Electronics > Repair

Hioki 3532-50 LCR Repair (One major problem solved, SM still wanted)

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Martin72:
A circuit diagram would be helpful, try your luck with the supplier...
I'm a bit surprised at the moment that it's such a “problem” to display the characters properly.

KungFuJosh:
I was surprised at first as well, but I'm not anymore. Hioki clearly designed it a specific way with a specific LCD panel, and getting a modern LCD to match that isn't as straight forward as I thought. At least not for whatever this LCD was designed for.

I already asked for a schematic and they said they didn't have one. Which might might mean "they don't have one they'll share." 🤷

coromonadalix:
all theses resistors things must play with duty cycle, timings  etc ...   it's a matter of finding the row and column drivers data sheet if they exists and try to figure out   ...

KungFuJosh:

--- Quote from: coromonadalix on August 26, 2024, 10:48:34 pm ---all theses resistors things must play with duty cycle, timings  etc ...   it's a matter of finding the row and column drivers data sheet if they exists and try to figure out   ...

--- End quote ---

Exactly. Here's my notes so far:

R1 392 -> 4.7k -> 5.6k (increase shifted contrast center further after adjusting R2)
R2 472 -> 7.5k (better contrast center / more range with trim pot)
R3 823 -> 100k
R4 622 -> 7.5k -> 10k (bad - more flicker) -> 5.6k (less flicker)
R5 392 -> 4.7k -> 5.6k (vertical lines partially returned) -> 7.5k better!
R6 822 -> 10k

KungFuJosh:
I just ordered another touch panel from eBay (already got a refund from the junk one). This one is supposedly new, and the trace pattern looks more like the original.

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