
No. 5841-21/39
LA7615
Continued from preceding page.
Parameter
Symbol
Test point
Input signal
Test procedure
Bus bits/input signal
[OSD Block]
OSD fast switching threshold
RGB red output level
RGB green output level
RGB blue output level
Analog OSD red output level
Gain matching
Linearity
Analog OSD green output level
Gain matching
Linearity
Analog OSD blue output level
Gain matching
Linearity
[RGB Output Block]
(Cutoff and Drive Blocks)
Brightness control
(normal)
(maximum)
(minimum)
FSTH
ROSDH
GOSDH
BOSDH
RRGB
LRRGB
GRGB
LGRGB
BRGB
LBRGB
BRT32
BRT63
BRT0
L-0
O-2
L-50
L-0
O-2
L-50
L-0
O-2
L-50
L-0
O-2
L-0
O-1
L-0
O-1
L-0
O-1
L-0
Gradually increase the pin 39 voltage starting at 1.5
V, and determine the pin 39 voltage at the point
where the output signal switches to the OSD signal.
Measure the 50 IRE amplitude in the output signal.
(CNTCR Vp-p).
Measure the OSD output amplitude (OSDHR Vp-p).
Calculate ROSDH = 50 × (OSDHR/CNTCR).
Measure the 50 IRE amplitude in the output signal.
(CNTCG Vp-p).
Measure the OSD output amplitude (OSDHG Vpp).
Calculate GOSDH = 50 × (OSDHG/CNTCG).
Measure the 50 IRE amplitude in the output signal.
(CNTCB Vp-p).
Measure the OSD output amplitude (OSDHB Vp-p).
Calculate BOSDH = 50 × (OSDHB/CNTCB).
Measure the amplitudes at point A (the 0.35 V
component of the input signal O-1) and point B (the
0.7 V component of the input signal O-1) in the
output signal and record these as RGBLR and
RGBHR (Vp-p) respectively.
Calculate RRGB = RGBLR/CNTCR.
Calculate LRRGB = 100 × (RGBLR/RGBHR).
Measure the amplitudes at point A (the 0.35 V
component of the input signal O-1) and point B (the
0.7 V component of the input signal O-1) in the
output signal and record these as RGBLG and
RGBHG (Vp-p) respectively.
Calculate GRGB = RGBLG/CNTCG.
Calculate LGRGB = 100 × (RGBLG/RGBHG).
Measure the amplitudes at point A (the 0.35 V
component of the input signal O-1) and point B (the
0.7 V component of the input signal O-1) in the
output signal and record these as RGBLB and
RGBHB (Vp-p) respectively.
Calculate BRGB = RGBLB/CNTCB.
Calculate LBRGB = 100 × (RGBLB/RGBHB).
Measure the output signal 0 IRE DC levels of the R
output (pin 36), G output (pin 37), and B output (pin
38) and record these as BRTPCR, BRTPCG, and
BRTPCB (V), respectively.
Calculate
BRT63 = (BRTPCR + BRTPCG + BRTPCB)/3.
Measure the output signal 0 IRE DC level of the B
output (pin 38) (BRTPHB).
Calculate
BRT63 = 50
× (BRTPHB – BRTPCB) / CNTHB.
Measure the output signal 0 IRE DC level of the B
output (pin 38) (BRTPLB).
Calculate
BRT0 = 50
× (BRTPLB – BRTPCB) / CNTHB.
Pin 42: Apply signal
O-2.
Pin 39: Apply 3.5 V.
Pin 40: Apply signal O-2.
Pin 39: Apply 3.5 V.
Pin 41: Apply signal O-2.
Pin 39: Apply 3.5 V.
Pin 42: Apply signal O-2.
Pin 39: Apply 3.5 V.
Pin 40: Apply signal
O-1.
Pin 39: Apply 3.5 V.
Pin 34: Apply signal
O-1.
Pin 39: Apply 3.5 V.
Pin 41: Apply signal
O-1.
TR24: Contrast
111111
TR23: Brightness
111111
TR23: Brightness
000000
38
36
37
38
36
37
38
36
37
38
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