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Repaired: LG50PQ6000 -
Re: LG 50PQ6000 unstable 5v standby
For the majority of cases an ESR meter is useful but not on small startup caps.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
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Re: LG 50PQ6000 unstable 5v standby
Please could some one tell me what value this resistor is please im going mad!
and...
what the heck are these bananas up too????
Attached FilesRepaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
I'm not sure, but I think it will be less than 10 ohms. Is it failed?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
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Re: LG 50PQ6000 unstable 5v standby
Well it measured 0.6 ohms so im not fully sure at the moment.Repaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
If it goes from one pic of that IC or from the transformer to ground it is the source current resistor and that is normal.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
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Re: LG 50PQ6000 unstable 5v standby
So if I was to de-soldier the output of the step-down transformer on the output of the W6252 would stuff blow up?
I'm wondering if this would help me isolate the fault.
Ie. if my voltage into the W6252 was still low it would confirm there were no components casing a short the other side of the transformer.Repaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
I don't know why you haven't replaced that startup cap yet, just to eliminate it.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
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Re: LG 50PQ6000 unstable 5v standby
All the electrolytic capacitors that are directly attached to the legs of the W6252 have been previously replaced and are new.
All the components I have circled in red have been replaced.
The ceramic capacitor circled in grey has not yet been replaced. MAybe I should look into this?
I wonder if the diode that burnt out and was replaced wasn't an exact match? Something caused this diode to heat up and burn. Maybe it just failed and took some thing else with it.Attached FilesRepaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
Hmm, did not realise that. Got a picture of the under-side of that area?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
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Re: LG 50PQ6000 unstable 5v standby
Yeah give me a moment only if you excuse some of the soldiering some of the components have been in and out a number of times now.Repaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
Ok the rear of the circuit. I have circled in grey to give you an idea as to the location of the W6252 and the blown diode.
PIN one is the top of the IC PIN 2 n/c ect ectAttached FilesRepaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
Right, and is that new diode OK?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
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Re: LG 50PQ6000 unstable 5v standby
Well the original diode was: IN4007S 943 and is faulty 0.03v both ways on diode test.
And the current replacement: IN4007
Diode tests ok 0.549v one way and .0L the other.
I wounder if the IN4007S 943 is different to the IN4007Repaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
Probably OK but if that failed it could have damaged the switcher IC.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
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Re: LG 50PQ6000 unstable 5v standby
By switcher IC do you mean the W6252?
I ordered one yesterday as a bit of a punt.Last edited by Baileybum1234; 04-01-2013, 07:54 AM.Repaired: LG50PQ6000Comment
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Re: LG 50PQ6000 unstable 5v standby
Yeah that IC.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
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Re: LG 50PQ6000 unstable 5v standby
Well have I given in? I dont know but what I do know is that I picke up a PSU and control board for £19.50 delivered from a well known auction site not far from here.
Im still going to try and fix the old one when I get the IC.Repaired: LG50PQ6000Comment
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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.
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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,
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 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...
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