Sony VPL-HS20 - Service Knowhow; After Replacing the Prism Block; After Replacing the Board

1-14
VPL-HS20
1-4. Service Knowhow
1-4-1. After Replacing the Prism Block
1. Perform Section “2-2. V COM Adjustment.”
2. Perform the Look Up Table or 3D GAMMA data
writing of the Prism Block.
3. Perform Section “2-4. White Balance Adjustment on
Servicing.”
1-4-2. After Replacing the Board
. Refer to the cross table shown on right.
. There are no need to perform the adjustment when the board
other than the B board or C board had been replaced.
1) When Replacing the B Board
When the data before replacement can be read properly
1. Make a note of the data before replacement. After
replacement, write the data into the new board with
service mode.
2. If the white balance is extremely deteriorated, perform
the white balance adjustment (Refer to Section 2-4.).
When the data before replacement cannot be read
1. Perform Section “2-2. V COM Adjustment.”
2. Perform Section “2-4. White Balance Adjustment on
Servicing.”
3. Perform Section “2-5. Tilt Adjustment.”
2) When Replacing the C Board
1. Before replacement, unsolder the IC705 from the
replaced C board and then mount it to the new board.
2. Perform Section “2-2. V COM Adjustment.”
3. If the white balance is extremely deteriorated, perform
the white balance adjustment (Refer to Section 2-4.).
4. Perform Section “2-5. Tilt Adjustment.”
3) When Replacing the Other Board
There are no need to perform the adjustment.
Cross Table of Board Replacement
Board Name
Device Name Item Name B C
OTHER TILT C0 * O
TILT C1 * O
TILT C2 * O
P.DRV VCOM (R) * O
VCOM (G) * O
VCOM (B) * O
W/B ADJUST
INPUT-A HIGH GAIN R * O
GAIN G * O
GAIN B * O
BIAS R * O
BIAS G * O
BIAS B * O
INPUT-A LOW GAIN R * O
GAIN G * O
GAIN B * O
BIAS R * O
BIAS G * O
BIAS B * O
INPUT-A HIGH GAIN R * O
GAIN G * O
GAIN B * O
BIAS R * O
BIAS G * O
BIAS B * O
INPUT-A MID GAIN R * O
GAIN G * O
GAIN B * O
BIAS R * O
BIAS G * O
BIAS B * O
VIDEO MID GAIN R * O
GAIN G * O
GAIN B * O
BIAS R * O
BIAS G * O
BIAS B * O
VIDEO LOW GAIN R * O
GAIN G * O
GAIN B * O
BIAS R * O
BIAS G * O
BIAS B * O
* : When down the data before replacement, and then
write in the data after the board replacement.
O : Need adjustment
Value: See description.