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Good morning, Here we go, the last nit of testing from cold..... With no heat applied and the ambient temperature at 18 and the hybrid pcb off and on its own test bench now. 4.00v going in 3.90v coming out I work that out at a 2.5% drop without even any heat If i very slowly warm the...

The reply I got from the supplier of the hybrid board ISA215-HYB is already discontinued and don't have any substitutes. Sorry for your inconvenience. Best Regards, Norie Nemoto

https://www.ebay.co.uk/itm/LED-BDM-FRAME-PROGRAMMER-FOR-KESS-KTAG-FGTECH-KESS-KTAG-ECU-4-PROBE-PENS-UK-k-/174501333559?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=710-127635-2958-0

one last question I looked at the spec sheet and it looks like TC4066BFT? Is that the right package? And is a hc4066 compatible in the same package?

I dont know who made it, im sure it was from ebay, ill try and find it for you Its superb for ecus and saves soldering, the probes are very heavy and the contact pins at the bottom are spring loaded so you get a positive firm contact. I dont like to disturb anything if I dont have to. As with...

Is it HC4066?

Well enough for one night Kenny, but Its the one which makes the most difference with temperature change When I put that number into google it looks nothing like the one I circled, the one I circled has 14 pins? I want to get as many components as possible and replace one by one The only...

I’m 99% sure it’s this chip on the lower of the board, do you know it’s specification please The more heat the less output on pin 3 and the more cooling it rapidly brings the voltage back up but not to input voltage I have only seen input voltage once https://imgur.com/gallery/bfZgZ9x

I have replaced the two capacitors now on the top of the board, still the same do we know exactly what chips they are on the top and bottom of the 12v end? the 12v supply is stable and on the other side of the resistor is stable @ 10.75

The lower one has measured 109.2 nf

The board is now off and wired up the voltage is about 3.8 on the output and doesent drop off unless heated, I have removed the lower capacitor and now have 3.54v what are they meant to be and maybe I can replace them if I have the right ones?

Heating that corner of the board has caused the output to drop off to 3.83 volts again The input 12v after the resistor has stayed constant to that part of the circuit is probably ok. It must be time to take the hybrid board off and test so I can see the bottom of it, at least this is where...

OH NO. The problem is now that without doing anything more, the output voltage is bang on 4.01 WTF can I do now!!!!!!!!!!!!!!! I really appreciate your help KIEV because we are pinpointing at least my problem!

The resistor and capacitor are in parallel across that part of the circuit so maybe. But realistically should I be having nearly 1.5v drop? Is it time to start removing components! I have 0603 package resistors but not sure if they are 1%

https://imgur.com/gallery/p0pPSUl

is that resistor an 0603 package?

sorry and 13.33 mega ohms

Since the test heating it, I sprayed some pcb cleaner to cool it, the 12v input voltage has only recovered to 10.6v, before I heated the board it was 10.75 Another test now, the output voltage on pin 3 when 20 degrees started off at 3.804 and after heating the same corner rapidly dropped off to...

The resistance across that one that you say is 100ohm is 13.23 mohm? Is that because of the fault or something else on the circuit?

Heating the corner of the board with 500 degree hot air blower where the 12v input is causes the voltage after the resistor and capacitor to drop from 10.75v to 10.51.......... So shall I take the board off or do I need to remove the capacitor and check first, then perhaps replace the resistor...