EEVblog #411 - MiniPro TL866 Universal Programmer Review

[ebastler]

I would start with trying another computer, and another USB cable.

[Shock]

Similar problem reported here.
https://www.eevblog.com/forum/repair/tl866a-self-check-failed/

this one here
https://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/msg669260/#msg669260
was solved here
https://www.eevblog.com/forum/blog/eevblog-411-minipro-tl866-universal-programmer-review/msg669313/#msg669313

[frischky]

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. 

[galaxy76]

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

[ebastler]

@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.

[galaxy76]

this time they are new and original m27C4001.

[Bud]

From ST datasheet:

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.