Troubleshooting For Remote Control - RCA 50LB45RQ Service Manual

Keys are sunken
• Check the screws that fasten the keyboard to the cabinet. They may be lost or getting loose.
• The key set may be bad, change them.
There is a reacting delay when operating the keys
o That is usually caused by bad keyboard, change it for a try.
Functions of keys are out of order
o Check the keyboard to see whether there is a short circuit between each soldering joint.
• Check all the resistances on PCB board.
o If a key is supposed to be able to achieve more than one functions, but it can achieve not all of them, that is usually
caused by wrong software. Please update the latest and correct software for a try.
• If you can't ensure where the problem comes from, change the keyboard for a try. If that still can't help, refer to chapter 5
for more details and resolution ways.
4.5 Troubleshooting for Remote Control
Note: If the troubleshooting can not help, please change the RC board. If that still can't solve the problem, please refer to
chapter 5 for more details and resolution ways with a will to mainboard repairing.
The RC (remote control, the same below) does not work
• Check the wire between mainboard and RC board, watch if there is fracture or cladding material breakage.
• Check the joint of mainboard and RC board wire, watch if there is poor soldering or fake solder. Also, the short circuit
can lead to this problem, too.
o Check the infrared senser that locates on the keyboard PCB. Watch if it is wrong or broken. Also, the poor soldering of
fake solder should be concerned and checked carefully.
• Check the other components of RC board are wrong or bad.
The LCD displays light in wrong color
• The short circuit is the most probable causation factor of this proble. Check the wire and joints for a judgement.
• Check the cable that links mainboard and RC board, watch if it is inserted with wrong location(similar with left-right channel
wire fault for audio).
o Check the LCD assembling, watch if its pins are in wrong location.
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