Read Sharp LC-30HV4E (serv.man46) Technical Bulletin online
LCD 2005 05 03
Date of Issue: 12
th
May 2005
Classification:
White
LCD TELEVISION TECHNICAL BULLETIN
Page 1 of 1
Sharp Electronics (UK) Limited
Reference - MB 11 05 2005 - 1
Revision - 1
White – Carry out as required
Yellow – Carry out as required and whenever the unit comes in for service
Red – Carry out on all units
MODELS
All
SYMPTOM
D
ead or stuck in standby.
All Sharp LCD TV sets have a Lamp Error detection circuit which will return the LCD
TV to stand-by if a fault is detected, the fault is logged by the lamp error counter which
will render the LCD TV inoperative if it the error count reaches 5.
TV to stand-by if a fault is detected, the fault is logged by the lamp error counter which
will render the LCD TV inoperative if it the error count reaches 5.
To enable fault finding the lamp error detection circuit is ignored when service mode is
activated. Service mode activation is detailed in the relevant service manual.
activated. Service mode activation is detailed in the relevant service manual.
After the fault has been diagnosed and repaired the lamp error counter must be reset
to “0” before normal functionality is restored, again this is detailed in the relevant
service manual.
to “0” before normal functionality is restored, again this is detailed in the relevant
service manual.
CAUSE
Possible causes of this symptom are:
•
Inverter circuit failure (switching transistors)
•
Lamp failure (no or low output)
•
Poor or loose connectors, fuse holders (lamps or inverter board).
•
Dry joints (power supply or inverter board).
•
Trapped or chaffed cables to lamps.
•
Power feed to lamp inverter circuit.
•
Fault in error detection circuit
ACTION
Repair the unit as necessary and reset the lamp counter.
