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Test Equipment Anonymous (TEA) group therapy thread

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Robert763:

--- Quote from: mnementh on July 06, 2022, 07:22:41 pm ---
--- Quote from: Vince on July 06, 2022, 06:48:13 pm ---
--- Quote from: Specmaster on July 06, 2022, 04:24:34 pm ---
--- Quote from: Vince on July 06, 2022, 04:04:32 pm ---TV REPAIR


--- End quote ---
Make sure if you are able to resurrect the other strings, that your friend is well aware that he might actually spot areas of his screen that are dimmer than others, in the areas with the dead LEDs, otherwise he might not be happy with you. Short of replacing all the strings, I can see no way around that problem. Great work so far, keep it coming.

--- End quote ---


Well yes if I manage to fix the thing I will see if the lighting is even enough to be acceptable, i fnot will tell him what he wants to do.

Hopefully there WILL be dark spots and he will tell me OK fuck you can keep it... more spare boards/parts for Vince !  >:D

We shall see.

I don't know where to buy the strings nor how much that costs. If it's available for this particular TV, and is ridiculously cheap including shipping... like 20 Euros shipped, and given the TV is recent, maybe he will want to pay for that. We are not there yet....
--- End quote ---

Why the eff would you trash an obviously repairable TV like that? Just put it away and wait for a paycheck so you can buy some LEDs for Ifni's sake. You really should replace those LEDs anyways, even if you are sending it back to the owner. Just jumpering them out is begging for all the others in the string to fail prematurely.

Correct repair, short of replacing them all, would be to measure voltage drop across every LED with them lit up and replace any that read appreciably lower or higher than the average. That would be your best chance to avoid recidivism. You already have a cheap hot-air rework station, right?

mnem
 :-/O

--- End quote ---

These LEDs are driven by an active constant current source. Shorting out one or two does not stress the other LEDs in the string. It does affect the CC driver but probably not enough to reduce it's reliability.

Specmaster:

--- Quote from: Zoli on July 07, 2022, 06:06:33 am ---
--- Quote from: Vince on July 06, 2022, 05:58:52 pm ---...
As for DMM's, I don't have fancy modern ones that can test white LEDs.
...

--- End quote ---
You don't need a new and fancy DMM to test the LED's; as example, my DMM870(1998) gives 3.2v,  and the 8060A gives 8V in diode testing mode, both enough to light up any LED's.
That's why I've asked to check your multi-meters, so next time you will know which is suitable for LED testing(is part of "Know your tools" training)  >:D :-DD :-DD :-DD

--- End quote ---
I've just checked my bench meters and was pleasantly surprised to discover that my oldest meter, HP 3466A also gave me the highest voltage in diode mode of 4.6V and handhelds only giving me 3.2V, one more reason for keeping the HP then  :-DD

med6753:

--- Quote from: bd139 on July 07, 2022, 06:25:21 am ---
--- Quote from: med6753 on July 07, 2022, 12:21:38 am ---
--- Quote from: mnementh on July 06, 2022, 11:26:47 pm ---
--- Quote from: bd139 on July 06, 2022, 09:05:29 pm ---Find an image editing tool with white balance control on it. Click that then click the bit of the picture they’ll at is supposed to be white. Job done. 99% of the photo is the photographer not the camera
--- End quote ---

med uses Winbloze. Windoze Photos works very well for minor post-processing; that pic, I'd just turn the "WARMTH" and "CLARITY" sliders up a click or three; would make a world of difference. Vince complains about my grey printed knobs being purple too; personally, I suspect the monitor he's using injects a wee bit of bloo. ;)

mnem
 :blah:

 

--- End quote ---

No I don't. IrfanView64.

--- End quote ---

I am sorry for your loss  :-DD

--- End quote ---

Gee....seems to work OK for my needs.  :-// :-DD

Robert763:
On solder, I have a Really Useful Box full of reels. One of the shallow 4 or 5 litre boxes. So I think I'm got enough to see me out.  ;D

bd139:

--- Quote from: Specmaster on July 07, 2022, 07:13:09 am ---
--- Quote from: Zoli on July 07, 2022, 06:06:33 am ---
--- Quote from: Vince on July 06, 2022, 05:58:52 pm ---...
As for DMM's, I don't have fancy modern ones that can test white LEDs.
...

--- End quote ---
You don't need a new and fancy DMM to test the LED's; as example, my DMM870(1998) gives 3.2v,  and the 8060A gives 8V in diode testing mode, both enough to light up any LED's.
That's why I've asked to check your multi-meters, so next time you will know which is suitable for LED testing(is part of "Know your tools" training)  >:D :-DD :-DD :-DD

--- End quote ---
I've just checked my bench meters and was pleasantly surprised to discover that my oldest meter, HP 3466A also gave me the highest voltage in diode mode of 4.6V and handhelds only giving me 3.2V, one more reason for keeping the HP then  :-DD

--- End quote ---

Yeah I measured the 3465A. It doesn’t have a diode mode. You stick it in 1K ohms and it works. 4.6V too. Same circuit probably.

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