| Electronics > Repair |
| Hioki 3532-50 LCR Repair (One major problem solved, SM still wanted) |
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| KungFuJosh:
Here's a real photo with R5 increased to 5.6k. Contrast is at max but stuff still looks like crap, and now I would need to adjust R2 to shift things over and continue chasing the perfect balances. 🙄 |
| KungFuJosh:
On a side note, the resistor book I got is bullshit. Supposed to be 1%, but I don't have any 1k resistors because they're all 1.2k marked 1001. 🙄 |
| KungFuJosh:
After further experimenting, I went back to: R1 1.2k R2 7.5k R3 82k R4 4.7k R5 5.1k R6 8.2k There's some very minor ghosting, but overall I think it looks great. Here's the thing though. I originally was going to keep this, but now that I have an IM3570, I no longer need it, and I don't have the space for both anyway. I have another touch panel on the way, and if it works, I'm going to sell this. So the question is, hypothetically, would you buy this LCR with how the screen looks in this photo? Or should I scrap it and try and get an original replacement LCD instead? If the new touch panel doesn't work, I'll probably sell it for parts/repair, as I'm spending too much time on this, even if it was entertaining. Somebody with better skills & more ambition can try and improve it further if they want. 😉 Thanks, Josh |
| Martin72:
I would stop worrying about the little bit of ghosting and concentrate fully on the touch panel. As far as I can see, the ghosting is far removed from the 4 displayable parameters. I still find it fascinating that the display didn't work the way you'd want it to right away, especially since it's explicitly offered as a replacement. I also don't believe that the supplier doesn't have a circuit diagram for it, if he can give recommendations for resistor assemblies in the same breath. That's typically Chinese: they copy themselves like world champions, but don't give anything away in return. |
| KungFuJosh:
--- Quote from: Martin72 on August 28, 2024, 09:34:50 pm ---I would stop worrying about the little bit of ghosting and concentrate fully on the touch panel. As far as I can see, the ghosting is far removed from the 4 displayable parameters. --- End quote --- I agree, I think I'm over the minor ghosting. I looked at the stock panel again, and it has a giant rectangle behind the entire display, and the contrast only looks darker because it's not backlit. If you zoom in you can still see the pixelation, and some thin vertical line gaps. I think the illumination shining a light on that stuff made it stand out more. --- Quote from: Martin72 on August 28, 2024, 09:34:50 pm ---I still find it fascinating that the display didn't work the way you'd want it to right away, especially since it's explicitly offered as a replacement. I also don't believe that the supplier doesn't have a circuit diagram for it, if he can give recommendations for resistor assemblies in the same breath. That's typically Chinese: they copy themselves like world champions, but don't give anything away in return. --- End quote --- It isn't offered as a replacement. The seller suggested this LCD as a replacement based off the dimensions and the generic model number of the stock panel. It's not advertised as being specifically used with the Hioki. I also don't know how much they know about it. My guess is that they may have purchased the design files and manufactured based on that rather than having anything to do with the design of the product. They showed me a screenshot that clearly came from PCB design software, but they didn't seem to, or at least didn't admit to, understanding what the resistors do better than I understand now...and my understanding is still limited. I did a reverse google image search of the back of the LCD, and the panel came up with a few different model numbers, but clearly the same panel. Most of them were more expensive too. Still no datasheets for any of them. ETA: The ETA of the new touch panel is Mon or Tuesday next week. I hope it's a good one! |
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