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My Sony KDL 50w800c will not turn on.

I have tested the power source and it measures fine. I have also done a power flush. I am test the boards now to see if there is continuity.

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Posted on Oct 10, 2008

vinnyq
  • 157 Answers

SOURCE: sony bravia kdl-52w3000, turn tv on, no picture or

Most likely this is caused by a defective main board. Changing the main board will fix the issue about 95% of the time.

To be absolutely sure, the voltages need to be checked on the power supply. If they are not the values listed in the service manual, then you should replace the power supply instead (accounts for the other 5% of the time).

Posted on Oct 07, 2009

repairtech99
  • 767 Answers

SOURCE: hobart handler 135 feed motor for wire doesn't

check the SCR ,looks like a big transistor mounted
to a heat sink or some of the older units had a relay
in-line with a fuse , I have a older Hobart and it is
a great little welder. If you snap a pic of the P.C.
board and email it ill rsheehan@northernsteeldesigns.com

point out what parts to check.and replace.

Rob

Posted on Dec 06, 2009

SOURCE: Dell Dimension 5100 will not power up. Was

Have you checked your monitor? Try your monitor on another PC and check it is OK. Once you change the MB battery you effectively "Kill" the PC, as all the settings in the BIOS are removed and must be reprogrammed. You must enter the BIOS, and select "Default" setup and then reboot, you must do this regardless of what else is done first.(A bit hard when you can't see anything" You say... "tried different power switch and ribbon cable connector" (sic) exactly what "Ribbon cable/Power switch"? Anyway as said check monitor, if it is OK, we will proceed from there, then, you must check your video card, test it in another machine, if possible, to see if thats OK, if it is OK, then it is now likely that you may have a Mother board problem. If you can, try another Video card to see if you get Video on screen. see we need to establish "Known Good" items, once we know whats what, we can then go on. Now if any of these things tested are faulty, Monitor, Video card, obviously replace them, however IF they are NOT faulty, as related it may be the Motherboard, Remove the RAM, and see if anything is on screen? If yes, replace RAM, If still NO, then take any cards out, and check, if then OK, replace cards one by one until you get to the one that stops it, there is your problem, replace it. All we are trying to do is get anything on the screen, if we do, then you must redo the BIOS, as related before. Now if you get it going it still may not boot through to windows desktop, if this is the case, after you boot press F8 and select safe mode, when you get asked if you want safe mode or system restore, choose system restore and choose a date before you had a problem that should get you back. You just have to logically work through, until you find the faulty "bit" and replace it.

Posted on Feb 22, 2010

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  • 1 Answer

SOURCE: Miller 130XP won't feed wire

need a replacement wire feed motor for a millermatic 130xp

Posted on Mar 21, 2010

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1 Answer

CAN YOU DIRECT ME TO EITHER THE INVERTER BOARD OR THE MAIN BOARD.


Hello Calvin,
I would suggest to change the input to a video with audio source to eliminate a main board failure.
If the back lights are not working, this could indicate that the inverter board is defective but there could also be a defective CCFL light failure.
You can find service parts in the link provided.
Let me know if you required further assistance. Search results for kdl 40bx450

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Phillips 52pfl5704d turns on screen blinks, no video


The replacement board could be defective. Your TV worked fine until there was a power loss so its time to troubleshoot to find out how the power loss affected the original board in theTV. There could have been a power surge.

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1 Answer

Sony KDL-40U2000 will not turn on. No lights at all, totally dead.


I think the 5 volts missing is your problem---it should come from the standby power supply and ought to be there all the time.

Look to the source for that voltage and check to see if a dead short to ground on that line.

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Sony kdl-52s 4100 power supply ok but no sound and display


Well, if the power supply is in good working order, you will need to verify that the proper voltages are getting to the main board. If the main board is getting the proper voltages, I would bet you have a defective main board. The video and audio signals are generated on the main board. Expect to pay $100-$150 for a replacement main board.

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1 Answer

I have a Sony KDL-46V5100, powers up but turns of right away


you have to check the power supply of the tv. If possible tyr to replace the electrolytic capacitors on the power supply board . sometimes bad electrolytic capacitors can cause such problems. Visually it would be ok . but while working it would malfunction. here added a video. it will help you understand how to deal with the power supply board. If you find the power supply is ok. the your tv need a new mother board.
http://electro-medical.blogspot.com/

Testing LCD TV Power Supply BoardsSTEP BY STEP

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1 Answer

No power 2 stanby blink light


It could be a power board problem. Why don't you please refer it to a qualified service technician?

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1 Answer

Hello, I've been given a Sony Bravia KDL-26ML130 LCD TV which is not working but I believe it may have a repair solution (hopefully!). The TV powers on fine but the display turns off just a second...


This tv problems are those long board call the LCD inverter boards,it is dead.TV should have 1 or 2 long boards that call the LCD inverter boards it it dead,these 1 or 2 long LCD inverter boards only job are to provide a backlight to the tv LCD screen panel to have screen light produce a picture.Tries websites like Shojimmy.com,Ebay.com to buy those refurbihes 1 or 2 long LCD inverter boards for the replacment.

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1 Answer

Kdl-46v5100 tv now dos'nt recognize hdmi.says no


Try another HDMI cable. I have seen them become defective. If it is not the cable, then try another HDMI device to test the TV.
Without an HDMI cable tester, and a way to measure the output of the HDMI source device the only way to resolve this is with the process of elimination.
Jerry G.

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1 Answer

MY SONY KDL-40S4100 IS ON STAND BY AND THE RED LIGHT BLINKS TWICE


The most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

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1 Answer

I turned the tv on and changed the channel. Now it says


What inputs have you tested.If your sure about the program sources and still no signal then replace the AU board.

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