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Board Removal
A
Input Video & DVD
The A board is plugged into
switching, Y/C separation,
the G board and secured
Closed Caption, Main and
with a plastic L bracket.
Sub tuners and picture
Remove the plastic L
processing.
bracket from the G board by
squeezing the tabs under
the G board.
V
Digital processing for
The V board is plugged into
standard definition (525 line)
the G board. Pry the socket
input, PIP processing.
tabs outward while rocking
the V board out.
B
Main Micro Processing,
The B board is plugged into
Sound Effect Processing for
the G board and secured
Dolby inputs,
with a plastic L bracket.
Video Processing,
Remove the plastic L
Video & some deflection
bracket from the G board by
memory.
squeezing the tabs under
the G board.
Note that white connectors
CN3002 & CN3007 are not
used.
Board Replacement
Functions
Possible Failure Symptom(s)
1. Loss of color, or luminance (B & V boards also
possible).
2. Inability to receive TV, PIP, Video, DVD or standard
definition (SD) Digital TV. (B board also possible).
3. No closed caption in the main or sub pictures.
1. Solariztion (bright splotches in the picture).
2. Large squares in the picture.
3. One picture missing in twin view (A board also
possible).
4. Noise in the main picture but not in the Twin View.
5. Loss of color, or luminance (A & B boards also
possible).
6. Standby light blinks 6 times pauses and repeats
(+5VOCP)
1. No OSD menu or channel numbers (also no sync from
D, or M, board).
2. No or constant audio or video muting.
3. Inconstant contrast or color between the Twin View
pictures, Full width NTSC and DTV pictures.
4. Distorted or no sound effects (Thru-Sourround and
Simulated).
5. Can not select Main Video and/or HDTV video signal
from the set-back box (Setback box also possible).
Sound switches OK but no video.
6. No vertical or horizontal sync (M board also possible).
7. Will not hold last volume level at power off.
8. Will not hold individual settings for the 7 picture sizes
(normal, full, zoom, etc).
9. Standby light blinks 5 times pauses and repeats (IK
white balance failure).
After board replacement
May have to program TV stations in
again for faster station capture.
Verify PIP, DVD and Video inputs
work.
Verify main NTSC and Twin View
pictures.
Transplant shielding to new board.
Check to see that contrast and color
levels are similar when switching
between NTSC and DTV pictures. If
not, follow the procedure is on pages
___ of the adjustment manual.
♦
Transplant memory IC3252 in an
anti -static atmosphere or
♦
Enter the service mode and press
08 enter to load defaults into a
blank memory.
♦
Adjust the contrast, color level and
hue for the two Twin View
pictures, Full width NTSC and
DTV picture so the picture is of
equal contrast and color intensity
as the pictures are switched. The
procedure is on pages ___ of the
adjustment manual.
♦
Perform the size adjustments for
all the 7 picture sizes (normal, full,
zoom, etc) on pages _____ of the
adjustment manual.
iv
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