Toshiba 42HM66 - 42" Rear Projection TV, Service Manual

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2.2.2.1.4.3 In Crosshatch pattern, it should be no visible noise.
2.2.2.1.4.4 In Multi burst pattern:
a. In low bandwidth pattern, there are have same dots on the edge transitions which are acceptable.
b. In high bandwidth pattern, there are cannot loss any resolution and the scaling should be correct.
2.2.2.1.4.5 In Black & White, there is no any trouble at edge transition.
2.2.2.1.4.6 In Gray Scale pattern, the gray scale should not be saturation.
2.2.2.1.4.7 Apply cable TV or RF pattern generator signal and the RF sensitivity set to 45 ~85dBµV, the image
should be displayed.
If under 60dBµV, the image had snow noise was acceptable but can not loss any color.
2.2.2.1.4.8 TV Channel Auto Scan
a . The NTSC system TV channel and frequency table as 2.4 TV Channel Table
2.2.2.1.4.9 V-Chip & Close caption function test:
a. Close caption:
a.1 Select the “Close Caption” (In main picture OSD) to CC1, CC2, CC3, CC4, TT1, TT2, TT3, TT4.
a.2 Setting the FLUKE 54200 or VG848 / 858 function to CC number 1, CC number 2, CC number 3, CC
number 4, CC number 5, CC number 6, CC number 7, CC number 8, the function should be normally. Or
a.3 Used signal center channel with CC function. TV select to same CC number with signal center.
b. Parental Control
b.1 Select the “Parental Control” in OSD and key in password “2097” enter to the TV rating and setting all
the rating to “LOCKED”.
b.2 Setting the FLUKE 54200 or VG848 / 858 or used signal center channel with CC Sequence, the image
will be locked and show key in password and rating message. After key in password and the password is
correct, the image will display again.
2.2.2.1.5 Distortion test:
a. Apply green cross hatch pattern.
b. Distortion spec:
b-1. Tilt spec: (Parallelogarm)
|A-K| <=5mm |E-G| <=5mm.
|B-D| <=5mm |J-H| <=5mm.
b-2. Keystone spec:
|(A+E) - (K+G)| <= 6mm.
|(B+J) - (D+H)| <= 7mm.
b-3. Distortion spec: (Pincushion and Barrel)
|(A-L) + (K-L)| /2 less than 5mm.
|(E-F) + (G-F)| /2 less than 5mm.
|(B-C) + (D-C) |/2 less than 4mm.
|(J-I) + (H-I)| /2 less than 4mm.
FIG.7
b-4. Position spec:
H position: |C-I| <= 8mm.
V position: |L-F| <= 10mm.