LG OM7550 - Page 33

3-12
ONE POINT REPAIR GUIDE
NO BOOTING IN CD/USB FUNCTION
After you turn on power key and displayed message in the following order (HELLO  VOL XX 
CD or USB) on VFD, it will not display other message on VFD, and it will not boot-up normally.
8-4. SDRAM (IC502)
8-4-1. Solution
Please check and replace IC502 on MAIN board.
8-4-2. How to troubleshoot (Countermeasure)
1) Check below waveform & soldering status of SDRAM (IC502) on MAIN board.
 If pin17(#CAS), pin18(#RAS), pin19(#CS), pin38(CLK), pin29(address), pin2(DQ) doesn’t come out,
check damping resistor (R568, R570, R544, R547).
2) If resistor is OK, then replace IC502(SDRAM).
3) After change IC502, if It is still not below waveform, Check IC501 (DSP IC).
8-4-3. Service hint (Any picture / Remark)
V
V CC
Reset
address
data
/
/ CS
R AS
/ WE
CAS
< Signal waveform >
< MAIN board bottom view >
IC502
IC502