Strong SRT4155Evolution, Service Manual, Page: 10 / 32

4-3-1. Check STI5518 Clock.
27Mhz
?
Check point : U301 Pin 120 or R310
or R309.
81Mhz
?
Check point : U301 Pin 118 or TP301
120 MHz
?
Check point : U402 Pin 38
Failure Causes and Solution.
If the 27Mhz is acting unstably, Check the SCO and U402(SDRAM) and U301(STI5518) is damaged or not.
If you are firm belief of damage for the device, then replace the device.
If the clock 81Mhz on TP301, 120Mhz on Pin-38 of U402 is not generated from inside of the chip, Please check
the soldering state of U301.