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
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Sony KLV32U300A power on/off with 2 times blinking led
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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.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Sony KLV32U300A power on/off with 2 times blinking led
Originally posted by Admirality View PostHi 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
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"Last edited by budm; 06-24-2020, 12:21 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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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.Last edited by budm; 06-24-2020, 02:43 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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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
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Re: Sony KLV32U300A power on/off with 2 times blinking led
Originally posted by Admirality View PostOn 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
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.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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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
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