My LG42LV4400 TV will not come on? The red light on the front is on when plugged in but do not change when the power on button is pressed or the power-on on the remote is pressed. Yesterday was fine turned it off with the remote last night and it hasn't come on since. I did pull the back off it to check for swollen caps but none seen. I did check a couple of voltages on the power supply board @ CN201 and found that I have 5v standby but no 12v. Should 12V be present there before being turned on.
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Re: LG 42LV 4400 Will not come on
Please report the Voltage for all those pins except GND pin as request in post #2
You MUST put down the pin name and follow by the Voltage reading for eack pin when TV is off and when the power switch is activated so we can easily see what it has and does not have in two states.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: LG 42LV 4400 Will not come on
Pins 1,2,3 from the bottom is Remote on\off and I am reading 5.2v Pins 4,5,6,7 is SGND Pins 8 &9 is 12.6v and I am reading 0 voltage. Pins 10,11,12 are labeled PWM 1 PWM 2 & PWM 3 BL on\off and I am reading 0 voltage. The unit do not power on.Last edited by davg; 06-03-2018, 01:51 PM.
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Re: LG 42LV 4400 Will not come on
Originally posted by davg View PostPins 1,2,3 from the bottom is Remote on\off and I am reading 5.2v Pins 4,5,6,7 is SGND Pins 8 &9 is 12.6v and I am reading 0 voltage. Pins 10,11,12 are labeled PWM 1 PWM 2 & PWM 3 BL on\off and I am reading 0 voltage. The unit do not power on.
Please check the DC Voltage right between the two legs of the main filter cap in the HOT side of the circuit, it should be around 380 ~ 400VDC range.
Power supply: Delta DPS-131BP ALast edited by budm; 06-03-2018, 04:25 PM.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: LG 42LV 4400 Will not come on
Well, that means the PFC Voltage booster circuit is not working, that 12V and the LED power supply section needs that Booted Voltage to run.
There are 3 barrel body type Diodes D800A, 800B, 801 close by the main filter cap, check the RESISTANCE in both directions on all 3 of them and report the readings.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: LG 42LV 4400 Will not come on
Tks again budm D801 is showing 0 ohms in one direction and 0L in other direction D800A D800B is showing 0L in both directions without any power supplied. With unit plugged in D800A & B is showing 10.9 m oms in one direction and 0 Ohms in the other direction where as 801 is showing 0L one direction and 0 ohms in the otherLast edited by davg; 06-03-2018, 05:23 PM.
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Re: LG 42LV 4400 Will not come on
What Ohm scale are you using?
Remove D801 and test it off the board.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: LG 42LV 4400 Will not come on
Use 200 Ohms scale on that D801, but at this point I doubt that 801 is bad otherwise it would have shown <1000 Ohms in BOTH directions.
What we to do next is to check VCC pin of the PFC Controller IC to see if it has switched DCV on the VCC pin to run.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: LG 42LV 4400 Will not come on
https://www.badcaps.net/forum/attach...7&d=1528048318
Looking at your pictures which are not very clear, it looks like 8-PIN SMD IC801 to the left of D801.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: LG 42LV 4400 Will not come on
NCP1608 PFC Controller by ON Semi.
Check and see if you do have Voltage between VCC and GND PIN or not when TV is turned on. Be real careful since you are working in the deadly side of the circuit.Attached FilesNever 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: LG 42LV 4400 Will not come on
It does not matter if the TV comes on or not, we are looking to know if the Voltage changes or not when power switch power switch is activated.
"Remote on\off and I am reading 5.2v" right now the power supply is getting the control Voltage to turn on the rest pf the power supply but it is NOt happening right now so you need to fix the power supply problem first before anything else.
You should read the basic troubleshooting first so you will understand how the TV works.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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