it's very interesting and it did help me already a lot to understand things about LCD televisions. I suspect T-con board, before I also thought of mainboard..
I am troubleshooting a Sony KDL-37V4000 and it has all the symptoms decribed here in this forum of a faulty T-con board (the AS15 issue). The screen has a white wash and the colors look inverted. All the AV inputs show the same thing and also the menu.
The T-Con board is from AUOpto and it has the AS15. The code is: T370XW02 VC CTRL BD.
I measured the Reference points and entered the values in the Excel from Tom66 and the outcome was "failure". The reference points don't show a monolitic line, actually it goes up and down...
These are the measured values:
VGL >> -6,01V
VGHC >> +26,53V
VCOM2 >> +6,53V
AVDD >> +15,60V
VGMA_REF >> +15,33V
REF_1 >> 15,33V
REF_2 >> 15,32V
REF_6 >> 13,39V
REF_7 >> 13,05V
REF_8 >> 12,94V
REF_10 >> 12,21V
REF_11 >> 7,33V
REF_12 >> 6,84V
REF_13 >> 14,21V
REF_15 >> 10,48V
REF_16 >> 9,85V
REF_17 >> 8,65V
REF_21 >> 0,933V
REF_F22 >> 0,310V
The namings and numberings of the testpoints are like I wrote them down, so some numbers seem to be skipped (they are not present on the PCB). In the Excel sheet I filled them in on row 1 till 14 (left VGMA_REF out). There was no video input connected, so I had the white wash screen with only the channel number some OSD info.
Can one (or more) of the more experienced forum members concerning this subject confirm to me that the readings of the testpoints are indicating a faulty AS15.....
Good Values
Just to let you know that changing the AS15 fixed the issue and the Sony KDL-37V4000 is working fine again. I measured the voltages of the reference points of the AUOpto T370XW02 VC CTRL BD again after replacing the AS15 for your information, indeed very different values now (see my earlier post for the wrong values):
VGL >> -6,01V
VGHC >> +26,52V
VCOM2 >> +6,53V
AVDD >> +15,61V
VGMA_REF >> +15,33V
REF_1 >> 15,33V
REF_2 >> 14,95V
REF_6 >> 10,48V
REF_7 >> 9,75V
REF_8 >> 9,50V
REF_10 >> 7,85V
REF_11 >> 7,33V
REF_12 >> 6,84V
REF_13 >> 6,32V
REF_15 >> 4,64V
REF_16 >> 4,36V
REF_17 >> 3,82V
REF_21 >> 0,380V
REF_F22 >> 0,309V
I am troubleshooting a Sony KDL-37V4000 and it has all the symptoms decribed here in this forum of a faulty T-con board (the AS15 issue). The screen has a white wash and the colors look inverted. All the AV inputs show the same thing and also the menu.
The T-Con board is from AUOpto and it has the AS15. The code is: T370XW02 VC CTRL BD.
I measured the Reference points and entered the values in the Excel from Tom66 and the outcome was "failure". The reference points don't show a monolitic line, actually it goes up and down...
These are the measured values:
VGL >> -6,01V
VGHC >> +26,53V
VCOM2 >> +6,53V
AVDD >> +15,60V
VGMA_REF >> +15,33V
REF_1 >> 15,33V
REF_2 >> 15,32V
REF_6 >> 13,39V
REF_7 >> 13,05V
REF_8 >> 12,94V
REF_10 >> 12,21V
REF_11 >> 7,33V
REF_12 >> 6,84V
REF_13 >> 14,21V
REF_15 >> 10,48V
REF_16 >> 9,85V
REF_17 >> 8,65V
REF_21 >> 0,933V
REF_F22 >> 0,310V
The namings and numberings of the testpoints are like I wrote them down, so some numbers seem to be skipped (they are not present on the PCB). In the Excel sheet I filled them in on row 1 till 14 (left VGMA_REF out). There was no video input connected, so I had the white wash screen with only the channel number some OSD info.
Can one (or more) of the more experienced forum members concerning this subject confirm to me that the readings of the testpoints are indicating a faulty AS15.....
Good Values
Just to let you know that changing the AS15 fixed the issue and the Sony KDL-37V4000 is working fine again. I measured the voltages of the reference points of the AUOpto T370XW02 VC CTRL BD again after replacing the AS15 for your information, indeed very different values now (see my earlier post for the wrong values):
VGL >> -6,01V
VGHC >> +26,52V
VCOM2 >> +6,53V
AVDD >> +15,61V
VGMA_REF >> +15,33V
REF_1 >> 15,33V
REF_2 >> 14,95V
REF_6 >> 10,48V
REF_7 >> 9,75V
REF_8 >> 9,50V
REF_10 >> 7,85V
REF_11 >> 7,33V
REF_12 >> 6,84V
REF_13 >> 6,32V
REF_15 >> 4,64V
REF_16 >> 4,36V
REF_17 >> 3,82V
REF_21 >> 0,380V
REF_F22 >> 0,309V
No comments:
Post a Comment
Note: only a member of this blog may post a comment.