Thrustmaster T150 racing wheel pcb faulty (no voltage to cpu)

Hi!

The wheel is not recognized by the PC and does not show any signs of life.

The USB 5V and PSU 25V are present but later the voltage "gets lost".
I'm thinking the wheel's PCB probably has a short circuit somewhere.

Pins 8 and 44 on the CPU which are the VDD do not have any voltage.
Retracing back to coil which supposedly converts 24->12V also have no voltage present.
Also half of the "big" caps at the start of the supply lane don't get any reasonable voltage.

Hoping to get some pointers on finding out / fixing the problem. I don't have a strong background on electr(on)ic stuff, but I can solder and have a fairly good multimeter to work with.

A picture is worth a thousand words so here are they:
T150_bo...jpg Download (5.1 MB)
IMG_201805...233250.jpg Download (6.15 MB)

Pinout of the main chip
lpc11u35_p..out.png Download (82.77 kB)

Thanks in advance!

I got the steering wheel with an identical case. The protection diode between the ground and the 3.3V coil, marked with a red arrow, turned out to be short. After its removal, the steering wheel came to life. There should be 3.3V voltage on the L1 coil, not as the predecessor wrongly marked 12V !!! The fault is simple enough to be diagnosed in a few minutes using a short circuit test and a freezer

Hello, how are you? Thanks for your posts, you are helping me to fix my t150. I would need some help. Could you tell me the nomenclature of transistor Q13 and resistor VR31? Thanks a lot!

pablonicolasmarcos wrote:

Hi, how are you? Thanks for your posts, you help me fix my t150. I need help. Could you please tell me the naming of transistor Q13 and resistor VR31. thanks a lot!

Unfortunately, I do not have this steering wheel anymore and I am not able to help. Excuse me