Samsung ST436WMX/GAP Service Manual page 47

5. AD9884
- Check power is supplied (3.3V)
- Check I2C-bus (pins 29, 30)
- Check PC signal, HD-component signal is input.
- Check I2C-bus. (pins 29, 30)
- Check the input signal GREF (pin 40). The GREF signal applies to a fixed form of the input H sync signal.
- Check the output signal GFBK (pin 117). The FFBK signal applies to a fixed form of PLLd H sync signal.
- Check the output signal GCLK (pin 115). GCLK is differently seen according to the PC input signal format (VGA,SVGA,XGA).
GCLK=15MHz ~ 50MHz This value is apparently half of the clock frequency of the relevant PC input signal format.
- Check digital data output.
6. PW364 Reset
- When the Reset switch is pressed, if OTP01 (29LV160T) pin 28 (TP151) undergoes transition,
PW364 operates and OTP01 also does. Unless transition happens, however, it means PW364 is not operating.
7. PW364 Communication
- Operate the PC hyper terminal. Settings are as follows:
Model Selection: Direct connect to com1
No. of Bit per second: 57600
Data Bit: 8
Parity: None
Stop Bit: 1
Flow Control: None
- Whenever the Reset switch is pressed, the following is displayed on the PC hyper terminal screen.
CBooter V1.5 & 2000.01.26
CBooter V1.5 & 2000.01.26
CBooter V1.5 & 2000.01.26
8. Check the signal output from PW364 and the signal input to ICD119 (DS90C385).
- DCLK (ICD119 pin 31) = 65 MHz
- DVS (ICD119 pin 30) = 60 Hz
- DHS (ICD119 pin 28) = 48 KHz
9. Check the signal input to the main PCB and the signal input to the connector (pin 31).
- Power On/Off (CN102B pin 23): High
- Ballast on/off (CN102B pin 24): High
- Lamp detection (CN102B pin 25): Low
- Fan Detection (CN102B pin 26): High
- Temp Detection (CN102B pin 27): High
Samsung Electronics
Troubleshooting
6-13