Question about Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

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Sony Bravia KDL-40V2500 40" lcd hdtv

The left hand side of the screen has gone dark red to almost black almost 3/4's of the way across. It's just over a year old.

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  • deelipp Nov 10, 2008

    Thank you for your "bad news"....we appreciate the feedback from someone who's seen this before. When this amount of money is spent we certainly expect it to work for more than 14 months so hopefully we'll come to some agreement with Sony about this problem.
    Thanks for your help.


  • Tedschiavo Dec 06, 2008

    I have this exact same issue, with my 46" X series. It's 5 months old or thereabouts. It did it a week ago when I turned it on after work one night, came good after about 5 minutes, then was fine every time I have turned it on until today. I have turned it on three times during the day and it has been like this. Roughly 3/4 of the screen, from the left hand side across, is very dark, tinted red, and has very very bad image trailing. After some time (varies from 5 to 25 min so far) it will lighten back up, go back to normal colours, but there is horizontal lines through the whole image top to bottom (again, the far right portion of the screen remains fine). While it is like this it will occasionally 'flicker' up and down, almost like the vertical hold on an old VCR, with the original image still visable, but a second (and when it is at it's worst 3rd, 4th or even 5th) skewed semi transparent version of the image flickers up and down over it rapidly for a second or so. The frequency increases bit but bit up until the picture suddenly snaps back to normal.
    I am very worried, it is still basically a brand new TV.

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I risk getting a bad rating from you, but it sounds as though you have a bad LCD panel. I have seen sections of the panels fair, usually caused by a separation of the ribbons connecting to the panel itself or a bad TCON board (the board that addresses the pixels. It is part of the panel on Sony TV's). Your best bet is to contact Sony customer service at 800-222-SONY to see if they will work out some kind of accommodation on the repair, like possibly covering the parts or splitting the repair costs with you. I hope I have provided you with good information and you do not rate me poorly for your bad news.

Posted on Nov 10, 2008

  • Any Guy
    Any Guy Nov 10, 2008

    You're welcome for the help. Could you rate the solution please? Thanks!

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Portion of the screen is very dark, gets better after 20 minutes


Your LCD panel has failed, it will be cheaper to get a new set. If I have helped you please sign my guest book

http://www.back2lifeelectronics.com/Guestbook.php

Apr 17, 2014 | Sony Bravia XBR-Series KDL-46XBR4 46-Inch...

Tip

Ive got an LG 37" lcd hdtv model number 42pc3dv-uda1. when the tv is turned on...


This is the basic guide that can be applied to most LCD flat panel TV.
By Bud Martin
First, try unplugging it from the outlet for about an hour to see if the TV will reset itself since the minute the TV is plugged into the wall, the power supply and processor will be running 24/7 and the EPROM can get corrupted by spikes and surges. Try using good quality surge suppressor to see if it will help if it happen often.
Look for burnt brown hot spots on the circuit boards, capacitors with leaking/bulging top or seals. Loose wires and connectors. Blown fuses.
Notes: We are dealing with high voltage that can kill you! so if you are not sure what you are doing, please have it fixed by the pro that has proper tools and safety equipment. Try to use GFI outlet and isolation transformer when work around the TV set and DO NOT DEFEAT THE GROUND PIN OF THE OUTLET/POWER CORD.

1) The power supply module (There are 4 regulated output voltages:- Standby 5vdc, switched 5vdc, 12~16vdc, and 24vdc).

The power supply converts the 120/230vac 50/60Hz into DC, then the high frequency (50~100kHz) switching circuits convert it back to AC but at high frequency which allows the power supply to use smaller and much lighter weight transformers (Ferrite core instead of heavy iron core), then this high frequency AC voltage is fed to the rectifier Diodes to get the DC output and filtered by DC filter capacitors that must have low ESR (Equivalent Series Resistance), if general purpose electrolytic caps are use, they will fail within a year or less due to high ESR.

The power supply has Standby 5vdc (5VSB, this is a MUST have before anything else will work, when this voltage is not present, there will be no any indicator light on the front panel) which is always on the minute the TV is plugged into the AC outlet, so it is on 24/7 and that is why the power supply will fail even though you may use the a TV not very often. It will see all the voltage spikes and surges 24/7.
This 5vdc is used to power the Processor and the Infrared remote receiver module which will be waiting for the command from the remote control or from the power switch, when the Power on command is received, the Processor will send the turn on signal (3.3~5vdc) to the power supply module (PSON pin) to the switch on the main 5vdc for the rest of the logic and Tuner circuits, 12~16vdc for the sound amplifiers (mostly Class D amplifier for efficiency and small size) and for the T-CON board (interface board between the LCD panel, some T-CON uses 5vdc, and the Logic board), and 24vdc for the Back lights inverter board (if there is no 24vdc then no back light).
Common failures:
Blown main AC fuse due to shorted out Diodes, transistors.
Bad capacitors leaking or bulging tops:
Shorted Diodes, transistors in the DC output side.

Testing the power supply output with dummy load:
24vdc testing: Disconnect the wires that go to the inverter board first. You can use two #1157 (using both Lo & Hi filaments by paralleling them at the base) car light bulbs connected in series so they can handle the 24vdc, this will put light load (about 70w) on the 24vdc output, the voltage out should be steady at 24vdc (+/-2v), if not, the power supply has regulation problem.
12vdc testing: disconnect the 12vdc TV load from the power supply board and attach one #1157 (using just the Hi filament), the 12vdc output should stay at 12v (+/-1v), if not, the power supply has regulation problem.

You should see the lamps go on when the TV power switch is ON and go OFF when the TV is powered OFF.

2) Main Logic board (It has Processor, Tuner, Sound Processor, Sources selector, Power amplifiers for speakers, interface port to the T-CON board for pictures).
This logic board sends out the turn on signals (3.3~5vdc) to turn on the rest of the Power supply module (Switched main 5vdc, 12~16vdc, and 24vdc), Inverter backlight ON (if no back light on command then there is no back lights),
Logic board supplies 5 or 12vdc to T-CON board B+ pin through switched transistor if T-CON board does not get the voltage from the logic board, you will get white/gray glowing screen without pictures.
Back lights Dimming (PWM) control signal.

3) Back lights Inverter board. Its job is to provide the drive voltage for the CCFL (Cold Cathode Fluorescent Lamp) to give white light for the screen.
This board is fed by the switched 24vdc (VBL) from the power supply module, it also get the Back lights on (BL on) control signal and the Dimming (Dim/PWM/) signal from the logic board. So for it to work, it needs 24vdc and the BL_ON signal.
Common failures:
Blown surface mounted fuses due to shorted transistors/ICs, Transformers.
Bad capacitors.

4) The T-CON (Timing Control or LCD controller) board (on the LCD panel assembly). It transfer the universal image signal of TTL and LVDS signal to specific TFT (Thin Film Transistor) LCD.
This is the interface board that talks to the Logic board and the LCD panel to produce pictures on the screen. White/gray glowing screen when it fails or not getting the voltage from the logic board (the 5 or 12vdc is supplied by switched transistor on the logic board). Notes: T-CON board is mounted under the metal cover shield.
Common failures:
Scrambled pictures, Lines, multiple pictures, color smears/blotches, rolling pictures after warm up.
Blown surface mounted fuse.
No pictures, very dark screen almost like there is no backlights.

5) LCD panel assembly to display pictures. The LCD pixels will block or unblock the back lights from the back of the panel to the front of the panel. This is the most expensive part of the TV, it will be more than the TV is worth.

As you can see, you must have all the above Voltages and signals for the TV to work properly. This may help you narrowing down the bad modules instead of buying the wrong module just to find out later that it did not solve the problem. Hope this will help you out.

Sound problem:
Let verify first to narrow down to where the problem can be. First, check the on screen sound set up menu to make sure the speakers are not set to OFF. If the setting is OK, then attach the powered PC speakers to the Audio Line out RCA jacks to see if you can get the sound there, if you do, then the problem can be in the power amp circuits, if you do not get the sound at RCA jacks, then the problem can be in the sound processor circuit. To get the sound repair, it can be from $150 and up, so if you can put up with using the good set of Powered PC speakers which actually give better sound than the tiny speakers inside the TV, I would keep using it that way, you may want to find out if the on screen sound setup will allow you to set the audio line out to be VARIABLE which means the sound output feeding the PC speakers can be varied using the TV remote control, then all you have to do is to set the PC volume to about half way up and set the TV volume to what ever you want.

Inverter board connector: you can also see the Fuse 4A/160V
http://i.fixya.nethttp://i.fixya.net13ca788.jpg
Power supply connector:
http://i.fixya.nethttp://i.fixya.net78e0d9a.jpg

http://i.fixya.nethttp://i.fixya.net2fc510f.jpg
T-CON board: (metal cover shielding is removed to show the bd.)
http://i.fixya.nethttp://i.fixya.net0b5367e.jpg
Inverter board:
http://i.fixya.nethttp://i.fixya.netaf0a695.jpg
Logic board:
http://i.fixya.nethttp://i.fixya.net4bd108e.jpg
T-CON board is dead, no power or blown fuse on the board, screen turns WHITE, must see it in darkened room, otherwise you may mistaken it for failed backlight.
http://i.fixya.nethttp://i.fixya.net3a91b68.jpg
Bad T-CON board after warm up, you get lines, multiple pictures, strange colors blotches, etc.
http://i.fixya.nethttp://i.fixya.netd3cf194.jpg
Bad caps (leaking/bulging tops). Make sure to replace bad cap with good cap such as PANASONIC FM or FC series , they are Low ESR (Equivalent Series Resistance) which is a must for switch mode power supply, and 105c rating. Do not use generic electrolytic caps.
http://en.wikipedia.org/wiki/Capacitor_plague

http://i.fixya.nethttp://i.fixya.netbe827ec.jpg
Bad T-CON board or power supply problem

http://i.fixya.nethttp://i.fixya.net034e1db.jpg

24vdc power supply output testing using two 12vdc car lamps in series.

http://i.fixya.nethttp://i.fixya.net4f2929c.jpg
Bad LCD panel, vertical 1~2 pixel wide lines
http://i.fixya.nethttp://i.fixya.net28e50c1.jpg
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm

Free service manuals: www.elektrotanya.com

on Dec 02, 2010 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

My sony bravia had two thirds of right side was very dark it used to fix itself in about twenty minutes. I replaced the t-con board no change. Than i removed one of the four connectors to screen but left...


would say that the screen lights have gone. usually they flicker for a while then come on. then off etc. more than half the screen has gone so the power from the inverter is not being used so it turns off the tv. it is a very fiddly job replacing them as you can damage the screen in the process. more easyer just to get a new screen.

Oct 02, 2013 | Sony BRAVIA KDL-46XBR2 46 in. LCD HDTV

1 Answer

Sony KDL-40Z4100 standby light solid red, orange blinks every 4 sec, What part may have gone bad?


The red stand by indicates the set is in PC stand by the blinking orange timer is indicating the timer has been set or has an issue

Mar 13, 2012 | Sony Bravia KDL-40V4100 40 in. LCD HDTV

1 Answer

We have a sony bravia 46" tv. Model number KDL-46W4150. It is 2 years old and has now developed black lines on the right side of the picture.It goes half way across the screen. It is like this when...


That sounds correct, I just have to work on SONY BRAVIA KDL-40BR4 with Horizontal lines problem on ther right side, you you tap around the frame, the lines will come and go, this is only 2 years old TV! Poor quality panel made by SONY/SAMSUNG company jointed venture.
Very sad indeed when you paid for BRAVIA series which are not cheap.
New screen will cost more than new TV.
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Feb 15, 2011 | Sony BRAVIA W-Series KDL-46W4150 46 in....

1 Answer

I have a sony Bravia KDL-52W3000 LCD tv. Approx.


I have the same tv with the same problem. My tv is about 3 1/2 years old. I took it to the shop yesterday and today they told me that I had a bad lcd panel and a bad FL1 circuit board. They also told me it was going to be $3800.00 dollars to fix. I am now on my way to buy another tv, needless to say it will not be a Sony. Sony knows about this problem and refuse to do anything about it. Good luck.

Nov 26, 2009 | Sony BRAVIA KDL-52W3000 52 in. LCD...

1 Answer

I have a Sony Bravia KDL-46Z4100 46' I have a green vertical line on left side of screen


this is probly the lcd control module unfortunatley it comes with a new lcd panel
change these.

Mar 10, 2009 | Sony BRAVIA XBR KDL-V26XBR1 26 in. LCD...

1 Answer

No picture


is this something to do with the sleep timer?

Apr 03, 2008 | Sony BRAVIA KDL-40S2000 40 in. LCD HDTV

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