Sony Bravia no picture but backlight on

[cartgen]

Re: Sony Bravia no picture but backlight on

KDL-32S5100, KDL-40S5100, KDL-46S5100 - Sony TV Service Manual:
https://servicemanuals.us/sony/tv/kd...l-46s5100.html

[steves7839]

Re: Sony Bravia no picture but backlight on

See if heating, flexing or chilling with freeze spray (dust-off in a can held upside down) affects the symptom. If it does, try to isolate to a specific board and component.

[Louis82]

Re: Sony Bravia no picture but backlight on

Thank you Budm.

[budm]

Re: Sony Bravia no picture but backlight on

I am not so sure at this point as to where where the problem is.

[Louis82]

Re: Sony Bravia no picture but backlight on

Hi Budm. Where you able to see the pics?

[Louis82]

Re: Sony Bravia no picture but backlight on

Hey budm,

I did try reseating all cables and screws and I'm still getting same problem. I got pictures of the thin lines or distorted picture. This issue changes in less than a sec. I was able to get a pic with the distortion and another one looking normal.

[budm]

Re: Sony Bravia no picture but backlight on

I meant to say re-seating the connectors/cables.

[Louis82]

Re: Sony Bravia no picture but backlight on

Thank you Budm. I will try that.

[budm]

Re: Sony Bravia no picture but backlight on

I do not know, I like to see the screen shot to see what kind of images you are getting on the screen.
BTW, you already try resting the cables and tighten all the boards' mounting screws?

[Louis82]

Re: Sony Bravia no picture but backlight on

Thank you Budm.
I guess I will look for BE2 Board instead
http://www.shopjimmy.com/sony-a-1212...-be2-board.htm

What's your opinion?

[budm]

Re: Sony Bravia no picture but backlight on

So it is this AU board:
http://www.shopjimmy.com/sony-a-1212-254-a-au-board.htm
This will not cause the symptom you described.

[Louis82]

Re: Sony Bravia no picture but backlight on

Hi Budm,
The descriptions of the AU Board says AU Signal Board. Can't offer any picture at this time. I don't have tv with me.

Picture is very clear but has these short horizontal lines all over the place and they appear and disapear. I could say it looks like the scramble picture issue that Toshiba projo tv's used to have and that the problem was caused by the hyper module.

[budm]

Re: Sony Bravia no picture but backlight on

These are the boards used in your TV:
http://www.shopjimmy.com/catalogsear.../?q=KDL-46xbr2

So I am sure where you get the word 'SIGNAL' board from.
Can we see the screen shot of the problem?

[Louis82]

Re: Sony Bravia no picture but backlight on

Hi. Can anybody explain the difference between signal board and main board?

I have this tv KDL46xbr2 white short (1/2 inch) horizontal white lines that appear and disapear on the whole screen. It does it on all input but it does not affect OSD (menu).

Deciding if this problem is on the signal board or main board.

I will appreciate any suggestion.

[ram_shan]

Re: Sony Bravia no picture but backlight on

Changing fuse or solder a picofuse over the old fuse is sufficient.

Cheers, Wizard

Wizard:

I apologize if you receive this twice but I am new to this forum and I am not sure if the first reply went through...

Your post 6+ years ago exactly describes my issue with my Sony KDL-46V5100 (TCON board 46NN_MB4C4Lv0.7 with LTY460HF07 LCD). It looks like the fuse blew yesterday based on my continuity check on the TCON board.

I am planning to solder another fuse on top of the blown fuse on the board per your suggestion. Do you know what fuse specifications I need? (amps and volts)

It looks like the markings on the fuse are "LF7A" which I think mean a 7 amp fuse from Littelfuse. The closest fuse I found at mouser.com is a 8 amp with 125 voltage rating. It is a NANO2 fuse not a PICO. Do you think this will be okay?

I appreciate your help as I am pretty new to this,
Ram

[static4real]

Re: Sony Bravia no picture but backlight on

T-CON is staring right at you. Right in middle at top hiding behind the vented cover with 4 little screws.

Do you have multi-meter? Take T-CON cover off and find a small SMD fuse and measure this first, tend to be very near the LVDS connector. You want very low ohms. If high ohms, bridge this old fuse with 2A picofuse secured with bit of soldering job on both ends. Take very clear picture of the exposed T-CON board.

Make sure T-CON have thermal pad atop the big square chip and any smaller ones if are there.

Cheers, Wizard

i have a bravia kdl 46w3000 with same issue. backlights are perfect, i hear sound from all ports but no picture at all. screen lights up and changes as i flip channels but there is no letters or words or numbering just a blank lit screen no matter what i do. i reseated all cables, tightened down screws, checked for bad caps and everything seems fine. what is the problem im having? sorry im not sure how to do this, its my first time ever using a forum in my life. hope i did this right

[kjcdal]

Re: Sony Bravia no picture but backlight on

hi hope someone can help i have a sony bravia kdl 40v2500, it swicthes on fine with steady green light and sound is perfect but no picture can hear channel change and volume works fine, you can also c the backlight on, i have changed the t con board and when i first done that and turned it on two white lines came up, turned the tv on and off again and the lines are now gone but still no picture the same as before so now am stuck dont know where to go have checked all wires and cracks and everything seemd fine so i hope someone can help thankyou.

[gt4rusty]

Re: Sony Bravia no picture but backlight on

I apologize I believe I am looking at a bad SMD resistor, not a bad capacitor. I mistakenly thought because of the "C" designation on the board that it may have been a cap.

[gt4rusty]

Re: Sony Bravia no picture but backlight on

I have a Sony KDL-52W4100 a little less than 2 years old. I turned it on and after 30 seconds heard a pop and the picture went out (back light still on) and the red LED flashed 14 times( Panel Error I believe). After reading through this and numerous other threads on the issue decided to look at the fuse on the TCON board. Before I even checked the fuse I found what appears to be a burnt capacitor (pictures attached). I have ordered a new board from Sony and have a couple of questions. Do you think this is an issue with the board, or should I check another component before putting the new board in only to have it happen again? I have seen that heat is a real issue with the board, is it OK to put heat sink grease on the pads to ensure better transfer or are they good enough as is?
Thanks for the information, I wouldn't have gotten this far with out it.

[PlainBill]

Re: Sony Bravia no picture but backlight on

hi could you help with problem below, Update sound works, no backlight, no video. thx Ps. my tv is a KDL 52X3500 AKA KDL 52XBR

I suggest you ask the guy who gave you the advice for help. I'm not experienced with panels at that depth. Since both the backlight and the panel do not work, you probably blew the main board.

PlainBill