i got this set today and it keep power on and off every 2 sec. i notive no vs or va voltage when i unplug all cable on the power supply .the ac detect pin got 5v and drop to 0 when clicking also the main board ave 3-4 green diode and 1 red diode that glow when clicking on the imediately shut off after 2 sec like a infinite cycle.i think the power supply maybe dead or the main board..need advise if you know .
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Re: lg 42pc1da on and off power supply problem or ??
There are many 3300uF 10V caps on that PSU.....
These go bad and can cause exactly that symptom. As I remember--There's 9 of 'em Change the lot! That should helpTELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM! -
Re: lg 42pc1da on and off power supply problem or ??
i ave test all one by one out of circuit,all read good .i test the fet and ifound 1 short, replace it ,still no go ...my ac detect pin fluctuate 0v to 5 volt when clicking cycle.. 3.4v ok the rest got nothing ...Comment
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Re: lg 42pc1da on and off power supply problem or ??
it the us model 42pc1da-ubComment
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Re: lg 42pc1da on and off power supply problem or ??
'Ah--Ive been having 'fun' with that same set--and its IPM's...
The PSU can be removed from the set, and run on the bench.--Makes life easier to work on.
As I recall, there's a PSU-On pin that needs to be tied to the STBY-5V pin by a 1K resistor, also need to supply the Vs-On pin the same way and the 3.3V-On pin too, so that those supplies become active.
A 100W 240V bulb can be connected to the Vs and Gnd pins--and should light. Voltages can be checked and set.
--This is the way I work on the PSU's of sets,--MUCH easier than messing round with it in the set....
What part of circuit was the dead-mosfet in? Maybe you have other dead devices in the drive circuit to that part....TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!Comment
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Re: lg 42pc1da on and off power supply problem or ??
the part is a rectifier diode b2306 . i buy a board for 60$ on eBay so i will see if the psu is the problemComment
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Re: lg 42pc1da on and off power supply problem or ??
after replacing the power supply tv turn on but i see red pixelisation on dark area anybody know what board can cause this ..i check the voltage and it all goodComment
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Re: lg 42pc1da on and off power supply problem or ??
The red spots called, 'Mal-Discharge' are a known issue.
The Control-Board Firmware needs updating using a LG jig and computer with the special software to re-new the firmware with a later version to fix this problem.
'Capkid' in the USA can do this for you as well as myself as we have the jig and firmware-files etc, but I'm based in UK.TELEFIX
How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
http://www.irf.com/technical-info/appnotes/an-1088.pdf
PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!Comment
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Re: lg 42pc1da on and off power supply problem or ??
if i put a new(use) board .how many chance this can work??Comment
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
hello.
I have Sega Saturn and 5 years ago, I recapped all of capacitor in the Power supply, Because At that time, It frequently freezed black screen after SEGA logo displayed.
It hardly ever freezed after I finished to recap all of caps in the power supply.
But Yesterday, It did not show any screen at all and its green power LED constantly blinked.
To my surprise I found that all of two NXH 10v 2200uf capacitors in the secondary area of Power supply have been bulged and It measured 57 mF and 75 mF capacitance.
It seems that quality...
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