Joined: Jun 02, 2007
Posts: 23
From: West Jordan City
Posted: 2012-03-20 10:08
when I power up the TV I get the green power light and the screen lights up for about 1 second. I have noticed that the top right part of the screen is dark. to test I disconnected the right set of inverters and powered on the tv. the tv powered up and stayed on. I have ordered the defective side and will let you know if that fixes the TV.
Joined: Mar 23, 2012
Posts: 10
From: United States
Posted: 2012-03-23 08:26
JEHILL
It seems like you are a very knowledgeable person on these forms. I have a Sony KDL-40S2000. First time ever I have issues with it. Standby light is blinking 3 times. I'd rather not call a service repairmen becasue i'm sure this is extrememly expensive and wondered if you thought this was fixable.
I downloaded the manual last night and have not done any self-diagnostic type test. Would just love to hear your thoughts on this.
Joined: Mar 13, 2003
Posts: 13792
From: Sewell, NJ
Posted: 2012-03-23 09:24
My knowledge is limited to what I can determine from Sony sources. Currently, that is limited to TV service manuals. All that I can tell you is what 3 blinks means. Unfortunately, I won't have access to the service manuals until Tuesday.
Joined: Mar 23, 2012
Posts: 10
From: United States
Posted: 2012-03-23 10:10
That would be very helpful. In the meantime this weekend, i'll try to do what the manual called some type of diagnostic testing to see if it shows any more codes.
I look forward to hearing from you Tuesday. Thanks so much for your help! Jason
Member Quote
On 2012-03-23 09:24, jehill wrote: My knowledge is limited to what I can determine from Sony sources. Currently, that is limited to TV service manuals. All that I can tell you is what 3 blinks means. Unfortunately, I won't have access to the service manuals until Tuesday.
DC_ALERT 1. This protection mode is activated if any one of the following regulators failures.
•
IC7001 3.3V Regulator
•
IC7002 1.8V Regulator
•
IC7004 2.4V Regulator
Each regulator output is monitored by a transistor and a diode. IC7001 is monitored by Q7504 and D7508; IC7002 is monitored by Q7506 and D7510; IC7004 is monitored by Q7505 and D7509. The transistors are ON in normal operation, turned ON by the voltage output of each regulator. With the transistors ON a ground is applied to the anode of each diode, therefore, each diode is OFF (or reverse biased). All three diode outputs go to the base of a single transistor Q7503. The collector of Q7503 is connected directly to the Main Microprocessor IC1010/pin 163.
In normal operation the voltage level at IC1001/pin 163 is 3.1V. If any of the three regulators failure the corresponding transistor (Q7504, Q7505, or Q7506) will turn OFF, and the ground is removed from the anode of the corresponding diode (D7508, D7509, or D7510). With the ground removed a high will be applied to the anode of the diode through the associated pull-up resistor (R7542, R7543, R7544), and the diode will forward bias, applying a high to the base of Q7503. The transistor turns ON applying a ground to IC1001/pin 163 pulling the pin low. Consequently, the Main Microprocessor detects a regulator failure and the RED Standby-LED flashes a 3X pattern and the TV shuts down.
3.3V & 1.8V Low-Voltage Protection (3X)
Reference Figures 3-1, 3-2, and 2-1
There are four failures that will cause a 3X protection mode state (all located on the BU-Board), and they are as follows.
•
Open F7000
•
Defective 3.3V Regulator IC7001 (TP3)
•
Defective 1.8V Regulator IC7002 (TP2)
•
Defective 2.4V Regulator IC7004 (TP4)
If 0V is present at any of the regulator output test points or if F7000 is open, then replace the defective component or the BU-Board.
If F7000 and all voltages (3.3V, 2.4V, and 1.8V) at the test points check OK and the TV still shuts down (3X), then a component in the protection circuit (Q7504, Q7505, Q7506, Q7503, D7508, D7509, and D7510) itself may have failed.
Check for the presence of 3.1V at IC1001/pin 163. If 3.1V is present at CN1001/pin163, then the regulators and protection circuits are working properly. The failure is most likely the Main Microprocessor; it is not processing the DC ALERT 1 signal properly. Replace the BU-Board.
[ This message was edited by: ntehicks on 2012-03-23 17:35 ]
Joined: Mar 23, 2012
Posts: 10
From: United States
Posted: 2012-03-28 09:54
I'm glad I turned my TV back on to double-check this. I found out my light is blinking 4 times instead of 3. I'm totally new to any of this type stuff. I have a Sony KDL-40S2000. If anyone can walk me through exactly what I need to do, I would GREATLY appreciate it!!
Joined: Mar 13, 2003
Posts: 13792
From: Sewell, NJ
Posted: 2012-03-28 11:17
For the KDL40S2000, 4 blinks, pause, 4 blinks, etc. means "Backlight Failure". No further detail is provided in the service manual; however, ntehicks may be able to provide further insight from the training manual that he has.
Joined: Jun 02, 2007
Posts: 23
From: West Jordan City
Posted: 2012-03-28 21:08
when you turn on your TV does it light up for a second before it goes to the blinking light? if so look and see if it is the top that is lighting up or the bottom half of the screen. the 4 blinks is exactly what my tv was doing so I replaced the inverter board and now it works.
The mechanism used for backlight detection is as follows:
When the TV is switched on, the green LED will light and the main power supply is switched on by the microprocessor. In this situation the supply voltage to the inverter(s) for the CCFL's is available.
Then the microprocessor sends a signal to the inverter(s) to switch on.
Then the inverter(s) start to generate the high-voltage which is fed to the CCFL's.
Each CCFL ignites and draw a certain amount of current.
The current each CCFL consumes is monitored by a separate current detector. If the current is lower then a predefined value, the current detector outputs an error.
All outputs of these current detectors are summed in a way that if one or more current detectors report an error this will be forwarded to the microprocessor.
If the microprocessor receives this signal, it will switch off the main power supply and let the red LED blink in a specific pattern. (For most sets this is 4 times, but that differs from model to model.)
If the error for backlight is displayed, this could have several reasons:
- defective inverter - defective or mechanically broken CCFL - unplugged connector - defective power supply board - defective main board
Joined: Mar 23, 2012
Posts: 10
From: United States
Posted: 2012-04-02 07:56
The TV lights up, then goes back and forth top and bottom before it goes out and starts blinking 4 times.
Member Quote
On 2012-03-28 11:17, jehill wrote: For the KDL40S2000, 4 blinks, pause, 4 blinks, etc. means "Backlight Failure". No further detail is provided in the service manual; however, ntehicks may be able to provide further insight from the training manual that he has.
Joined: Mar 23, 2012
Posts: 10
From: United States
Posted: 2012-04-02 07:57
Thanks for the reply. The TV lights up, then goes back and forth top and bottom before it goes out and starts blinking 4 times.
it appears everything lights up, and then the top lights up just a split second while the bottom goes dark. It does all this in a matter of a split second. I tried to record it, but it just wouldn't pick it up.
If you feel it's an Inverter Board, can you point me where I need to get that for my 40KDL. I wouldn't have a clue on fixing this.
thanks Jason
Member Quote
On 2012-03-28 21:08, ntehicks wrote: when you turn on your TV does it light up for a second before it goes to the blinking light? if so look and see if it is the top that is lighting up or the bottom half of the screen. the 4 blinks is exactly what my tv was doing so I replaced the inverter board and now it works.
Joined: Jun 02, 2007
Posts: 23
From: West Jordan City
Posted: 2012-04-02 12:06
I purchased my inverter online. you can get them several places. just google the part number that is on the board in your TV. I like to get the parts that have atleast a 30 to 60 day warranty. I do believe that the 40" only has inverters on one side. my 46" had them on both sides. If you click on this link a go to the bottom of the thread there is two links of which one of them will be a service bulletin from sony. http://www.avsforum.com/avs-vb/showthread.php?t=930762
[ This message was edited by: ntehicks on 2012-04-02 12:08 ]
[ This message was edited by: ntehicks on 2012-04-02 12:10 ]
Joined: Mar 23, 2012
Posts: 10
From: United States
Posted: 2012-04-02 12:59
As a premium member, are you able to message me? Of course I can't to you. If you can, please message me your email address. thank you for your help! Jason
Member Quote
On 2012-04-02 12:06, ntehicks wrote: I purchased my inverter online. you can get them several places. just google the part number that is on the board in your TV. I like to get the parts that have atleast a 30 to 60 day warranty. I do believe that the 40" only has inverters on one side. my 46" had them on both sides. If you click on this link a go to the bottom of the thread there is two links of which one of them will be a service bulletin from sony. http://www.avsforum.com/avs-vb/showthread.php?t=930762
[ This message was edited by: ntehicks on 2012-04-02 12:08 ]
[ This message was edited by: ntehicks on 2012-04-02 12:10 ]
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