Re: TCL 55S405TBBA - backlights on, no video; T-con and main board replaced.
Good morning all -
I wanted to give you a quick update on the TV from yesterday night:
Setup
1. Both T-CON cables were connected in all cases.
2. Instead of masking off the pins, I reworked the T-CON itself. There are 0-Ohm resistors populated in series with each of the Vxxx pins.
I removed one resistor at a time. This guarantees the target Vxxx pin is "disabled" from the LCD perspective without worrying about the tape shifting. The resistor was reinstalled before going to the next one.
VCM_CB and VCM_XB are sourced from the same location (IC5 on the left side). IC8 is not populated on the board. R211 bridges VCM_CB to VCM_XB.
No change was observed on the display. The display was still black.
Good morning all -
I wanted to give you a quick update on the TV from yesterday night:
Setup
1. Both T-CON cables were connected in all cases.
2. Instead of masking off the pins, I reworked the T-CON itself. There are 0-Ohm resistors populated in series with each of the Vxxx pins.
I removed one resistor at a time. This guarantees the target Vxxx pin is "disabled" from the LCD perspective without worrying about the tape shifting. The resistor was reinstalled before going to the next one.
Code:
Rail name RefDes,PAKSize,Value VGL R167, 0805, 0-Ohm VGH R165, 0603, 0-Ohm HVAA R177, 0805, 0-Ohm VCM_CB/XB R211, 0805, 0-Ohm
No change was observed on the display. The display was still black.
Comment