Author Topic: TC1 lcr-meter transistor-tester fix (Read 183305 times)

iv3wjr · « **Reply #300 on:** December 29, 2023, 03:04:02 pm »

Sorry, forgot to add the battery voltage: 4.16V at the battery pins, after full charge (green led) and charger disconnected. Charging or not makes no difference, cannot get rid of the message after power on/off several times.

njsw88 · « **Reply #301 on:** February 02, 2024, 02:41:23 pm »

i know this is an old post but i have the same issue with my TC-1 multi-function tester, but my pcb board, is very different than the one in the post, i have attached the pic but i found that C11 and C12 seam to be ok, but i found that there is a short on C2 , is this a new fault or should i still replace the C11 , C12 and the C2, and what should i replace them with as i do not know what they are ? please help as im new to electronic any help at all will be appreciated, thankyou shane from Brisbane Queensland Australia

madires · « **Reply #302 on:** February 02, 2024, 05:19:33 pm »

Remove C2 and check if it's really shorted or if the short is somewhere else. BTW, your tester has a fake ATmega (looks like an APT32F172K8T6).

njsw88 · « **Reply #303 on:** February 04, 2024, 06:41:41 am »

tock out the C2 and no difference still short some where

njsw88 · « **Reply #304 on:** February 04, 2024, 07:17:05 am »

hi again , what is a good multi-function tester to buy i was looking at the " MESR-100 ESR Capacitance Ohm Meter Capacitance Resistance Tester" or is there a better on with the same sort of display as the TC1
thankyou in advance for your replies shane

MarkMLl · « **Reply #305 on:** February 04, 2024, 09:05:41 am »

EEVBlog still advertises budget multimeters: perhaps we also need a definitive recommendation for a budget component tester with a stable design that the community can support happily.

MarkMLl

madires · « **Reply #306 on:** February 04, 2024, 09:28:03 am »

AY-AT (aka GM328A) with a DIP ATmega (best bet at the moment to avoid alternative MCUs).

njsw88 · « **Reply #307 on:** February 04, 2024, 10:48:29 am »

yes that would be awesome

njsw88 · « **Reply #308 on:** February 04, 2024, 10:49:55 am »

yes i will thanks

MarkMLl · « **Reply #309 on:** February 06, 2024, 10:07:18 am »

Quote from: madires on February 04, 2024, 09:28:03 am

AY-AT (aka GM328A) with a DIP ATmega (best bet at the moment to avoid alternative MCUs).

But from where? Is there somebody reputable like Farnell ** who will commit to supplying a stable design?

** Noting of course their extortionate small-order handling charge

MarkMLl

njsw88 · « **Reply #310 on:** February 07, 2024, 03:12:28 am »

what about RS Components

njsw88 · « **Reply #311 on:** February 07, 2024, 10:06:14 am »

what i have found now , that if i put 3v on the VCC of the CH340N chip which is located at U3 on my PCB board which i show on my other post it starts up and i have no more shorts on C2, do you think that this is the problem ?

madires · « **Reply #312 on:** February 07, 2024, 11:08:09 am »

How much current is drawn on that external 3V? Are CH340N and C2 connected via some trace?

njsw88 · « **Reply #313 on:** February 08, 2024, 09:17:17 am »

3v 1amp

madires · « **Reply #314 on:** February 08, 2024, 09:39:41 am »

Such a high current is an indication of a shorted component. You could use that and look for a hot component (most likely an MLCC).

njsw88 · « **Reply #315 on:** February 08, 2024, 02:12:45 pm »

ok thankyou i will check

MarkMLl · « **Reply #316 on:** February 09, 2024, 09:53:49 am »

Quote from: njsw88 on February 07, 2024, 03:12:28 am

what about RS Components

They unilaterally cancelled half of one of my orders after assuring me on the 'phone that they were able to fill it. 'Nuff said? :-/

MarkMLl

njsw88 · « **Reply #317 on:** February 09, 2024, 01:11:45 pm »

hi again guys ok the Volts are 3.2v and the amps are 0.3 on the U3 CH340N chip it cam on and stayed on, but i notice that the MEGA928P got hot but could not feel any other chips getting hot, any ideas ? or is it the MEGA928P chip that needs replacing, thanks Shane

madires · « **Reply #318 on:** February 09, 2024, 03:03:29 pm »

Another common problem is a bad SRV05-4 (U6 in your case, near the ZIF). If it's shorted it would also impact the MCU. Remove U6 and see if it helps.

njsw88 · « **Reply #319 on:** February 10, 2024, 04:42:55 am »

ok thankyou i will give it a go thanks again

spacebiscuit · « **Reply #320 on:** February 21, 2024, 06:29:20 pm »

Can I jump in - I have the T7 - was working fine but I think I forgot to discharge a capacitor. Tried to turn on the tester today and it is dead - led comes on if I plugin the usb.

I've open it up and I get open circuit on c3, c25, c9 and r15 - is that my issue?

I have this model (taken from page 11)

Thanks in advance.

carl1961 · « **Reply #321 on:** February 22, 2024, 03:21:08 am »

Quote from: spacebiscuit on February 21, 2024, 06:29:20 pm

Can I jump in - I have the T7 - was working fine but I think I forgot to discharge a capacitor. Tried to turn on the tester today and it is dead - led comes on if I plugin the usb.

I've open it up and I get open circuit on c3, c25, c9 and r15 - is that my issue?

I have this model (taken from page 11)

Thanks in advance.

as on page 11 looks like same as one @madires said has a LGT8F328 MCU I have the same board, but still working, I never tried dumping the firmware, most likely useless to try as they seem to lock them from dumping.

spacebiscuit · « **Reply #322 on:** February 26, 2024, 08:43:36 pm »

So is this only good for the recycling/trash now?

njsw88 · « **Reply #323 on:** March 02, 2024, 02:41:08 pm »

Can any one tell me what this chip is or what is its equivariant, as i cant find anything on the net about this chip.

any help thankyou

indman · « **Reply #324 on:** March 02, 2024, 04:45:22 pm »

njsw88, this is a microcircuit SD6210A


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Author Topic: TC1 lcr-meter transistor-tester fix (Read 183305 times)

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