Sony Wega TV kdf 42e655 possible Ballast Issue.

[Ziggazam]

Hello Members, I am New to the Badcaps Family and possibly a future active member. I am currently working on a Sony Wega 50" rear projection tv and I have done major research and troubleshooting on this device as well as even looked up the Sony TV code system. there is only 2 things that could be wrong at this point. Now I am more interested in repairing the ballast if it needs repairing since I work in a shop That has the proper equipment to do such work I work on circuit boards on a regular basis. But This is a bit different. according to my research the reason for this issue Is either a Bad lamp, or a color wheel that is losing lubrication on the ballast that lights the lamp. It is more cost effective to just replace the color wheel. But I need to know if this is actually possible or should I just replace the ballast?

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

You haven't mentioned the issue with the TV. What are the fault's symptoms?

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

The when the TV is powered on you get no picture and immediately the power Led blinks continuously and then you get the buzzing from the ballast attempting to light the lamp. I have removed the back cover and can even see a purple charge jumping across the ballast on the inside.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

From my limited knowledge of DLP/LCD rear-projection sets, the arcing across the ballast is normal - its job is to provide a high voltage pulse to the bulb to get an initial arc going, then pass the low voltage DC (around 20-50V at several amps) to the bulb.

If you are getting an arc, I think the ballast is fine, but the bulb may be dead.

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

http://www.techlore.com/article/1544...linking-Codes/

If you don't mind looking at this link that I have here that helped me get to this point. it explains what the led blinks mean on the front. I really appreciate your assistance with this, but I just want to be sure that I am reading this correctly.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Those look like CRT error codes. Is your set a CRT rear-projection or LCD/LCoS/DLP?

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Lcd

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

In which case they aren't applicable to your problem.

I am just finding the service manual now for you and will upload it shortly. That should have complete error codes.

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Thank you Sir Your Awesome. I hope That I could help you or some one else on the Boards in the near or distant future.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Here's the manual uploaded on my service manual site:



The blink codes are on the 7th page. Which fault is your TV indicating?

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

well the closest I am getting to the codes on this service manual is (ATSC-OVP error 10 times
-No "DTL MODULE 5V " output
(G1 board, G2 board)
- No picture/No sound)
But The LED blinks continuously without delay or pause. I have counted the blinks on the power led & its continuous until it goes back into standby.

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

I guess this is where i am getting confused. I don't want to replace parts that I don't have to.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

That isn't specified in the manual so I'm lost completely. It's not the lamp LED blinking, but the standby LED?

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Yes Its the Power LED blinking green continuously

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

yes the standby/power Led since they are shared on this unit.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

I wish I could help. Is the LED blink approx 0.3 seconds apart? Maybe it's the set repeatedly trying to power up and failing instead, which could cause a blinking LED, I suppose.

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Yes the blink is consistently 0.3 seconds apart on the unit.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

It seems really strange that Sony would not specify a continuous blinking LED error code. I do not know what the error code means and cannot offer much help as I have never repaired rear-projection sets (except one CRT rear projection, but they are almost completely different.)

[Ziggazam]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

Dont worry, You have been More than helpful & have given me a direction to move in. at least I know that the loose charge I am seeing on the Ballast Is Normal. LOL I am going to have a look at the G1 and G2 boards to see if i see any visual issues.

[tom66]

Re: Sony Wega TV kdf 42e655 possible Ballast Issue.

What you can do is check if there is a 20-50V supply going to the bulb. Don't test across the bulb as it gets a 5000V or so spike, but test before the ballast. I suspect it may simply be your bulb being bad, but for some reason it's detecting it as a different fault.