Hello everyone, I'm trying to troubleshoot this LG hometheater player.
The customer forced her USB drive reversed into it's USB socket and since then the player won't work properly, only shows "Please wait" error forever on it's display.
Now I started diagnosing the USB socket and the mainboard where it's connected.
I found 20ohm resistance to ground on the 5V line of the USB.
5V is missing and I found the buck converter of the USB line, TPS65252 IC.
After measuring the pins I realized that both VIN and 3V3 is correctly present but LX1 (which is for the USB I assume) has 20ohm to ground.
However after reading about this error "Please wait" it turns out it's a CPU/Memory problem usually with these models. So I wanted to sort out this possibility before I proceed to replace the buck converter.
I tracked the USB port's D- and D+ lines on the mainboard and they go directly to a Mediatek MT85601aa microcontroller.
NOW this is where I turn to you for some help guys.
What do you think? Is it the Mediatek microcontroller where it's probably a no fix or it's the low resistance to ground at LX1 on the TPS65252?
Thank you in advance!
The customer forced her USB drive reversed into it's USB socket and since then the player won't work properly, only shows "Please wait" error forever on it's display.
Now I started diagnosing the USB socket and the mainboard where it's connected.
I found 20ohm resistance to ground on the 5V line of the USB.
5V is missing and I found the buck converter of the USB line, TPS65252 IC.
After measuring the pins I realized that both VIN and 3V3 is correctly present but LX1 (which is for the USB I assume) has 20ohm to ground.
However after reading about this error "Please wait" it turns out it's a CPU/Memory problem usually with these models. So I wanted to sort out this possibility before I proceed to replace the buck converter.
I tracked the USB port's D- and D+ lines on the mainboard and they go directly to a Mediatek MT85601aa microcontroller.
NOW this is where I turn to you for some help guys.
What do you think? Is it the Mediatek microcontroller where it's probably a no fix or it's the low resistance to ground at LX1 on the TPS65252?
Thank you in advance!
Attached Files