Problem with Sony KDL-37S5500

[dr-mr]

Hi to all
Long time reader first time poster.
I have problem with the Sony KDL-37S5500, Main Board 1-878-999-22 A-1641-831-A. PSU SONY PSC10270F 3H267W.
First the image looked like washed I tried to reset the cable on the T-con Board but nothing cnanged.
I ordered new board, but when i turn the tv the backlight turns on the green led on the fronti is on and blinks when i press some button, no picture no sound.
I tried the old T-con and two new boards, and i tried with different main board no changes.
I measured the voltages on the power supply
15v are 17.4v but the rest are ok
I don't know how much power on and ac off detect should be ,
power on is 2.84v ac off det is 2.88
Any suggestions
Sorry for my english

[dick_barton]

Re: Problem with Sony KDL-37S5500

Hello,
Can you post some sharp pictures of your boards and the layout which would help us help you. Have you tried to do an firmware update.


Manual available from:



Training manual

[budm]

Re: Problem with Sony KDL-37S5500

So you had washed out pictures on the screen, then you changed the board (T-COB board?) and now you get no pictures, no sound.
So what happen if you put ALL the original boards back in place to get the original problem back and then take the screen shot of the screen to show us what the washed out pictures look like, seems to you have GAMMA Voltages problem on the original T-CON.

[ReeceyBurger123]

Re: Problem with Sony KDL-37S5500

So you hasd wahsed out pictures on the screen, the you changed the board (T-COB board?) and now you get no pictures, no sound.
So what happen if you put ALL the original boards back in place to get the original problem back and then take the screen shot of the screen to show us what the washed out pictures look like, seems to you have GAMMA Voltages problem on the original T-CON.

+1 possibly wrong board for that panel.

[dr-mr]

Re: Problem with Sony KDL-37S5500

The tv is not turning on with the old T-con board
I tried the old board and 2 new boards no changes.
When the tv had washed picture i tried to reset the cables clean the connectors on the t-con but nothing workt. then i ordered new board, when i changed the board and turn the tv on only backlight no picture no meny nothing, i put back the old board same story i tried with another board same,
i changed the mainboard nothing changed.
Pictures from the boards
http://imgur.com/a/3R5Kr

[budm]

Re: Problem with Sony KDL-37S5500

You better check those cable conductor traces to see if they are damaged, since the problem got worst then you need to recheck yours works with all the old board back in place.
I can see that the flex cables between the LCD panel and the T-CON board are in crooked and half way in! You don't see that?
BTW, the washed pictures is more likely due to bad U500 GAMMA IC

[dr-mr]

Re: Problem with Sony KDL-37S5500

I put the board just tu take picture.When i reseted the flat cables the first time when the tv had picture, i disconected one side and half of the panel went black.
Now nothing is changing wit ore widout T-con conected when i turn on the tv

The n flat cables are ok, chackt good

[Diah]

Re: Problem with Sony KDL-37S5500

hold on.... first you need to know how you plug the ribbon cable correctly either the LVDS cable. look on yours T-CON Photo, the right side cable wrong seated,,, and the left too either the LVDS.. this one time wrong seated cable by Sony should great error code ( blinking LED ) where you didnt mentioned at all on this.

[dr-mr]

Re: Problem with Sony KDL-37S5500

The board was connected only for taking picture, not for testing.
The led is turning on green, when i press buttons on the tv or the remote the grin led blinks while the button is pressed.

[newtothis]

Re: Problem with Sony KDL-37S5500

Can you seat all cables correctly for us and then take a picture for us to see?

Understand that you may of been a long time reader but not a poster - You may/may not know how to insert the cables correctly but either way we ourselves have no idea what your skill level is So we have to assume you are new to working with such devices.

I agree with above - Your initial issue would of been the AS15 gamma IC.

[dr-mr]

Re: Problem with Sony KDL-37S5500

Sorry for the misunderstanding and waste of time.
Pictures.
On pictures 4 and 5 is the screen when the tv is on

[Diah]

Re: Problem with Sony KDL-37S5500

please put back all original boards MB and T-CON. and let check why yours PSU over clock the 15 Volts to 17..etc.

disconnect the cable between MB and T-CON from the MB side and tuen on,, check the 15 Volts remain High or back to normal.

if remain high put back the cable above and try to disconnect the IR section MB and check the 15 Volts again.

if it remain high put back IR and disconnect the speaker and check.

between the ribbon cable the right side one,, look bad

this is ur PSU

[budm]

Re: Problem with Sony KDL-37S5500

https://www.badcaps.net/forum/attach...6&d=1467208983
Are you sure those cables seated properly? They still do not look like they are all the way in or straight at both ends of the cables. The Right one does not look well.

https://www.badcaps.net/forum/attach...0&d=1467208983
Is that what you see on the screen before you start changing the boards?

[dick_barton]

Re: Problem with Sony KDL-37S5500

Are you lifting the tabs to insert / disconnect those ribbon cable?

[dr-mr]

Re: Problem with Sony KDL-37S5500

Diah i measured everything you suggested no changes on the 17v
i tried with other T-con and mb same 17v.

The cables are connected good i reconnected them 50 times in the last 3 days
The icture of the screen is after i changed the t-con.
First when i started the tv the picture was like on this video just more intens.
The video is not mine, i hope that is no problem.
https://www.youtube.com/watch?v=4nYQfE2yBJ0

[Diah]

Re: Problem with Sony KDL-37S5500

The cables are connected good i reconnected them 50 times

do it for the 51 time, but this last time please inspect their pins with Magnifier, also with DMM as diode peep on methods between both end sides.. there it may one pin Brocken.. please check this for yours sake of spending time.

[dr-mr]

Re: Problem with Sony KDL-37S5500

I chacked the flat cables under magnifier with strong light and with continuity test on the multimeter, thay are ok.
I hawe another lvds cable, i changed it, no changes with the tv

[Diah]

Re: Problem with Sony KDL-37S5500

if yours first picture fault as you mentioned with other video links, its okay the T-CON gamma IC as they mentioned above, but you had before change new T_CON you tried to reseated the ribbon cable, and they was diffidently wrong seated ... i still believe one are defect . sorry

[dr-mr]

Re: Problem with Sony KDL-37S5500

When i receive the tv i turned it on and the picture was like on the video just more intense. I tried reseting the flat cables, hiting the cables resultet with little flickering on the panel. i tried the tv with only one flat cable connected to the t-con the pane had picture only on one side.
Than i decided to change the t-con board, i turn of the tv and order new board.
when i get the board i changed it and turned the tv on, than only the backlight turmed on and the green led for power on, no picture, no menu, no sound nothing.
After that i changed back the old t-con but nothing changed still no picture ore manu , ore sound. i tred third t-con but same, i triedother mb still the same.
It doesn't matter if the t-con is connected or not, the tv is still the same only backlight and green led for power on.

[dr-mr]

Re: Problem with Sony KDL-37S5500

I made one more problem now.
I tached the 15v and sgnd.
Now when i turn the tv on it turns on the back light and the green led (like before my mistake) but after 5 10 seconds one relay clicks and the tv goes off.
the red led starts blinking 8 times.
turning the tv on ore off from the buton is not posible now.