Sharp DV-HR300U, Service Manual

Page: 15 / 76

15
DV-HR300U
6. TROUBLE SHOOTING
FLOW CHART No.1
With power on, circuits on main PWB do not work properly
.
Power turns of
f approx. 5 seconds after turned on.
NO
NO
Are voltages of 3.3V (VDDP3.3, VDDADC3.3, VDDP_A3.3) and 1.8V (VDDC1.8) applied to pins of IC7506? After power on, is 154_RS signal ("H"
→
"L"
when reset) input to IC7506 pin 257?
YES
Reset Check
Is IC7506 pin 279 BOOTSEL1 at "L" level and pin 278 BOOSTSEL0 at "H" level?
YES
With power on, is data input to IC7506 pins 81, 82, 86, 87, 91-94, 96-98, 101-104 and 108 (RAMDA
T
[31:16])?
YES
Is serial communication established between IC7506 and sub unit IC501? IC7506 pin 34 FPCDOUT
(SUBMIC_D_OUT)
IC7506 pin 36 FPCSTB (SUBMIC_CS) IC7506 pin 38 FPCCLK (SUBMIC_CLK) IC7506 pin 39 FPCDIN (SUBMIC_D_IN)
YES NO NO NO NO NO
Is reset signal ("H"
→
"L" when reset) input to
pins of each IC? IC3502 pin 84
YCDEC_RST
IC7304 pin 151 ENCRST IC4005 pin 1 DV_RST IC3009 pin 5 DACADC_RST IC3005 pin 13
AD_RST
NO
With power on, is fan running?
Fan is defective or power supply failure.
Check D_3.3V (1) and 1.8V lines (IC7506).
Check IC4501 and peripheral circuits.
Check 154_RST
line between IC501 pin 98 and
IC7506 pin 257.
Check BOOTSEL1 (DOWN L
[H]) line between IC501
pin 22 and IC7506 pin 257 as well as BOOTSEL0 line between Q7507 collector and IC7506 pin 278.
Check lines between pins of IC7502 and IC7506. Check lines between pins of IC7506 and sub PWB IC501. IC7506 pin 34
←
IC501 pin 16
TU_D_OUT
IC7506 pin 36
→
Q532, 533
→
IC501 pins 2, 3
TU_CS
IC7506 pin 38
→
Q534, 535
→
IC501 pin 14
TU_CLK
IC7506 pin 39
→
Q536, 537
→
IC501 pin 15
MAIN_DA
T
A
YES
With power on, is data input to IC7506 pins 63, 64, 66-69, 73 and 74 NVMDA
[7:0]?
After power on, is reset signal ("H"
→
"L"
when reset) input to IC4501 pin 54? IC4501 pin 54 SV_RST
YES
NO
Check lines between pins of IC7509 and IC7506. Check SV_RST
line between IC7506 pin 29 and
IC4501 pin 54.
YES
NO
Is 27MHz clock signal input to pins of the following ICs? IC7506 pins 252, 256 27MHz_OSC IC7304 pins 28, 34 MPENC_SCLK IC4005 pins 50, 202 INVCK4
Check lines between pins of IC4501 and other ICs. IC4501 pin 1
13
→
IC3502 pin 84
YCDEC_RST
IC4501 pin 139
→
IC7304 pin 151 ENCRST
IC4501 pin 78
→
IC4005 1 pin DV_RST
IC4501 pin 99
→
IC3009 pin 5 DACADC_RST
IC4501 pin 64
→
IC3005 pin 13
AD_RST
NO
Check IC7506 and peripheral circuits.
NO
YES
YES
YES
NO
Check X3001 and peripheral circuits. Check IC3004 and peripheral circuits.
Is 27MHz clock signal output to X3001 pin 4?
NO
Check X3502 and peripheral circuits.
Is 27MHz clock signal to each pin of IC3004? IC3004 pin 14 27MHz_OSC IC3004 pin 18 MPENC_SCLK IC3004 pin 16 INVCK4 Check lines between pins of IC3004 and other ICs. IC3004 pin 14
→
IC7506 pins 252, 256 27MHz_OSC
IC3004 pin 18
→
IC7304 pins 28, 34 MPENC_SCLK
IC3004 pin 16
→
IC4005 pins 50, 202 INVCK4
NO
YES
NO
Check IC7506 and peripheral circuits.
NO
YES YES
YES
Is 27MHz clock signal input to IC4501 pins 18, 91? IC4501 pins 18, 91 SBCLK Is 135MHz clock signal PCLK input to IC7510/ 751
1pin 38?
Is 24.576MHz clock signal output on IC3502 pin 43?
NO
Check IC7506 and peripheral circuits.
Is 135MHz clock signal PCLK output to IC7506 pin 134? Check SBCLK (RP_SBCLK) line between IC7506 pin 208 and IC4501 pins 18, 91. Check lines between IC7506 pin 134 and IC7510/ 751
1 pin 38.
NO
YES
Clock Check
Clock Check
After power on, is reset signal ("H"
→
"L" when reset)
output to IC7506 pin 79? IC7506 pin 79 SV_RST
1
1
Is reset signal ("H"
→
"L" when reset) output to each
pin of IC4501? IC4501 pin 1
13
YCDEC_RST
IC4501 pin 139 ENCRST IC4501 pin 78 DV_RST IC4501 pin 99 DACADC_RST IC4501 pin 64
AD_RST
NO
Is 27MHz clock signal output to IC7506 pin 208? IC7506 pin 208 RP_SBCLK