Re: Faulty 42LG3000 Help!
I tired it on 2k and 20k. I have tried taking a reading from an inverter that i know works from another tv and i am getting a reading from that. Just not from either of the two inverter boards for this tv. Dan
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Re: Faulty 42LG3000 Help!
Okay so as far as I can see they are wired as I would expect. What range were you using your meter on?Leave a comment:
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Re: Faulty 42LG3000 Help!
Yes, will do it tomorrow as the tv is at my parents home. Thanks DanLeave a comment:
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Re: Faulty 42LG3000 Help!
Can you post a side-on picture of the transformers?Leave a comment:
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Re: Faulty 42LG3000 Help!
Yeah that is what I tried. Not getting any readings.
Also tried on both inverters.
DanLeave a comment:
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Re: Faulty 42LG3000 Help!
I have set the multi meter to 20k ohm and unless i am doing something wrong i am not getting any readings from any of them?Leave a comment:
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Re: Faulty 42LG3000 Help!
Yes fuses are fine on both. What setting do I need the meter on to check the reistance? Also do i need to put one end on the first red marking and the other end on the other red marking?
Then the same for the green markings?
DanLeave a comment:
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Re: Faulty 42LG3000 Help!
On both? Okay, it looks as if all the controller stuff happens on the master. The slave is a "dumb" board.
There are some transformers on the boards; check the resistance between the markings (attached) on both boards.
If the transformers are good, the resistances will match within 3%.Attached FilesLeave a comment:
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Re: Faulty 42LG3000 Help!
Okay on these sets the two inverters work with each other.
If the master is dead you will usually get nothing at all on the screen.
If the slave is dead you will sometimes get a brief flash or 2 seconds to black.
Each of the boards has a fuse on it; the white chunky object next to the power connector. Check this fuse with your meter.Leave a comment:
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Re: Faulty 42LG3000 Help!
Master - VIT71053.54 LOGAH REV:0
Slave - VIT71053.55 LOGAH REV:0
Thanks DanLeave a comment:
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Re: Faulty 42LG3000 Help!
I have repaired tvs in the past and there is nothing obvious to the eye that i can see.
Also my fault sounds as if it may well be the two seconds to black that you mentioned. You can see the full screen image once first turned off then it goes black and only the sound can be heard.
DanLeave a comment:
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Re: Faulty 42LG3000 Help!
On each side of the screen there is an inverter.
Can you please take a closer picture of each inverter. Thanks.Leave a comment:
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Re: Faulty 42LG3000 Help!
Please find an attached image of my set minua psu
Leave a comment:
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Re: Faulty 42LG3000 Help!
Ok thanks Tom, I will dig out the camera and post some picturesLeave a comment:
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Re: Faulty 42LG3000 Help!
It sounds like 2 seconds to black; quite a common issue in fact. I just fixed a TV with this fault. A good start would be to post pictures of the insides of your TV.Leave a comment:
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Faulty 42LG3000 Help!
Hi all,
I have a faulty 42LG3000 TV.
The fault is that when the set is powered on it comes on and the image flashes on the screen for a second if that, then the display goes black although the sound can still be heard.
Has anyone ever encounted this fault?
Any advice would be greatly appreciated.
Dan
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Hello everyone. 😀
As per thread title, this unit has a serious SMPSU fault. It blows F1001, which is a 10A M205 in the phase from the mains input.
Very first thing I tried, was simply replacing the fuse, but the replacement ceramic fuse blew immediately.
Looking at the schematic for this PSU, I then removed what I thought was the next likely candidate: D1001 - the HV main bridge rectifier.
This isolated the fault(no longer blows the main fuse), but does not point me to the actual fault.
There are no devices that have exploded or otherwise show signs... -
I have this LG 42LG3000 Tv which operates on all inputs without any issues whatsoever. However when you try to turn the Tv off the screen goes blank as it would normally however it then turns itself back on again!
So far I have replaced the main board without any resolution to the problem.
When the inverters master and slave VIT71053.54 VIT71053.55 are disconnected from the power supply then the TV will turn off as it should (obviously without any ccfl output).
I have read through a few posts for this model without anyone having this issue as far as I can tell.
I... -
- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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I am a hobbyist (not a professional) so please be gentle...
I recently received an XR-77A80J that wouldn't turn on. (Repeating 5 flashes when plugged in.)
I did a hard reset by holding the power button for about 30 seconds until the set powered down. I then tried to turn it on and it powered up, bringing me to the setup screen. There's not a lot of detail on the setup screen but the picture didn't have any distortions, so at least a cursory examination suggests no physical damage to the screen. The set appeared to be working normally, but it shut down after about 15 seconds,... -
I have been having a fun time at work with two pieces of equipment that had shorted components or shorted component cables to machine frame
I would check what my multi meter was telling me about how many ohms I getting with the multi meter was telling versus the ESR was telling me about weather or not it really was a short to machine ground or not
One note at first we thought that it might be a bad I/O card or a malfunction PLC including me as well but I thought I would try and see if removing the I/O cables would make a difference or not and this time it did make a difference...
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