Digital Board Section - Panasonic KX-FHD332C Service Manual

6.6.7. DIGITAL BOARD SECTION

When the unit fails to boot up the system, take the troubleshooting procedures very carefully. It
may have a serious problem.
The symptom: No response when the power is turned on. (No LCD display, and keys are not
accepted.)
The first step is to check the power source. If there is no problem with the power supply unit,
the problem may lie in the digital unit (main board).
As there are many potential causes in this case (ASIC, DRAM, etc.), it may be difficult to specify
what you should check first. If a mistake is made in the order of checks, a normal part may be
determined faulty, wasting both time and money.
Although the tendency is to regard the problem as a serious one (IC malfunction, etc.), usually
most cases are caused by solder faults (poor contact due to a tunnel in the solder, signal short
circuit due to solder waste).
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