Kenwood TK-5810 Service Manual

Also see for FleetSync TK-5810(H): Instruction manual Specifications Service manual Instruction manual

TK-5810 (BG) /5810H (BG)54TROUBLE SHOOTINGFault diagnosis of the BGA (Ball Grid Array) IC■ OverviewA flowchart for determining whether or not the transceiver can be powered on (the LCD does not function even if the powerswitch is turned on) due to broken BGA parts.■ BGA partsASIC (IC708), DSP (IC701), FLASH (IC700), SRAM (IC703)● Checking power supply voltageChecking voltagePoints to be checked Normal voltage33M IC2 (5 pin) 3.3V15M IC8 (5 pin) 1.5V33A IC7 (5 pin) 3.3V33BU Q7 (Collector) 3.3VPower supply of each device is connected through the ferrite bead.[ASIC]33M: L708, 15M: L709[DSP]33M: L702, 15M: L701[FLASH]33M: L700[SRAM]33BU: L703● Checking the clockChecking the clockPoints to be checked Normal voltage (3.3V)18.432MHz ASIC side R764 18.432MHzDSP side R713 18.432MHz32.768kHz IC704 (1 pin) 32.768kHzWhen a normalvalue is confirmed.When a normalvalue is confirmed.● Checking the Reset/Control signalChecking the control signal input to the ASICPoints to be checked Normal voltageRESET IC705 (4 pin) 3.3V/BINT IC1 (1 pin) 3.3V/OVRB D3 (Cathode side) 3.3VChecking the ASIC input switch signal*Each signal is not masked by the setting of the FPU.The POWER key is pressed and held.Points to be checked Confirmed voltage/PSW Q201 (Drain) 0VThe ignition key is kept ON.Points to be checked Confirmed voltage/IGN (R825) 0VPoints to be checked Normal voltage/FRST TP991 3.3VIf the /FRST is always 0V, the ASIC is broken.If the /FRST repeats 3.3V and 0V at intervals,the ASIC, FLASH and SRAM may be broken.The BGA parts are not broken.Checking for an abnormal point33M has an abnormal voltage.[ASIC]Remove L708 to check the voltage of the 33M.If the voltage becomes normal, the ASIC is broken.[DSP]Remove L702 to check the voltage of the 33M.If the voltage becomes normal, the DSP is broken.[FLASH]Remove L700 to check the voltage of the 33M.If the voltage becomes normal, the FLASH is broken.15M has an abnormal voltage.[ASIC]Remove L709 to check the voltage of the 15M.If the voltage becomes normal, the ASIC is broken.[DSP]Remove L701 to check the voltage of the 15M.If the voltage becomes normal, the DSP is broken.33A has an abnormal voltage.[ASIC]Exchange IC7 (33A Regulator) to check the voltageof the 33A.If the voltage becomes normal, the ASICis broken.33BU has an abnormal voltage.[SRAM]Remove L703 to check the voltage of the 33BU.If the voltage becomes normal, the SRAM is broken.If the voltage is not corrected, there is a problemother than the BGA parts.Remove the R764 and R713. If it oscillates normally,the DSP and ASIC may be broken.Exchange IC704 (RTC).If it oscillates normally,the ASIC may be broken.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.