Bush (samsung) - Plasma Sound but no picture, click click

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Sourcing them is the problem, if you can find replacements for RJP30E2 and the driver ICs are OK then you probably can.

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Hi Tom,

Once again, thank you for your assistance. Seems like it really is a chance buying the parts with P&P added to fix it, it could end up costing as much as a new board not to mention the work involved. I think, rather than paying £70 for 2 boards and later finding out it still doesn't work, I will buy the Y-Main first and see if voltage holds on that. If so,I can then buy the X-Main. I will not connect the X-main at all in this test (obviously I don't want the X-Main to take out the new Y-Main.

Does this seem logical to you Tom?

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

That sounds right; however, do understand that a design change to these TVs at some point may mean it shuts down if X-main unplugged.

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Hi Tom.

I did end up buying both boards so should have them soon. I actually got the y buffer too all for £52 p&p included. Thought that was awesome. ��

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

After the set works see if you can apply the software update to it that should prevent it happening again -- though I'm not sure if you can do that from a non Samsung TV.

[jose6326]

Re: Bush (samsung) - Plasma Sound but no picture, click click

I've highlighted devices on the Y-main for your testing.

To test the three legged FETs/IGBTs: Put your meter on diode mode, and test all six combinations (red-black) (1-2, 2-1, 1-3, 3-1, 2-3, 3-2) Report readings and part# for each.

To test the two legged diodes: Put your meter on diode mode, and test both combinations (red-black) (1-2, 2-1). Report readings and part# for each.

tom can i do this same test on my logic board?

https://www.badcaps.net/forum/showthread.php?t=28943

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Hi Tom,

Hi got the Y-main and it came with a Y-Buffer and the X-main came earlier in the week, back the drawing board.

Here is how it goes.
Original parts: Y-main connected to PSU only, got power but slowly drops but does NOT go click click off. Connect either the power cable from Y-main to X-main or ribbon cable to logic board click click off.

With replacement parts: Y-main connected to PSU and ribbon cable to logic board,got power but slowly drops but does NOT go click click off. When I connect the power cable from the Y-main to X-main I get click click off.

My thoughts is the X-main I got is faulty. Is there a way I can get a sure answer on this by testing it? Your thoughts please.

Thanks mate.

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

You can test the X-main in the same way I have indicated on Y-main... if you need help there then I can help you if you post a picture of the bottom.

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Hi Tom,

I have tested the old X and the replacement X and the FETs give the same reading, i've noticed that the first transistor and last transistor give the same reading (short sound), are they meant to do this? The Transistor is a RJH30E2.

I've tested the old Y board and it has similar ones (RJP30E2) it does the same. If it didn't give a short sound I was going to remove them and fit it to the X-main, not sure if this would have been a good idea or not.

I have included pictures but basically my old and replacement X give the exact same readings. First and last short sounds same FET.

Thanks

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Your replacement X is bad too.
Jeez I really wish people would actually test boards they pull before they stick 'em on eBay.

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Hi Tom,

I just through I would add as I forgot to say, with the x-main unplugged leaving the replacement y-main and y-buffer although the TV does NOT click click off into standby, the VS & VA voltage drops to very little and I still see no sign of anything on the screen. I thought I would have at least seen something on the screen?

Is there any chance of the screen being burnt out or anything like that as I heard that plasma is a gas panel. Is it likely the logic board could also be at fault. I am still waiting to hear from the guy on ebay about a return on the X-main so I have plenty of time to rethink and further test.

A note on the x-main, when i tested it on diode mode every FET gave the same reading. The 1st and last FET on each board gave a short sound. Is it a must for every FET to give a reading?

As I have said before I really appreciate the education, thanks.

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

You should not get any short sound from any FET. They are defective, you risk damaging your Y-main by continuing to operate it like that

The panel can leak gas if cracked, however, this will cause it to buzz very loudly with no image. It will not cause it to be silent with no image. If it is not cracked, you have nothing to worry about.

File a dispute on eBay if they do not respond within reasonable time.

Here is the buzzing you would hear if the panel were bad.
https://www.youtube.com/watch?v=-iAm82lhky4&t=1m10s

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Hi Tom,

The supplier on ebay has said i'll be refunded over the next week, no questions asked. This time I have chosen to use a respectable TV parts seller, perhaps you have heard of them 'Emos TV' so the part should be here on Friday.

I have noticed another fault, I think when I installed the faulty X-main it has blew an IC chip. I performed the test where you run the positive up the ribbon cable while grounded. My question is, as I have two faulty Y-buffer boards, can I remove an IC from one and fix it to the other? I've seen videos but it looks like people use new IC's.

Thakns

[tom66]

Re: Bush (samsung) - Plasma Sound but no picture, click click

You can, but you have to be sure the IC is good first. If you have blown a chip on your Y-buffer, then the Y-main may still be bad...

[Vipermarty]

Re: Bush (samsung) - Plasma Sound but no picture, click click

Ok Tom got the part and tested the FETs, first and last gave valid readings I installed the X-main and the TV powered but no screen. The voltage dropped as it does (VS very low) but didn't click off into standby mode like the other 2 did. So you know in samsung TV's 2010+ the voltage drops like this when the control board detects a fault, if you didn't already know (what I have read).

I got curious and that cost me. So I removed the ribbon from Y to control board to keep the power on VS 207, as it does... perhaps this means something. It wasn't long before the TV then clicked into standby and I said "oh oh". I've just shorted the new X-main first and last FET shorting now.

Going back to what you said before, maybe the Y-main is faulty although all FETs tested fine the IC was blown in the buffer.

My question is... would the control board detect a faulty IC and drop the voltage for safety reason causing the screen not to come on or would it detect the Y being faulty and drop the voltage?

I am trying to work out if the Y-main is causing the TV not to come on, the y-main or both. As I can not find a fault in the Y-main by physical examination and readings on FET.

Do you know a good place where I can get replacement FETs for G RJH30E2 0304 to repair my X-main?

Thanks Tom

[uglybloke1]

Re: Bush (samsung) - Plasma Sound but no picture, click click

hi i have same tv and its doing the same thing did you get it fixed if yes can you tell me what part that was broken thanks

[finntricky]

Re: Bush (samsung) - Plasma Sound but no picture, click click

got the same problem here, the 2 shorted fets on the x-main, replaced them, but left ribbon cables disconnected from x and y, and tv boots and stays on, but no screen glow that i can see, as soon as i connect a ribbon to the x or y the tv just clicks, and goes back to stand by, can;t find any faults on y main or buffer, ?