Sony KLV32U300A power on/off with 2 times blinking led

[Admirality]

Hi all i am battling with this issue and was doing voltage tests and came across a zener diode which has no voltage across it,it is 5v6B on the power supply,am wondering is somebody could help me in the right direction,i am still new at lcd tv repairs,i used to repair crt tv's,i will greatly appreciate any advice given

[nomoresonys]

Re: Sony KLV32U300A power on/off with 2 times blinking led

I just lift a leg and check out of circuit, you can just clip a leg if accessible and if it's ok just solder the leg back together.

[budm]

Re: Sony KLV32U300A power on/off with 2 times blinking led

We need good clear pictures of the backside of the TV showing all the boards, and pictures of each board so we can see what we are dealing with.

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

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[jetadm123]

Re: Sony KLV32U300A power on/off with 2 times blinking led

What are the voltages you're seeing at the power supply connectors? List each pin description with the power on and off voltages.

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Ok will place them when i get home,and thanks guys for your input so far.

[jostewcrew]

Re: Sony KLV32U300A power on/off with 2 times blinking led

hey op, is it just a at the end of the model number or ac or act? three different models and trying to get the right info for you.

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Just an A it is KLV32U300A

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Hi jostewcrew the service manual is posted above,3 different models

[budm]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Hi all i am battling with this issue and was doing voltage tests and came across a zener diode which has no voltage across it,it is 5v6B on the power supply,am wondering is somebody could help me in the right direction,i am still new at lcd tv repairs,i used to repair crt tv's,i will greatly appreciate any advice given

So what Voltage are you getting at the three connectors on the cold side of the power supply when TV is plugged in but not turned on and when power switch is activated?
As you can see the pins are labeled with name for each pin so you must put down the connector pin name and follow by the Voltage reading for each pin so we can easily see whit it has and does not have.

What is the designator of the Zener diode in question?
I attached the schematic of ADP-154AF power supply for the 32"

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Sorry budm,i could not get round to testing when i was home but will definitely do it later when at home,and the zener is on the cold side

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Zener diode Zd 131 on schematic

[budm]

Re: Sony KLV32U300A power on/off with 2 times blinking led

That diode ZD131 is part of protection circuit that will shut down the power supply if it detects fault on +15, +24, and PWR_30 supply lines.
That Zener will not conduct until output of IC5 pin 7 goes high above 5.6V for the Zener to conduct which then will cause SCR151 to turn on and shutdown the power supply, you can look at the schematic to see how it works.
I did not error blinking codes in t he service manual.
Right now you need to make Voltage testing on the connectors I requested.

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Ok thanks budm i will do it when i get home later

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

On standby: C201 Pin 1+2=GND 3=0.12V 4=0.12V 5+6=GND 7+8=PWR PANEL 9+10=GND 11+12=0.8V 13=GND 14=0V
C202 Pin1=4.17V 2=0V 3=4,18V 4,5+6=GND 7+8=4.18V
C203=No Voltage
TV on: 201 Pin 1+2=GND 3=5.63 4=5.83 5+6=GND 7+8=5V 9+10=GND 11+12=14.60 13=GND 14=32V
CN202 Pin1=0.2V 2=0V 3=4.1V 4,5+6=GND 7+8=4.1V
CN203 Pin1to6=0V 7to10=24.4V

[budm]

Re: Sony KLV32U300A power on/off with 2 times blinking led

On standby: C201 Pin 1+2=GND 3=0.12V 4=0.12V 5+6=GND 7+8=PWR PANEL 9+10=GND 11+12=0.8V 13=GND 14=0V
C202 Pin1=4.17V 2=0V 3=4,18V 4,5+6=GND 7+8=4.18V
C203=No Voltage
TV on: 201 Pin 1+2=GND 3=5.63 4=5.83 5+6=GND 7+8=5V 9+10=GND 11+12=14.60 13=GND 14=32V
CN202 Pin1=0.2V 2=0V 3=4.1V 4,5+6=GND 7+8=4.1V
CN203 Pin1to6=0V 7to10=24.4V

So you are not providing all the pin names and Voltage readings to go with it. For example:
C201 @standby
Pin 1+2=GND
3=0.12V What is the pin name?
4=0.12V What is the pin name?
5+6=GND
7+8=PWR What is the Voltage reading?
9+10=GND
11+12=0.8V What are the pin names?
13=GND
14=0V What is the pin name?
So do it all over aging to show us what they all are.

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

C201@standby Pin 1+2=GND
3+4=pwr 6v=0.12v
5+6-GND
7+8-Pwr panel=0v
9+10-GND
11+12-Pwr 15v/1.6A=0.8v
13-GND
14-Pwr 30v/2mA=0v
C202@standby-Pin1-Ps on=4.17v
2-pwr err det=0v
3-4vsb/1.2A=4.18v
4,5+6-GND
7+8-4vsb/1.2A=4.18v
C203@standby Pin1to 6=0v rail-7to10=24v rail=0v
Then Tv on voltages according to previous post

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Sorry pin 1 to 5 is 0v rail and 6 to 10 is 24v rail on C203

[Admirality]

Re: Sony KLV32U300A power on/off with 2 times blinking led

Hi i just would like to find out if the regulator voltages are correct so if anybody could please give me info i will be grateful
INH=5.78v
I=5.78v
O=5.06v
A=1.22v