Sony KDL-40W2000 3 LED Blnks Error

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

VC1 cannot be 330VDC, the filter cap C6105 connected to pin 8 VC1 is only 50V cap. https://www.badcaps.net/forum/attach...5&d=1565389163
But right now at least we know that 3.3V power supply is steady.

He's using chassis ground not HOT ground to measure the voltage.

According to poster, he used the "negative leg of the main filter cap for ease of access". I have doubt now about the data we are getting.

Ok Budm I shall try putting the NEG lead of DMM on the Heatsink of the HOT side and remeasure VC1 pin to clarify this, I took your advice to measure from the area you referred to in previous post as I didnt have access from the top of the board I used the point in my pic to show this. I must have misread this and was taking measurement from the Chassis GND and not the HOT side like R_J quotes above my bad I will try sort this out tonight and update my results. Thanks for your help.
I have attached a small illustration to clarify I a going to be taking my measurements from the correct area of the board.

[Brucetafer]

Re: Sony KDL-40W2000 3 LED Blnks Error

OK, I just dealt with this myself the SONY 3 blink power supply IMMEDIATELY goes into safe mode when the main board is bad. I think he's having issues exactly the same reason I did. the big click then click and 3 blinks, its sending the power supply into safe mode and shutting it down.. when you unplug the power supply from the main board it does NOT turn on anything like most boards.. I was going crazy over this for almost a week..

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

Hi Standby pin HAS steady 3.3v with PSU to Mainboard cable connected or disconnected. (CN6200)


I can confirm the standby voltage stays steady at 3.3v.

Measured:
VSEN pin 1 = confirmed 330vdc
VC1 pin 8 = 330vdc
Both measurements taken from hot side after negative leg of the main filter cap for ease of access.

Thanks for your help on and hope these results I have gathered now make more sense.

According to poster, he used the "negative leg of the main filter cap for ease of access". I have doubt now about the data we are getting.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Be VERY CAREFUL when working on the hot side some voltages can be DEADLY, just a warning for those following that my not be aware.

[R_J]

Re: Sony KDL-40W2000 3 LED Blnks Error

He's using chassis ground not HOT ground to measure the voltage.

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

Hi Standby pin HAS steady 3.3v with PSU to Mainboard cable connected or disconnected. (CN6200)

I can confirm the standby voltage stays steady at 3.3v.
Measured:
VSEN pin 1 = confirmed 330vdc
VC1 pin 8 = 330vdc
Both measurements taken from hot side after negative leg of the main filter cap for ease of access.

Thanks for your help on and hope these results I have gathered now make more sense.

VC1 cannot be 330VDC, the filter cap C6105 connected to pin 8 VC1 is only 50V cap. https://www.badcaps.net/forum/attach...5&d=1565389163
But right now at least we know that 3.3V power supply is steady.

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

The request is SIMPLE, just measure the standby pin, if it's not as expected unplug cable from power board to mainboard, then measure again, see if it's as expected. You can also unplug everything from powerboard just plug in power cord and see what you have at standby pin, this will be your starting point.

Hi Standby pin HAS steady 3.3v with PSU to Mainboard cable connected or disconnected. (CN6200)

In your post #8 ...
So the question is, is the 3.3VSTBY always stay at 3.3V or it drops to 0V with or without having main board connected?
So keep meter probes on chassis and 3.3V STBY pin and tell us if it is going up and down or not.

I can confirm the standby voltage stays steady at 3.3v.

That is what I am trying to find out if the 3.3V STBY is dropping in and out or what, OP said he gets 0V on 3.3V STBY then the main board will not have any power to run it to produce error code if 3.3VSTBY is not present. Trying to get the answer from OP.

"I can't get a reading from the IC as it cuts to the error mode too quick."
0V on all the pins?
VSEN cannot be 0V since it is connected to the main filter cap via resistors that has 330VDC in standby.
VC1 will be 0V if PS-ON is not present, VC1 is generated by the 3.3V STBY AUX winding of the 3.3VSTBY SMPS transformer.
Did you us chassis GND of HOT SIDE circuit ground which will be the negative leg of the main filter cap in the hot side.

Measured:
VSEN pin 1 = confirmed 330vdc
VC1 pin 8 = 330vdc
Both measurements taken from hot side after negative leg of the main filter cap for ease of access.

Thanks for your help on and hope these results I have gathered now make more sense.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Ok, I don't know about every singe one but most powerboards I've messed with when working properly, have a steady as expected standby voltage when testing the board with nothing else connected.

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

The request is SIMPLE, just measure the standby pin, if it's not as expected unplug cable from power board to mainboard, then measure again, see if it's as expected. You can also unplug everything from powerboard just plug in power cord and see what you have at standby pin, this will be your starting point.

Thanks for your input nomoresonys I shall give this a go soon as I can.

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

There may be a problem with the panel, check if you have +5v on the t-con, Also disconnect the lvds cable between the t-con and the main and see if you get the same error.

Service manual:
https://www.manualslib.com/download/...l-40w2000.html
Error code 3-blink:
3 ) UNREG10.5V, PANEL5V Voltage Trouble (DCALERT
So perform test as RJ suggested.

Could someone point me in the direction of where to take this measurement, would the fuse on the tcon be ok or is there a specific area to measure I can have my probe on it and power the tv up to see if the voltage might be present just before if trips to error mode. A screen grab of the schematic or component ID would be great thanks guys.

S.

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

The request is SIMPLE, just measure the standby pin, if it's not as expected unplug cable from power board to mainboard, then measure again, see if it's as expected. You can also unplug everything from powerboard just plug in power cord and see what you have at standby pin, this will be your starting point.

[StephenU]

Re: Sony KDL-40W2000 3 LED Blnks Error

Hi everyone, sorry about the lack of input was away on a course with my work. Anyway if we disregard the OP part "I have attached a pic of connector CN6200 as I took some measurements from it but no voltages were present with the connector seated or unseated." I had been trying to take measurements when error had tripped the supply, This is where I am at the moment with the TV.
All connection in place and Voltage readings from the CN6200 are present - I can only get these measurements when I apply power and the relay clicks as to try and start the TV up, so I've had to keep doing this to get the readings, when the tv goes into the error mode and as soon as it does I lose all voltages. At one point when measuring the standby voltage I was getting solid 3.3v then it would drop and come back up this was when in error mode.

I have removed the power board and gave it a good visual inspection top and bottom side, no dry solder joints and no cracked / damaged parts or areas of PCB.


I will go through all replies as soon as I can get the time to get the TV opened and measurement took.

Thanks for all the input on this.

S.

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

"I can’t get a reading from the IC as it cuts to the error mode too quick."
0V on all the pins?
VSEN cannot be 0V since it is connected to the main filter cap via resistors that has 330VDC in standby.
VC1 will be 0V if PS-ON is not present, VC1 is generated by the 3.3V STBY AUX winding of the 3.3VSTBY SMPS transformer.
Did you us chassis GND of HOT SIDE circuit ground which will be the negative leg of the main filter cap in the hot side.

[Diah]

Re: Sony KDL-40W2000 3 LED Blnks Error

Post #32:
"I can't get a reading from the IC as it cuts to the error mode too quick."
Which IC, which pin?

i gave answer as i thought his write belong on my question on this post

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

Post #32:
"I can’t get a reading from the IC as it cuts to the error mode too quick."
Which IC, which pin?

[nomoresonys]

Re: Sony KDL-40W2000 3 LED Blnks Error

Check those solder joints on powerboard with a big ass magnifying glass.

[Diah]

Re: Sony KDL-40W2000 3 LED Blnks Error

That is what I am trying to find out if the 3.3V STBY is dropping in and out or what, OP said he gets 0V on 3.3V STBY then the main board will not have any power to run it to produce error code if 3.3VSTBY is not present. Trying to get the answer from OP.

´
this is the answer

I can't get a reading from the IC as it cuts to the error mode too quick

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

That is what I am trying to find out if the 3.3V STBY is dropping in and out or what, OP said he gets 0V on 3.3V STBY then the main board will not have any power to run it to produce error code if 3.3VSTBY is not present. Trying to get the answer from OP.

[R_J]

Re: Sony KDL-40W2000 3 LED Blnks Error

I think he is refering to the fact that there are two operational sections on some of these models, One is for the digital part and one is for the analogue. and they have seperate service menu's. I have seen a kdl46S2000 that will cycle on and off if set to the only hdmi input. It also will not program or receive any digital tuner channels, other than that the analogue part the tv works perfect.
That said, none of the tv will operate if there is no standby voltage.

When the tv quit, what input was it on? You can try disconnecting the flat white cable between the main board and the FEE board (with the card slot) and see if the tv stays on.

[budm]

Re: Sony KDL-40W2000 3 LED Blnks Error

In your post #8 "Gettting ~240v on both sides of the fuse - What i don't get is I get nothing on the standby 3v3 pin and i have a Red standby LED then goes to green when powered then, when failure occurs and 3 blinks code appears. I monitored pin 5 STBY+3.3V (CN6200) when on standby, green light and when 3 blink error is repeating, still nothing. DMM set too Auto range on VDC = 0.00v "
So the question is, is the 3.3VSTBY always stay at 3.3V or it drops to 0V with or without having main board connected?
So keep meter probes on chassis and 3.3V STBY pin and tell us if it is going up and down or not.