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Teclast T51 - Page 85  

post #1261 of 1468

Would love to do this. But alas, no expertise. Might attempt to change the crappy caps though...

post #1262 of 1468

I think that if you use only the line-out of player is enough to replace opa2604, inverters, red capacitors, and 5 volt stabilizers.

post #1263 of 1468

Can i ask if it is possible to do everything except replace the headphone amplifier? Oh and im not sure i understand number 1? Do i replace the red circled caps to ceramic 10uf or 0.1uf?

post #1264 of 1468

4 green small caps remove, 8 red replace with ceramic murata smd 1206 0.1uf caps.

img6328ra.jpg

After (4 deleted caps - black arrows)

Remove img6847d.jpg

post #1265 of 1468

just food for thought, maybe opa2604 can be directly replaced with opa1612 smily_headphones1.gif

post #1266 of 1468
Quote:
Originally Posted by w357 View Post

4 green small caps remove, 8 red replace with ceramic murata smd 1206 0.1uf caps.

 



Wow... Those caps cost around $1 USD each from where i am. Is it necessary to use 0.1uf?

post #1267 of 1468
Yes, dont need more for wolfson & amps. Y can see the same 0.1uf caps in mini3 smily_headphones1.gif
post #1268 of 1468

Then how about 0.1uf film/electrolytic/tantalum caps. If i can find one with similar size?

 

Anyway i think the best way to bypass the battery spark problem is to completely drain the battery before modding.

 

Update: Opened my T51 today with minimal or no scratches. This link really helped. http://www.soomal.com/doc/10100001217.htm


Edited by Cryok95 - 1/29/12 at 1:00am
post #1269 of 1468

Dont replace with electrolytic capacitors. Can be replace with a film cap but it makes no sense.

Discharge the battery does not make sense also :D At least 6.4 volts will left on the battery.

post #1270 of 1468

Modern battery are protected to avoid a full discharge that will permanently damaging it.

post #1271 of 1468


I see, kk plan foiled lol.

Quote:
Originally Posted by w357 View Post

WARNING! installing low-pass filter amplifier to its outputs (1 and 2 in the photo) to the level above the board! they should not be soldered to the board (in air)!



Anyway forgive me for asking but i dont really understand this part. Could you care to explain?

post #1272 of 1468
Dont solder legs 1&2 to board, two wires from this legs must direct connect to sound control. Блин, моя-твоя не понимать и как написать про ООС(((
post #1273 of 1468
en.m.wikipedia.org/wiki/Negative_feedback don't need more for line out)
post #1274 of 1468

I see. So connect pins 1 and 2 to the sound control in this pic? (Can help me mark out which wire goes where etc?)

45bafff0_img6843vn.jpeg

 

Oh and do i have to etch the pcb for the amp circuit? If yes, then i rather not touch the amp.


Edited by Cryok95 - 1/29/12 at 7:05am
post #1275 of 1468

img6843vn 00.jpg

For this mod Y must to do (see in the original theme) pcb. You can do a minimum mod - points 3, 5, 6, 7. And replace in second point opa 2604 with LM6172 or LM4562. Did you think this is easy?)

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