Question about Sony KP-61S65 61" Rear Projection Television

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Bad boards Where can i find replacements? Sony KP-61S65

Lots of bad connections around those crapy connectors that hook power supply to logic board. Need replacements. Can anyone help?

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Posted on Jan 14, 2010

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My Sony Bravia KDL-46V5100 will not turn on. No red light bottom left corner


Look in the circuit board area where the power cord mates with it for capacitors that have bulging tops (instead of the flat tops that are normal). If you see even one, you need to replace all the large capacitors othe power supply section (normally around 5 or 6).

Dec 08, 2014 | Sony Televison & Video

Tip

Basic LCD Monitors troubleshooting guides


By Bud Martin
First if you can, try the monitor with other PC first to make sure it is not the PC problem.
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.

The monitor will have at least 2 circuits boards, one board will be the logic board where the video cable from PC is attached to, the second board used in most monitors today is the Power supply/backlight inverter board combinations. Some monitors will have separate power supply module and backlight inverter board.
The monitor should be connected to the running PC otherwise it will go into standby mode.
The operations of each board:

1) The Power supply board:
It takes the 120vac 60Hz and converts it to high voltage DC (around 160~170vdc filtered by the 80~150uf 250~450vdc cap) by the bridge rectifiers to be used by the switching power supply circuits that converts this DC voltage into high frequency (around 50~100 KHz) AC for driving the step down transformer. The outputs (usually 2 outputs) of the transformer will be rectified by the diodes to produce the regulated 5vdc for the logic board, and regulated 12~20vdc (12vdc is usually for screen up to 17inch, 16~24vdc for 18~24 inch screen).

The power supply circuits are always on (unless the monitor uses the power switch that actually disconnects the power from the outlet which is rarely used these days) which means that it is running 24/7 using the monitor or not, any spikes and surge will be fed into the monitor power supply.

Common problems:
Blown fuses, bad caps (leaking/bulging tops or bottom seals, please note that bad cap may look normal but it can have high ESR (Equivalent Series Resistance). The DC filter cap should be low ESR type for using in the switching power supply; general purpose electrolytic types will not last very long in switching power supply circuits. Poor solder joints, over heated components.

Testing:
Plug the monitor in but do not activate the power switch so the backlight inverter circuits will be off. Check the 5vdc and the 12~24vdc to make sure they are OK. They should be tested with the load, you can use 6V 1A (6watts) lamp for the 5vdc, and car lamps such as 1157 (12v 8watts lo/26watts high) turn signal brake lamp using high filament connection for testing the 12~18vdc (or use two 1157 in series for 19~24vdc) for the backlight inverter circuits.
If the power supplies are working, the output voltages should be steady at the rated voltages. The power supply will go into shut down if it detects too much current draw due to false in the power supply or short circuits in the backlight inverter or in the logic board.

2) The backlight inverter circuits:
It takes the 12~24vdc and converts it to high frequency AC to drive the inverter transformers CCFL (Cold Cathode Fluorescent Lamp) assemblies. The transformers will drive the CCFL by applying the start up voltage (around 1500~2000v), when the CCFL start conducting, the voltage will drop down to about 500~800v.
The inverter has detection circuits to detect open circuit if the lamp is not attached or does not fire up after the start up voltage is applied, it will go into shut down. It will also shut down if the lamps draw too much current due to ages (when lamp gets old it will draw more current).
The inverter gets two signals from the logic board, one is the backlight ON/OFF signal, the other one is the Dimming signal for the lamps.
Common problems:
Bad filter caps, resonant caps (in the inverter output circuits), blown transistors/IC, shorted or open transformer winding.
Testing:
You should have spare lamps for testing the inverter circuits.

3) Logic board:
The logic board get the signals from the VGA (ANALOG) or DVI (DIGITAL) and processes them and feed them to the LCD panel T-CON (Timing Controller) board on the back of the LCD panel.
It also sends out two signals (backlight ON/OFF and Dimming) to the inverter circuits when the monitor is on and getting the signals from the PC.
If the logic board does not get the signal from the PC, it will put monitor into standby mode.
The 5vdc feeding it is converted to 3.3v, 1.8vdc by the switching buck converters to run the processor.
The logic board also sends the 5vd or 12vdc power for the T-CON board, if the voltage is not there, you will see white/grey glowing screen only.
Not much repair you can do on the logic board unless you have the full service manual and surface mount repair station.

4) CCFL and Inverter circuits testing:
If you don not have the inverter and lamp tester boxes you may be able to do a simple test by using these steps:
If the screen flashes on for a second, you can disconnect all the lamp connectors and connect it into one of the transformer output connector and see if you will see the flash on the screen, if you do, then try it with another transformer output connector to see if it also get the flash on the screen.
Repeat the procedure with other 3 lamps. If all the lamps do flash on for seconds then more likely the lamps are OK. If lamp only flash on one of the transformer output then you will know that the problem in that transformer inverter circuits.
If none of the lamps flash at all then the problem is in the inverter circuits, power supply, or not getting the on signal from the logic board.

Bad caps
http://i.fixya.nethttp://i.fixya.nete17e9cc.jpg

Power supply/inverter board (L), Logic bd. (R)
http://i.fixya.nethttp://i.fixya.netbc19983.jpg'

Dead T-CON bd, blown fuse. Get glowing screen only.
http://i.fixya.nethttp://i.fixya.net4fbd9e1.jpg

T-CON board's fuse F101
http://i.fixya.nethttp://i.fixya.net8506e44.jpg

Inverter board surface mounted fuses, F1 and F2

http://i.fixya.nethttp://i.fixya.net1bf6596.jpg
Bad lamps (Blackened ends, burnt /poor soldering)

http://i.fixya.nethttp://i.fixya.net5c8952e.jpg

http://i.fixya.nethttp://i.fixya.net4e5e9a1.jpg

Bad LCD panel (solid vertical lines)

http://i.fixya.nethttp://i.fixya.netffe90fe.jpg

Bad LCD panel due to bad T-CON board
http://i.fixya.nethttp://i.fixya.netef48b18.jpg
Failed TV and Monitors:
http://s807.photobucket.com/albums/yy352/budm
http://en.wikipedia.org/wiki/Capacitor_plague
Make your own test lamps: http://www.badcaps.net/forum/showthread.php?t=19987

on Sep 25, 2010 | Computers & Internet

1 Answer

How can I remove the screen to gain access to the guns and mirrors of my Sony KP-61S65 for cleaning?


all i do is unscrew the back 3 boards then pull the mirror out then there is plenty of room to work

Apr 09, 2011 | Sony KP-61S65 61" Rear Projection...

1 Answer

My VP504fhdtv10a vizio plasma TV when connect power cord the Vizio in front light up yellow/amber but will not turn on. I have replace Logic Control D Board still have same problem. I do research online...


Logic Control D Board got nothing to do with this problem. This is your main power supply gone bad(usually not the sub power supply). I just repaired my VIZIO by replacing main power supply. Just remove back cover and your board will be right in the middle of the screen. Just get board part/serial # and google it. My best price was through eBay(around $100). Everything is fine now.

Nov 07, 2010 | Vizio VP504F 50 in. Plasma HDTV

2 Answers

We have a Sony Bravia 40'' LCD that the screen went white and then black and won't come back on. The power button comes on but no picture. Just bought the TV in Nov 2009


the most likely the t-connector board became unplugged or failed completely (sits right behind the screen modual at the top&center) or.. the logic board has went kaput on ya...ontop of that, you are dealing with the notorious sony. try and get a replacement if under warranty. do not settle for thier refurbishing.

repairing these things i can tell you , it could be anything from a bad connection or ring cracks to completely failed parts. but only if i was in it would i know for sure. but the symptoms suggest t-connector or the logic board.

Feb 15, 2010 | Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

1 Answer

The power safety fuse was blown. I replaced it but everytime I plug the TV, it blows the fuse. It is a Sony projection HDTV


When fuse blows again and again that means power supply is bad and needs to be replaced.
Let me know exact model of your Sony TV to provide you power supply board part number info.


Nov 03, 2009 | Sony KP-51WS510 51" Rear Projection...

1 Answer

I just started to have picture problems with my sony kp-61s65 tv. the picture looks double and the top and bottom of the picture is oval. It is something that i can do or replace to fix it?


This model was was made around 1999 and most of the Sony sets use two STK-392-560 OR two of the STK-392-110 CONVERGENCE CHIPS.

The chips are located on two metal heat sinks with fins and usually are on the board on the far left as you look from the back of the TV.

They will be black in color--about 2 and 1/2 inches wide by 1 and 1/2 inches tall and black in color--they will have the STK full number printed on them in white.

A pair of either chips can be bought on Ebay for about 12 dollars plus shipping----there are several fuses that do not look like fuses that protect them--two are on the power board and the rest are around the chips.


What needs to be done here if convergence is bowed and or will not adjust---both chips and any other bad parts--fuses etc need to be located and replaced---usual parts cost is under 30 dollars.

The board will have to be removed from the frame to get at them and they and the fuses are soldered in---you need to be able to solder etc.


If you can do the repair or know a friend who can do it for you -----you can save the set and a lot of money

Most shops are going to get 300 or more for this type of repair.

I know as I have done hundreds of these sets with convergence problems---

I am here to help people---I do this here for free--if you have questions or need advice let me know.

Regards, SD TECH

Oct 31, 2009 | Sony KP-61S65 61" Rear Projection...

1 Answer

SOUND BUT NO PICTURE WHEN DVD IS PLAYING


Need to check an av switching ic. Make sure you got the 12v going to the ic, if missing troublle shoot power supply. If it is there, bad ic. Or if it is low, unsolder vcc pin and check for right voltage to see if the ic is bringing down the voltage.

Aug 31, 2009 | Sony KP-46V35 TV

1 Answer

My kyocera km-1500 , i am erreur c6 400 blinking i need help , thank's


Check the connection of connectors YC7
on the engine board (KP-5061) and CN2
on the power supply board (KP-5059), and
the continuity across the connector terminals.
Repair or replace the engine controll board or the power supply if necessary.

Jul 28, 2009 | Kyocera KM-1505 Copier

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