that near the power regulator.
  • Capacitor: Also check the capacitors if it is leak or bulging top.
NOTE: If you found any defective parts or components that mention above replace it with the same value,type and ratings.

I hope this solution will be helpful.Thank you and good luck.

Apr 28, 2011 | Televison & Video

2 Answers

Have a Sony Bravia KDL-40v4100 Flat panel, had a bad storm, lightening strike in front of house, now the tv will not turn on.


Now tv turn on?Front LCD screen panel power light indication flashes or totally dead?Yes,than the power board is dead,that the board where power a/c cord plug into it.Take the tv aparts.That the power supply board,require changing.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

Jul 27, 2010 | Sony BRAVIA KDL-46V3000 Television

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LIGHTNING STRUCK THE ELECTRICAL POLE DOWN THE STREET. THERE WAS A POWER SURGE AND WHEN THE POWER RESUME THE TV DID NOT COME ON


Now ur tv LED power light indication on the front LCD panel flashes?Yes,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 replacement.

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Lost power completely


If you are comfortable with working in tv circuit boards then unplug tv from AC wall socket, take off back of tv and follow AC cord going inside tv that will take you to power supply board, check fuse on power supply board, replace it with same rating written on it if it found blown.
Replug tv back in wall socket and check if it turns On.
If still problem not solved then power supply board is defective and need to be replaced.
Local tv repair shop will help you if you think its not safe for you to work inside tv.
Hope these info will help you.
Thanks.

Jul 10, 2010 | Protron PLTV-4250 42 in. LCD Television

1 Answer

Display on and off


that problem is very common on a viewsonic tv.you need to open the back cover of your tv by removing the four screw.you can immediately see the power supply of your tv after the cover is remove..It is a small pc board where the ac power cord is connected..First using a multitester measure the output voltage of the power supply.the output must be 5v for cpu,12v for sound and 24v for the inverter board.this inverter board is the one responsible for illuminating the screen of your tv...if the output are complete,,replace the converter board..if one voltage output of the power supply is missing replace the power supply board...g

good luck!hope i help you...
please vote for my help tnx..

Jun 03, 2010 | ViewSonic VE510b Monitor

2 Answers

Tv has no power and will not switch on


I would suggest the same with one difference; overnight.
If it still fails to turn on and you are lucky, a main AC fuse may have failed (they do this from metal fatigue) and may be user replaceable. If you find no fuse (inside the set), the main power supply has probably failed. BTW, allow an hour or two without AC to let dangerous parts discharge.
Look for a board that has larger components on it, some block shaped (transformers and chokes) and larger capacitors that are cylindrical and mounted at 90 degrees to the board. If you can find a part number (assemblies will likely have a paper label), call the service center in your area and inquire about replacement or repair costs, which may be pretty close together.
These boards normally are connected with plugs and fairly easy to replace since the plugs are intentionally made so they can't be interchanged.

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My akai tv model lct3785ta will not turn on


Ok.. What is the status of the power LED at the front. Does it blink, change color a few seconds after its turned on? Do you notice any clicking noise from the set?

Please provide this info so that we can continue with the diagnosis.
Sai.

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