Sharp LC-32WD1E/S/RU Service Manual page 45

LC-32WD1E/S/RU, LC-37WD1E/S/RU, LC-42WD1E/S/RU, and LC-32/37/42WT1E
NO picture on display via EXT-5 (VGA) input
No picture on LCD screen when EXT-5 (15pin D-SUB terminal) input
source selected
Checklist:
1) Is "INPUT SOURCE" button
2) Is MENU-PICTURE-Contrast/Brightness set to "MIN" ? ==> Set it to appropriate level
3) Check connection to external device ==> Connect it correctly as per the operation manual for the device
4) Check if supported format is connected to EXT5.
Are the VGA RGB video signals and H and V sync signals present
on pins 1(R), 2(G), 3(G) 13(H) and 14(V) on connector X070 on main
PCB ?
Are VGA_RGB signals present on both side of C071(R),
C0380(G) and C072(B)?
Are H and V-sync signals present on both sides of R070(H sync) and
R0730(V sync) ?
Is Hirate_MCLK 13,5MHz clock present on R0368 ?
Is TDA9975AEL/10(D030) Hirate_CLK clock there on R0325?,
are the CS (R0328), HS (R0330) and VS (R0331) signals there ?
AND are the VPA(x), VPB(x) and VPC(X) signals toggling on the
network resistors R030-R034 and on R0310-R0318?
GOTO VIDEO PATH CHECK
on the remote control set up correctly ? ==> See operation manual and set "INPUT SOURCE" to "EXT5"
yes
yes
yes
yes
yes
yes
Check VGA (D-SUB-15) connector X070 and external connection.
no
Check peripheral circuits on the VGA_R, VGA_G and VGA_B
no
Check peripheral circuits on the VGA_HSYNC and VGA_CSYNC
no
Check PNX5010E (D040) SW and its peripherals (power supply,
no
TDA9975AEL/10 (Hirate) (D030) is not functioning normal,
check PNX SW, check if TM_SCL and TM_SDA are functioning
no
normal and check other peripherals (power supply,...) of D030
6-14
signals.
signals.
XTAL,....)