Sanyo lcd-37xr9da picture negative, abnormal display

[tw2005]

ok, I have a SANYO LCD 37XR9DA Full HD TV. It's actually manufactured by Xoceco and from I've seen parts seem to match the DYNEX brand LCDs.

The panel is an AUO (AU Optronics) panel and TCON board T370HW02 V7. BUILD Date of the TV is MAY 09.

Starts and works normally except the entire display is like a colour photo negative.

all inputs, same result.

If I plug the AV out to a Tv then the output is correct on the external TV so I'm thinking the main board is ok.

I've reseated and manipulated the LVDS cable at both the Main board & TCON board with no change.

reseated flat ribbon cables to the panel and no change either.

In service mode, white, red,green,blue and black test patterns appear good.

the pop-up menu appears ok and sharp enough although I think the colour is slightly wrong. Pure black or white displays ok.

The AS15-F LCD driver chip is getting too hot to touch and the AUO-043 chip also gets pretty warm with signs of discolouration of the markings.

Something else I notice is there are no heatpads attached to the chips. There's are V402 board I've seen which appears identical to the V7 which does have pads attached to all the major chips.

I'm wondering if this may have caused this board to fail, assuming mine is faulty which I'm yet to prove.

I'M THINKING IT'S THE TCON (AND HOPING)

Anyone have some experience with this kind of problem?










This is the TCON

[retiredcaps]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Welcome. If you are going to be a regular here, please do not post images inline for the following reasons

https://www.badcaps.net/forum/showpo...5&postcount=12

Instead, use the manage attachments button to upload the pictures so they are hosted here. They show up as thumbnails and then I can optionally click on each to get the fullscreen.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Ok, sorry.

Most of the sites here in Australia won't allow image uploads direct but must be hosted elsewhere. Something I find frustrating as my forum skills are probably not the best. I'll follow your advice for next time.

Thanks.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Here's an update at where i am at with this TV. Managed to find a used TCON online. This is now the result I have. As far as i am concerned this confirms my original TCON was faulty and the cause.

But now I have this result. There are 2 connectors, and I believe the output from J1 on the replacement TCON is also bad. i.e. the replacement TCON is a dud.


Notice the menu/service OSD is now the wrong colour and the variation in the white screen on both sides. right seems a little off white?

Can someone definitely confirm I am correct to say the panel is good and the TCON is still bad? It looks that way to me.



,,,

[pigdaddy]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Hi.

I think I have a similar problem with my 37xr9da, could you look at these pics and tell me what you think?

<edit> forgot to mention those where taken after a full reset, when i start the tv up now the "SANYO" logo is excessively bright red and bleeds out with purple highlighting, and the N appears very very jagged </edit>

http://i197.photobucket.com/albums/a...0-09180903.jpg
http://i197.photobucket.com/albums/a...0-09180930.jpg
http://i197.photobucket.com/albums/a...0-09180952.jpg
http://i197.photobucket.com/albums/a...0-09180956.jpg
http://i197.photobucket.com/albums/a...0-09181002.jpg
http://i197.photobucket.com/albums/a...0-09181032.jpg
http://i197.photobucket.com/albums/a...0-09181106.jpg
http://i197.photobucket.com/albums/a...0-09182820.jpg
http://i197.photobucket.com/albums/a...0-09182851.jpg

more pics, sorry for posting it this way but had already deleted from hdd

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Hi.

I think I have a similar problem with my 37xr9da, could you look at these pics and tell me what you think?

<edit> forgot to mention those where taken after a full reset, when i start the tv up now the "SANYO" logo is excessively bright red and bleeds out with purple highlighting, and the N appears very very jagged </edit>

http://i197.photobucket.com/albums/a...0-09180903.jpg
http://i197.photobucket.com/albums/a...0-09180930.jpg
http://i197.photobucket.com/albums/a...0-09180952.jpg
http://i197.photobucket.com/albums/a...0-09180956.jpg
http://i197.photobucket.com/albums/a...0-09181002.jpg
http://i197.photobucket.com/albums/a...0-09181032.jpg
http://i197.photobucket.com/albums/a...0-09181106.jpg
http://i197.photobucket.com/albums/a...0-09182820.jpg
http://i197.photobucket.com/albums/a...0-09182851.jpg

more pics, sorry for posting it this way but had already deleted from hdd

Unbelievable. I can't take a trick. desparate to get someone to confirm my fault and I find this is my first reply asking me to give an opinion on a fault.

Don't get me wrong, love to help but I'm not 100% sure of my issue although I would put money on it being a bad TCON.

Yours does look slightly similar to my problem with my original board which failed further making everything pale, whitish.

On the back of the TCON board top left square chip # U201 was red hot on my really bad board. On the replacement it was cool.

Good luck on finding a good used board. Stay away from Chinese TAOBAO sellers.

The service manual is not that good.
you can get it here.
I could not upload it for some reason.

If you decide to use the service mode, do not play around with the settings unless you know what values they should be. There is a white, red,green, blue and black pattern you can turn on. This did not help me much as it looked pretty normal so I guess that means the panel is good?

I really need an experienced tech to confirm my problem as being a bad TCON.

Good Luck.

[pigdaddy]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

My tv is going to sanyo next week for assessment. When I hear back I'll post here what they said. Maybe that will help you.

A brief conversation I had with a sanyo tech said it would either be the Tcon or the Panel. So 1 cheap or 1 expensive item.

Will keep you posted when I know more.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

My tv is going to sanyo next week for assessment. When I hear back I'll post here what they said. Maybe that will help you.

A brief conversation I had with a sanyo tech said it would either be the Tcon or the Panel. So 1 cheap or 1 expensive item.

Will keep you posted when I know more.

Cheers, thanks for that. if you can find out the exact cost of the TCON board by itself I'll be really interested. Thanks

[pigdaddy]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Google search for the Tcon, from my research I've seen it from about AUD$50-$80. IF you can get it that is, I searched using the part number u posted. Not sure how it all works, one of the ones I saw with the same part number said it was for a different named panel, think I saw a couple though compatible with AUO panels.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Google search for the Tcon, from my research I've seen it from about AUD$50-$80. IF you can get it that is, I searched using the part number u posted. Not sure how it all works, one of the ones I saw with the same part number said it was for a different named panel, think I saw a couple though compatible with AUO panels.

Yeah I've done the google bit but when you get it looked at by SANYO it would be interesting what they quote for a brand new board. I'm not sure if all the boards you see on the net are new. Some come out of stripped down broken sets.

[pigdaddy]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

hey mate, just wanted to touch base with u if ur still watching this thread. The TV is currently at Sanyo, don't have any more info at the moment but wanted to make sure you knew I was still thinking of you. When I hear more I'll post it here.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

hey mate, just wanted to touch base with u if ur still watching this thread. The TV is currently at Sanyo, don't have any more info at the moment but wanted to make sure you knew I was still thinking of you. When I hear more I'll post it here.

No worries. i managed to get a used tcon from china but i believe it was a dud and have requested and replacement which arrived in Sydney yesterday. The first board fixed right 50% of screen perfect, left side still noisy but different symptoms. I believe I'm on the right track.

had to lodge a PAYPAL dispute to get things moving(it motivated the seller). Hoping the second board is better.

I am starting to wondering if these have a definite issue around the 2 year mark. I've since seen about 2 or 3 others for sale with similar symtoms including a Samsung which i know also uses the same AUO LCD panel/TCON combo.

I have had some suggest panel fault but I'm still not convinced and hopeful TCON only. Since the symptoms have changed I'm pretty confident it's going to be a TCON and I expect yours will be too.

[PlainBill]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

If replacing the tcon fixed half (one side?) of the screen, I'd say that confirms the problem is the TCON and not the panel.

PlainBill

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

If replacing the tcon fixed half (one side?) of the screen, I'd say that confirms the problem is the TCON and not the panel.

PlainBill

Thanks. You're the first person to apply the same logic as myself and suggest TCON fault with the evidence to date.

Hope to post some good news here soon but I will not be surprised that I get another dud. If it does go well I think I'll heatpad all the chips to the metal cover as they appear to have done on the T370HW02 V402 TCON.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Ok, the good news / bad news with the latest TCON. The good is I now have a complete picture which is viewable. The bad is I have the brightness up pretty high to make it ok, plus for want of a better word "image burn?"
Basically I'm getting after images especially on anything that has been a still image similar to what can happen on the PLasma screens.

It does not happen for the first minute or two but once the set warms up (I suspect the TCON getting hot) it happens quite easily and does not clear.

Here's some shots.

Original TCON, First replacement with half good/half bad.
complete picture which seems okService menu white screen. Note the after image word "exclusive" leftover.
after image from the service menu.

I'm going to pull this set apart again and put the second board with half screen ok and see if I can replicate the after image there as well.

Has anyone seen this before? I thought it was only plasmas which have this problem. It's as though there is some residual current left in the TCON circuit from the previous images?? Sounds crazy I know.

The funny thing is the picture is watchable as long as you don't get a still image on screen for too long.

[tom66]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Many LCDs have problems with temporary image retention. If a static image remains on the screen for long time, it "burns in". However, the burn in is temporary - a few flashes between white and black is usually enough to clear it.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Many LCDs have problems with temporary image retention. If a static image remains on the screen for long time, it "burns in". However, the burn in is temporary - a few flashes between white and black is usually enough to clear it.

The still shot does not have to be on for too long for it to occur. Am I worrying about nothing or could a slightly sus tcon do this as well?

I'm watching it next to my 1080i crt. I'm yet to find a large flat panel which comes remotely close to the definition of "outdated technology".

[tom66]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

The still shot does not have to be on for too long for it to occur. Am I worrying about nothing or could a slightly sus tcon do this as well?

I'm watching it next to my 1080i crt. I'm yet to find a large flat panel which comes remotely close to the definition of "outdated technology".

How long is "not too long"? My LCD I repaired (42" 720p) starts showing retention after about 30 secs - 1 minute.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

How long is "not too long"? My LCD I repaired (42" 720p) starts showing retention after about 30 secs - 1 minute.

About 30 secs would be on the money maybe a little shorter.

[tw2005]

Re: Sanyo lcd-37xr9da picture negative, abnormal display

Tried the second TCON and could not get any image persistance to occur no matter how long it was on.

Time to give up and live with what I have. Lesson learnt.