Newision/Lilliput 7" mainboard problem

Mineque · 08-13-2007, 10:17 AM

First of all i want say hello to mp3car.com community

I've got problem with my touchscreen. i was making vga/usb -> newision cable and sth goes wrong and one condensator has blowned it's number on the board is 8C06. But i don't know what parameters is has, so i couldn't replace it by new one.

cdcamaro9534 · 08-13-2007, 09:23 PM

It looks like it might be a .1uf cap. Most of the caps on these boards are that value to filter out noise. Take a ohm meter and measure one side of the pad to ground, then the other. If one of the pad go to ground then it will most defiantly be a .1uf. Seeing a 471 resistor which is 470 ohms, I'd bet this is part of some regulator circuit. If it don't go to a ground plain, ohm it out and tell me what component it goes to. I can get you close.

One good thing about this is it might not be too critical what the value is, I'd say it's a 90% chance it's a .1uf, but even if it isn't the circuit will still probably work with that value.

Another thing you could do is remove the cap 8C05, and check it with a capacitor meter. It will be the same value of 8C06 since these four components are probably apart of the came circuit.

Another thing to check is the fuse on the board. Chances are it's labeled as F1. It will be the same size of the cap's and resistor's, but will probably look orange. If you gave the unit a good jolt of voltage, chances are you might have taken that out to. Just check across it with a ohm meter and you should get something under 1 ohm.

Hope this can get you started, let me know what you find and I'll see if I can help ya more.

(EDIT: Actually thinking about it, with a 470 in there, it probably is used as some load resistor thats in series of a data line, but this still requires a filtering cap.)