AUO TCON 50T03-C0G T500HVN-1.7 schema + smd ...

[PKTKS]

Have a TCON with lots of magic smoke coming from Q202

Any help welcome.. schematic for this TCON or close
any replacements for Q202.
datasheet for AUO regulator...

Thnkx
Paul

[PKTKS]

One thing I dislike smd over tht ...   

the inner board always melt due to the planar method...

insane waste of time curing it

Paul

[PKTKS]

Saved from landfills..   let's see for how long it holds...

The regulator just went wacko cracking things all over..
serious smoke

It has become incredibly tricky to find parts for such boards...
The OEM just have no support.. no replacements...

Tricky business

Paul

[fzabkar]

I don't know if this will help ...

AUO-P301.30, Advanced Analog Technology Inc, 4-channel TFT LCD power solution, WQFN28-5x5:
https://www.520101.com/files/newfile/20190216/11bd7e6871e8190e87f1192e5c6dea4b.pdf

As I understand it, "W5" is a P-channel MOSFET which is being used as a high side load switch for AVDD.

[PKTKS]

Thanks a lot  fzabkar  anything helps...

I stressed all searches without a single match for W5222 (or W5 222 or permutations..)

There is ZERO support or references for such codes

The clue to replace came from other brazilian repair forum with a similar TCON.

It is indeed a MOSFET and possible replacements are:   25C41 or 25C222
also with zero datasheet or reference...

I manage to find some.. and repaired the board as possible..

So far  it was saved from landfills and working fine...
all voltages are within expected values..  panel working  as expected

The BIG caps are all 20uF  the smaller  4u7F  (for future ref)

As i could realize this particular TCON has this typical fault quite a lot.
and all similar models. (they have a lot)

OEM  support is ZERO.  And the most common procedure is replace the board... (from them)

So ...expect  a lot in landfills...

 
Paul


BTW..  if you know the OEM reference for the COILS (all coils) in this board...
please put  some here...   it seems that COILS are shit.. they crack with thermal stress and age..

very hard to find equals

[fzabkar]

I suspect that the part code is "W5", and "222" is a YWW (Year/Week) date code. The date codes of the other ICs are 1214, 241, 238, and the date code of the PCB is 1240.

I found some 40V, 2A, P-channel, SOT23-3 MOSFETs that would probably suit the application (at Digikey and Mouser). They are specified for load switching. In fact a 30V MOSFET would probably have sufficient margin. Your suggested replacements (25C41 or 25C222) make no sense to me. :-?

[PKTKS]

I suspect that the part code is "W5", and "222" is a YWW (Year/Week) date code. The date codes of the other ICs are 1214, 241, 238, and the date code of the PCB is 1240.

I found some 40V, 2A, P-channel, SOT23-3 MOSFETs that would probably suit the application (at Digikey and Mouser). They are specified for load switching. In fact a 30V MOSFET would probably have sufficient margin. Your suggested replacements (25C41 or 25C222) make no sense to me. :-?

Actually these are the MOSFETS found on other AUO boards just slight different from this..

Scrap yards have dozen of these where I could got the MOSFETS.

The code printed is just like that 25C41 and 25C222
Can't  tell anything from the original... W5222 or the others...

But they do work (the core regulator is the same) and interchangeably

The COILS..  well the coils are other problem...

The panel is working right on spot at normal nominal values.. with that other MOSFET...
Got the tip from brazilian forum .. common issue on these AUO boards...

it is even cool at thermal cam
Paul

[fzabkar]

I understand now. I mistook them for part numbers rather than part markings.

I would think any one of the following parts would be suitable:

https://au.mouser.com/c/semiconductors/discrete-semiconductors/transistors/mosfet/?id%20-%20continuous%20drain%20current=2%20A~~7.6%20A&number%20of%20channels=1%20Channel&package%20%2F%20case=SOT-23~~SOT-23-3&transistor%20polarity=P-Channel&vds%20-%20drain-source%20breakdown%20voltage=30%20V~~80%20V&instock=y&rp=semiconductors%2Fdiscrete-semiconductors%2Ftransistors%2Fmosfet%7C~Package%20%2F%20Case%7C~Id%20-%20Continuous%20Drain%20Current%7C~Vds%20-%20Drain-Source%20Breakdown%20Voltage

This part looks very robust:

https://au.mouser.com/datasheet/2/427/si2369bds-1766830.pdf