Sharp LC-32WD1E/S/RU Service Manual page 44

LC-32WD1E/S/RU, LC-37WD1E/S/RU, LC-42WD1E/S/RU, and LC-32/37/42WT1E
NO picture on display via EXT-4 (YPbPr) input
No picture on LCD screen when EXT-4 YPbPr 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 EXT4
Are YPbPr signals arriving to pins 6(Y), 4(Pb) and 2(PR) on
connector X0215 ?
1. HD patch check
are YPbPr signals arriving to video switch TDA8601 (D1301)
at pins 3(Y), 2(Pb) and 4(Pr) ?
are YPbPr signals arriving to TDA9975AEL/10(D030), check on
capacitors: C033(Y), C034(Pb) and C030(Pr) ?
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
2. SD patch check
are YPbPr signals arriving to both sides of C0177(Pr), C0175(Y) and
C0164(Pb) ?
Is TDA15134E (D013) UOCV_DVCLK clock there
AND are the UOCV_DV(x) signals toggling?
are UOCV_DV(x) and UOCV_DVCLK signals arriving to
the CPLD (D080) (XC2C128-7TQG144C) ?
GOTO VIDEO PATH CHECK
on the remote control set up correctly ? ==> See operation manual and set "INPUT SOURCE" to "EXT4"
yes
yes
yes
yes
yes
yes
yes
yes
yes
Check external connection, input setting, YPbPr connector and
peripheral circuits.
no
check C1317(Y), C1313(Pb), C1321(Pr) and check other peripheral
no circuits on YPbPr signals
check YPbPr signals peripheral circuits (termination resistors, buffers
V030,V031,V032 and other peripheral circuits)
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
normal and check other peripherals (power supply,...) of D030
no
Check video switch TDA8601 (D1301) power supply (+8V_SW) and
no
Check if SLCT_RGB_YPbPr is set correctly
TDA15134E (UOCV) (D013) is not functioning normal,
no check GTV SW and peripherals (power supply,xtal,...) of D013
check resistor networks on UOCV_DV signals
no
6-13
XTAL,....)
peripherals