BD-HP75U
4 – 1
BD-HP75U
Service Manual
CHAPTER 4. TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
Flowchart 1
Main PWB failure to get started.
Are there 12V inputs at pins 1, 2 and 3 of
SC9001?
NO Check the power unit and harnesses.
YES
Is there AT5V output at TL9019? NO Check IC9004 (DC-DC converter for
AT5V) and its peripheral circuits.
YES
Are there 3.3V output signals coming
from pin 15 (MAIN_P-CON) of IC2501
(front microprocessor)?
NO
Is there 3.3V input signal coming from pin
40 (reset) of IC2501 (front microproces-
sor)?
NO
Check IC2502 (reset IC) and its
peripheral parts.
YES
YES
Is there 16MHz oscillation waveform at
pins 43 and 44 (clock) of IC2501 (front
microprocessor)?
NO
Check FL2501 (ceramic oscillator)
and its peripheral parts.
YES
Check the power of IC2501 (front micro-
processor), grounding and their periph-
eral circuits.
Is there D1.1V (PC) output at TL9016? NO Check IC9001 (1.1V DC-DC converter)
and its peripheral circuits.
YES
Is there D1.8V (PC) output at TL9018? NO Check IC9003 (1.8V DC-DC converter)
and its peripheral circuits.
YES
Is there D3.3V (PC) output at TL9017? NO Check IC9002 (3.3V DC-DC converter)
and its peripheral circuits.
YES
Is there 3.3V input at AF2 (reset) of
IC7201 (system LSI)?
NO
Is there 3.3V output signal coming from
pin 20 (COLD_RESET) of IC2501 (front
microprocessor)?
NO Check R7239, IC2501 (front micropro-
cessor) and their peripheral circuits.
YES
YES
Check the wiring and soldering conditions
along the COLD_RESET line.
Is there an input of about 1.6V along the
Y18 (D1CKERSTB) and N20
(D0CKERSTB) lines of IC7201 (system
LSI)?
NO
Check the soldering condition of R7211,
R7280, R7212 and R7281.
YES
Is there 48MHz oscillation waveform at
X7201 (crystal oscillator)?
NO
Check the A2 and A3 (XO/XI) terminals of
IC7201 (system LSI) and their peripheral
parts.
YES
Are the signals as specified along the
AA6 (FRONT_RXD), AC6 (FRONT_TXD)
and AE6 (FL_BUSY) lines of IC7201
(system LSI)?
NO
Check the relevant terminal of IC7201
(front microprocessor) pins 21
(FRONT_TXD), 22 (FRONT_RXD) and
37 (FL_BUSY) of IC2501 (front micropro-
cessor).
Check IC8502 (NAND_FLASH), IC7801-
4 (DDR2 MEMORY) and their peripheral
circuits.
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