Electronics > Repair
Fluke 199C scopemeter repair
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Rollin Hand:
The BMS is 2S 7.4V 7.2V Li-ion Li-Po Battery Protection BMS PCM Ch/Dis. Current 4A 2S4AW004.

eBay item number:321761796022
 I think this is the correct one?
You think is necessary to install the 130k resistor ? it will damage the pack by overvoltage? because my screen is fragile ,for me is to much risk to take it  a part.
Thank you.
Rollin
feedback.loop:

--- Quote from: Rollin Hand on August 06, 2020, 12:16:01 pm ---The BMS is 2S 7.4V 7.2V Li-ion Li-Po Battery Protection BMS PCM Ch/Dis. Current 4A 2S4AW004.

eBay item number:321761796022
 I think this is the correct one?
You think is necessary to install the 130k resistor ? it will damage the pack by overvoltage? because my screen is fragile ,for me is to much risk to take it  a part.
Thank you.
Rollin

--- End quote ---

Looks right. Not the cheapest one though. I believe I have seen under $3 delivered.
I used a 120K resistor. 130K will probably set the voltage too high. I believe it is necessary. As I mentioned in the video, BMS will prevent catastrophic overvoltage, but we should not rely on it for normal charging. It is set to about 8.6V.
On the other hand, removing the main board does not involve removing the LCD. So I don't see a problem.
aqibi2000:
Feedback loop can you share the gerber file so he can fix his 199C?
feedback.loop:
I don't mind sharing the gerbers. I am a bit reluctant because I am not proud of the connector placement. I would like to move it a bit down, so that it wouldn't need to be soldered a bit above the board, and it would be a bit easier to install the board. Perhaps I should make the change and run another batch, but I don't need them myself. Is there enough demand, say for 10 boards? Say, we call it $20 plus postage for one kit: board + connector + falt flex (with opposite-side contacts) for the new batch. I still have a couple from the first batch ($30 + postage).
cheeseit:
I always thoroughly enjoy your videos! :-+
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