Re: LG 50PQ6000 unstable 5v standby
Both are incorrect... It should be 5V by any means...
Both are incorrect... It should be 5V by any means...
-
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: LG 50PQ6000 unstable 5v standby
Agreed! Guess its a good start.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Im gonne jump back to page 4 later today and do a couple of the tests I went through before.
Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Ok had a little time to have a play with this again today:
Stand by 5v board unplugged 4.43VDC
Voltage on J22-GND = 12.8v DC
Voltage across the 2 BIG cappasitors 400v then drops until the relays click again.
The relays click every 10 seconds on/off.
Looks like something is been sensed not right and not letting it power up. I think its a different problem to before.
Standby voltage definately looks low.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Does look odd, any adjustment for it? Also, how is it with main board connected? Is there an AC-DET pin, if so, what does it measure?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
ok cant see if there is a 5v adjustment anywhere just a VA and VS adjustment.
AC detect is only a few mV with the board dissconnected but spikes as the relays click. The spike is a bit hard to measure on a DVM its so quick.
With the board back in the TV there is no AC DET until you hit the power button the red stand by light comes on relays click and the red standby light goes off and stays off. With the TV power button pressed in the AC DET pin is 4.42VDC
After one attempt to start the TV shuts down with no red stand by LED on at all.
No components are getting hot that I can feel.
Standby voltage stays at 4.31.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Do you see a KA431 or KIA431 or TL431 on the board anywhere.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
KIA 431A 941? I have found 4 on the power board.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Yes, the nearest one to the standby section, the voltage between pin 2 and 3, it should be about 2.5V.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
In the moment the relay clicks IC102 a KIA 413A jumps upto 9v then drifts down to 0.4v.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
I made an error it should be between 1 and 3 I think.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
ok will try again. :0)Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
In the moment the relay clicks PINS 1&3 IC102 a KIA 413A jumps upto 6v then drifts down to 0.6v.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Final try, what does pin 1-2 measure?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
IC102 pins 1 and 2 = 1v then jumps to 2.28v momanterily on relays click.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
There is an inductor thats making a noise L102 and when you hear the 2 relays click you can hear other parts of the TV start to fire momanterily.Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
2.28V should be 2.495V, error is = 8.61%.
4.43V should be 5V, error is = 11.4%
It's close enough to call that it could be the issue. But I'm not sure how to rule it in or out. You'd have to test it out of circuit to be certain.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
ok cool I can get it out of circuit. Just how do I test it?Repaired: LG50PQ6000Comment
-
Re: LG 50PQ6000 unstable 5v standby
Datasheet has diagram
page 20, first schematic.
https://cdn.badcaps-static.com/pdfs/...8a1d8057ef.pdf
Or just replace it, if you have an old computer psu it's bound to have one of these.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
-
Re: LG 50PQ6000 unstable 5v standby
Just looking at some utube vids. like a diode test?Repaired: LG50PQ6000Comment
-
Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated. -
Hi all.
I started a thread while back regarding TV power supply standby circuitry as it is something I am not quite on top of.
SMPS theory and function is becoming more familiar, however the standby part is still a bit of a mystery.
Anyway, a friend has this TV with the above mentioned power supply board which has no standby voltage, nor any other voltages leaving the board.
The mains AC comes in fine, gets filtered and rectified with power is on the main filter cap as well as the transformer and drain pins of the ICE3B0665J, but that's it.
... -
Hello,
I am trying to re-purpose this power supply that I saved years ago from a tv with a cracked screen for a monitor but that is not really that relevent at the moment. I do not recall which tv but a google search looks like it is from Wharfedale LTF37K1.
You may notice I made some alterations moving some components to the top and some wires which are from a 5v regulator I fitted to the 12v output as the monitor requires 5v. The standby was already at fault from the beginning, it has nothing to do with the alterations...
Years ago it had some bulging caps... -
Hello forum. I've recently been given a Yamaha TSX 120 DAB radio and ipod dock. Its working well however when put on standby its using 6.3 watts. The manual states less than 1 watt on standby. I measured this with a plug in monitor which seems accurate with other items. In use it uses around 7.5 watts. Firstly has anyone who owns a similar radio also got a plug in monitor to check if this is normal with this unit? In the first half a second the monitor shows 0.3 watts which I suspect is what it should use but something is switching it to be almost fully powered. I've searched the manual for eco...03-01-2024, 07:25 AM -
Hello everyone,
I got a Samsung The Frame 55 inch TV for free from uncle cause it is not turning on anymore. I am in the second year of training as an electrician so I have knowledge already but I am far away from to be a pro.
The TV has Standby but ist not turning on. A Friend of mine owns a 50 inch Frame TV so I checked the One Connect Box and the One Connect Cable there. Both are good and working normally. I have opened the TV case and measured some voltages on the Board.
What I already found is that the 12.8V are not an the connector to the main board connector to the power...
Comment