What is an EH14A 737J58?

[Dang]

Just been trying to fix an LG 37LC55 and found that this component is faulty, after about 10 minutes of being on an assortment of horizontal lines appear on the screen, this then leads to colour haloing, colours going weird, even the sound can cut out if a big bang happens(that would be GTA4). I found if using cold spray directly on the component that the lines would go, it will still leave the haloing, colour distortion etc but the lines do go only to return as the component heats up again, pressing the reset button on the main board will clear the haloing and colour distortion. I did try re-soldering it and this seemed to help extend it's usability but only by a few minutes, so it would need replacing, I just haven't a clue as to what it is so if you can help, that would be great, thanks, Andy.

[killian6pk]

Re: What is an EH14A 737J58?

Post a good clear picture of the component and mark it on the board. Also give us the Part Number of the board it is on and the Model Number and brand of the tv the part is out of.

I tried running different variations of the number you gave and none hit for a datasheet.

[Dang]

Re: What is an EH14A 737J58?

Post a good clear picture of the component and mark it on the board. Also give us the Part Number of the board it is on and the Model Number and brand of the tv the part is out of.

I tried running different variations of the number you gave and none hit for a datasheet.

Hi, sorry, it's from an LG 37LC55 main board. I've just had a good look around and found this, it seems it's a 1A low dropout linear voltage regulator AZ1117, SOT-223, 2.5v: .

[killian6pk]

Re: What is an EH14A 737J58?

Ok, do you have a DMM?
If so set it to DCV and place black lead on a ground screw and red on each of the legs in turn. Report readings back here. Number pins 123 left to right with large flat tab at top. You are reading voltages so boards need to be powered up. Be very carefull around the board where the power input is. Try not to touch anything on the power board.

Those regulators are frequently bad. They are pretty easy to replace. There is a thread that talks you through testing and what to expect. I will try and find it and get back to you with the address.

[killian6pk]

Re: What is an EH14A 737J58?

This is the location of the testing info for the LDO Regulators. Read it before doing anything. Also have you done a search of your model # in this section. You will get a lot of good information just by reading other peoples posts and the solutions they found.

https://www.badcaps.net/forum/showthr...999#post300999

Hope you get it repaired.

[budm]

Re: What is an EH14A 737J58?

So it is the 2.5V fixed regulator, looking at it with the big tab up (same as the pin 2 middle pin), meter's probes at the big tab and ground should show 2.5V, pin 3 (right) is the input pin. pin1 (left)

[Dang]

Re: What is an EH14A 737J58?

Been researching this one a little more and found that another Voltage regulator is acting the same, it's a FAN1587AD33X, a 3A low dropout voltage regulator, yet again if I spray cold spray over it the horizontal lines go temporarily only to appear again after a few seconds, I've also noticed that if I play a standard DVD signal through the phono connectors on the side the lines are very much subdued compared to an HDMI signal, indeed if the said DVD player is allowed to fall back to it's start up screen the lines are there in abundance??? I can only think it's an amperage issue as both regulators output the voltages at their stated values whether warm or cold, indeed it could be something else that I'm not aware of but I just don't know, I would have to suspect the voltage regulators otherwise why would they react as they do to the cold spray, if any one can help any further I'd be very grateful, thanks again, Andy.

Both Voltage Regulators are in very close proximity to each other, possibly on the same circuit.

[budm]

Re: What is an EH14A 737J58?

It can possibly be the filter caps at the input and the output of the regulator, the regulator may be oscillating due to bad caps.
This is one way to look for bad filter caps if you do no have scope, but have to have good meter.
https://www.badcaps.net/forum/showthread.php?t=31410

[Dang]

Re: What is an EH14A 737J58?

I had a suspicion about the caps but I'm no expert so thank you for the pointer, I shall probably just try and trace back to the voltage regulator's origin of power and just change them all out along that path as I have no setting to test them with, I can get a replacement board for £25 so for the purposes of experimentation I can go with that idea, thanks again, Andy.