Focus Adjustment; Screen (G2) Adjustment - Sony TRINITRON KV-VF21M40 Service Manual

• Adjust TLH. (TLH CORRECTION PIECE : 4-057-714-01)
Correct horizontal mis-convergence of X axis' right and left
red and blue. When red is outside and view from DY neck side,
insert TLH correction piece to rightside (TLH+) and when blue
is outside and also view from DY neck side, insert TLH
correction piece to left (TLH-).
• Adjust YCH. (YCH)
Adjust the horizontal convergence of red and blue of Y axis'
up and down part.
(Adjust with tracking)
TLH
Fig.3-6
(2) Convergence adjustment of screen surroundings.
(Dynamic convergence)
1. Adjust by the deflection yoke (swivel) to screen both sides
cross mis-convergence become finest whole screen.
(Fig.3-7)
2. Fix the deflection yoke to insert the wedge to the picture
tube funnel and the deflection yoke. (Fig.3-8)
R
B
G
R
B
G
R G B B R
B
R
G
B
R
Fig.3-7
YCH
TLH correction
piece
CV board
RV701
B
G R
G
G B
R
B G R R G B
R
G B
G
R
G
B
a
a-d : screen-corner
misconvergence
c

3-3. FOCUS ADJUSTMENT

1. Receive PAL MONOSCO signal, with standard condition.
2. Focus adjustment should be balanced whole picture area (not
detail), and adjust focus by [FOCUS] VR of FBT. (Fig.3-9)
3. Receive ALL WHITE signal.
4. Magenta ring should be within limit sample. (Fig.3-9)
<If out of limit>
Tracking adjust magentaring and the focus by [FOCUS] VR of
FBT.

3-4. SCREEN (G2) ADJUSTMENT

1. Receive white signal and make standard condition.
2. Set service data to VP38 (RON), VP39 (GON), VP40 (BON) =
"00" and take care that the screen become pitch-dark.
3. Add 175 1.0VDC external voltage to cathodes of red, green,
blue.
4. Adjust to obtain just before retrace line goes out (The point
where the retrace line is going to appears). (Fig.3-9)
5. Set service data to VP38 (RON), VP39 (GON), VP40 (BON) =
"01".
– 70 –
a
b
b
d
c
d
Fig.3-8
Focus
Screen
Fig.3-9