Author Topic: EEVblog #411 - MiniPro TL866 Universal Programmer Review  (Read 1029779 times)

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Offline ebastler

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Re: EEVblog #411 - MiniPro TL866 Universal Programmer Review
« Reply #1950 on: January 21, 2021, 10:24:21 am »
I would start with trying another computer, and another USB cable.
 
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Online Shock

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« Last Edit: January 21, 2021, 11:51:43 am by Shock »
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 87V, 117, 27/FM       >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 
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Offline frischky

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Re: EEVblog #411 - MiniPro TL866 Universal Programmer Review
« Reply #1952 on: January 21, 2021, 08:31:36 pm »
Thanks for the suggestions.

No dice on the different USB cable or computer, same Pin 4 GND error.

I'll wait until the seller replies and see what they want to do.  Sending it back to China would probably be half the value of it.  It is probably a simple repair, but I get antsy when desoldering gets involved, especially on boards with lots of SMD. 
 

Offline galaxy76

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Re: EEVblog #411 - MiniPro TL866 Universal Programmer Review
« Reply #1953 on: January 23, 2021, 09:27:02 am »
hi, how long does it usually take to erase an eprom (m27C4001)?  I bought a gray Chinese eraser like this one in the picture.  I have some m27512 eproms original that clear in 6 minutes.  instead the m27C4001 original are canceled in 40 minutes.  it's normal?  thanks
 

Offline ebastler

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Re: EEVblog #411 - MiniPro TL866 Universal Programmer Review
« Reply #1954 on: January 23, 2021, 12:38:42 pm »
@galaxy76 --
What is wrong with the answer below, which you received earlier in resonse to pretty much the same question?
Also, could you please delete two of the three redundant posts you just made? [Done, thanks!]

i bought a chinese eprom erase 4w 254nm (grey) .  I have to delete some Chinese eprom m27C4001.  how many minutes does it take?  thanks
For a good eprom, 10 to 15 minutes should about do it. I've used several thousand M27C801 Chinese eproms and on the rare occasion I've had to erase one they take 1-2 hours. They are branded ST but scrape off the black paint and they have some Chinese writing underneath.
« Last Edit: January 23, 2021, 12:50:16 pm by ebastler »
 

Offline galaxy76

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Re: EEVblog #411 - MiniPro TL866 Universal Programmer Review
« Reply #1955 on: January 23, 2021, 12:45:28 pm »
this time they are new and original m27C4001.
« Last Edit: January 23, 2021, 12:52:22 pm by galaxy76 »
 

Offline Bud

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Re: EEVblog #411 - MiniPro TL866 Universal Programmer Review
« Reply #1956 on: January 25, 2021, 08:55:21 pm »
From ST datasheet:

Quote
The recommended erasure procedure for the M27C4001 is exposure to short wave ultraviolet light which has wavelength of 2537 Å. The integrated dose (i.e. UV intensity x exposure time) for erasure should be a minimum of 15 W-sec/cm2. The erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet lamp with 12000 µW/cm2 power rating. The M27C4001 should be placed within 2.5 cm (1 inch) of the lamp tubes during the erasure

You can compare the requirements such as the wavelength and dosage against the ones for other UV Eproms.
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