LG PH30N - Trouble Shooting Guide

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Only training and service purposes.
TROUBLE SHOOTING GUIDE
- Cabling problem
1) Disassemble the machine and check whether FPC cable and wire are installed in place;
2) If it is conrmed that the connection is still poor after being installed in place, pls try to plug and insert the FPC cable, meanwhile,
the gold nger and socket can be cleaned to eliminate the poor contact caused by grease and other foreign material.
- No Picture
1) Disassemble the machine to check whether the drive plate and FPC cable are installed in place;
2) Remove the main board and drive board, and use a jig to verify whether the main board and drive board are normal;
3) Remove the engine, and use a jig to verify whether it is normal.
- Picture Unstable
1) Disassemble the machine to check whether the drive plate and FPC cable are installed in place;
2) Remove the main board and drive board, and use a jig to verify whether the main board and drive board are normal. If it is con-
rmed that the main board is abnormal and the picture is sometimes good or sometimes bad, try to replace the FPGA;
3) Remove the engine , and use a jig to verify whether it is normal.
- Power o󰀨 after power on
Check whether the battery capacity is insu󰀩cient;
1) Check whether the fan works normally;
2) tlDisassemble and check whether the thermal pad of PLDA 3000 is installed in place.
- No Power and No power on
Check whether the battery capacity is insu󰀩cient;
1) Remove the main board and drive board, and use a jig to verify whether the main board and drive board can work normally;
2) Remove the engine , and use a jig to verify whether it is normal.
- No sound output
1) Disassemble the machine and check whether SPK socket is connected in place;
2) Replace SPK
3) Visual check whether the audio circuit exists pseudo soldering or damage;
4) Judge the defective device by measuring the signal of audio circuit, then replace a new one.
- Out of focus
1) Replace a new engine
- etc