Question about Sony BRAVIA KDL-32S2000 32 in. LCD HDTV

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Sony tv lcd emits too much heat - Sony BRAVIA KDL-32S2000 32 in. LCD HDTV

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Try turning down the backlight intensity

Posted on May 26, 2010

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I have a Vizio Power Supply Unit VX37L TV wont show the light on the front...


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 Nov 22, 2010 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

My Sony LCD model no CX52 There r white patches and background images are not visible Screen is full of pathes what to do


The LCD television is a flat-panel television which utilizes a Liquid Crystal Display technology. It has two layers of glass which are polarized and stuck together. The liquid crystals are held in one of the layers. These liquid crystals pass, or block the light, to produce images on the screen when the electric current passes through it.

However, the crystals do not produce their own light. The light comes from the series of fluorescent lamps at the back of the screen. There are millions of shutters arranged in a grid, which open and close to release and trap some of the light that is not needed to create images. Then each shutter is paired with a colored filter which produces a sub-pixel. These are so small, that when they combine, they create a single pixel, which appears to be a single spot of color on the screen. With the help of the fluorescent lamps, the images created by the liquid crystals become visible to the viewer.

LCD television produces high image quality. They can be made very thin, which makes them less space-consuming, and the user can hang them anywhere. This makes them appealing to buyers.

LED TV's are actually very much like LCD TV's. They also have a flat-screen which utilizes Liquid Crystal Display technology. The only difference is their source of light, which is at the back of the screen. The LCD TV uses fluorescent lamps, and the LED TV uses LED (Light Emitting Diodes).

There are two types of LED backlighting. One is referred to as Edge lighting, and the other is called Full-Array lighting. With the Edge lighting, the series of diodes are arranged along the outside edges of the screen. When there is power, the light is distributed across the screen. Alternatively, in Full-Array lighting, there are several rows of diodes behind the entire surface of the screen. They provide more control over brightness and dimming, because the diodes can be turned on and off independently.



LED TV's are LCD TV's with a new backlight system. They are newly developed for LCD's, because Light Emitting Diodes are said to give more balance in color saturation, and use less power than the fluorescent lamps. LED TV's are the newest version, and that's why they are currently more expensive than the standard LCD TV's.

Summary:

LED TV's are still LCD TV's. They are just considered to be the newer LCD TV version because of the new backlight system used. The LED TV uses Light Emitting Diodes, while the standard LCD TV uses fluorescent lamps. Although they both still use Liquid Crystal Display technology. The main difference is the part behind their screen, which is the backlight.


Read more: Difference Between LCD and LED Televisions ' Difference Between ' LCD vs LED Televisions http://www.differencebetween.net/object/difference-between-lcd-and-led-televisions/#ixzz2Bb0rIue6

Nov 08, 2012 | Televison & Video

2 Answers

My Vizio SV472XVT 47" HDTV


Unplug the TV from the wall. There must be something wrong with your circuit board. Call customer service for what to do to fix your TV or get a new one.

Mar 05, 2011 | Vizio SV472XVT 47 in. LCD HDTV

1 Answer

Blue dots all over screen


You need an optical block. PN: A-1132-202-A. Part is very expensive with a $1500 core charge. Consider replacing the TV. Sorry, this is will eventually happen to all Rear Projection LCD televisions. The UV light emitted from the projection lamp destroys the Blue LCD panel first (shorter wave length), then the Green then the Red. The panels are not serviceable, the entire unit must be changed. I hope this helps... it will save you a $100+ service call fee anyway.

Dec 03, 2010 | Sony KDF-E55A20 55 in. LCD Television

1 Answer

Yellow bloching on screen


Hi, Sorry but you need a new light engine. "optic block"Verry costly for Sony TV's It will get worse,turn green,or have blue near top or bottom. Caused by heat. Not dusting the back of the tv,and smoking in the house.The TV over heats and the LCD panels in the light engine have a polorised film that melts causing the colors.The part number is...A-1123-069-A
Part is $649.95 + $1300 core. I have several Sony LCD projection TV's at the shop with same problems.
Time to buy a Samsung LCD w/LED backlight. Best TV for the money.BUY A EXTEND WARENTY!!! No matter how good the TV is, They still break. Costly to repair. I do all the warenty work for Central Florida. So I know about how much you need one on these newer TV's. Sorry for the bad news. If I can help,contact me at...toddthetvmd@yahoo.com

Oct 31, 2009 | Sony KDF-E50A10 50 in. LCD HDTV

1 Answer

X2gen 19 inch monitor


It sounds like a heat problem in the monitor. It could also be a computer graphics problem. Leave either the computer or the monitor on for a while and then turn on the other device. try to discover which is needing to be warmed up. The buzzing and problems with the other RF devices around mean that the monitor or computer is emitting frequencies so it will affect the TV and maybe the computer. I found my computer emits these frequencies. I can't listen to AM radio when the computer is on.

Sep 03, 2008 | X2Gen MG19MY 19" LCD Monitor

2 Answers

Sony Bravia 40" LCD TV generating heat.


First, you will have to define what you mean by "hot to touch" ie.:
can you or can you not hold your hand on it for a few moments.

Apr 27, 2008 | Sony BRAVIA KDL-40V3000 Television

1 Answer

Ringing noise


try changing the cable going out of tv to the system for audio, make sure the cable from tv/sat receiver is in audio out and in dvd player in the Audio In under the Video 1 bracket, then when you turn on the system click function button on the front panel it will show Video 1 on the LCD and that should work.

Aug 19, 2007 | Sony DAV-FC9 System

3 Answers

MY TV has a blue cloud on the left side


Blue lcd is burnt up.. Normally happens due to excess heat from poor ventilation or not changing the lamp at the required time.. Allways happens on the blue as blue light is the hottest wave length, and as the lamp burns, it shifts to that side. Nothing you can do but replace the lcd itself. From the image shown, looks like the unit uses sony lcds.. Sonys are well known for there burns.. No quick fix on this one.

Jan 27, 2007 | LG RU52SZ30 52" Television

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