LCD TV: LG32LD330 A Repaired

[Ahakim]

TVC LCD
Model: LG32LD330 A
Dark screen, Very very dim blue light uniformly on all screen (almost nothing).
24VDC gets to Starting circuit(from smps). However no voltage to Inverter IC(Ref on Inverter IC: T28870.1b). Therefore no HV(high voltage) to CCFL(cold cathode fluorescent lamps), so no back light(which is the symptom indicated above).
CAUSE: SMD fuse F20 open(very small black rectangular rod). It is located on inverter board along with starting circuit. Replaced: Good work.
Measured on DC scale, current through the fuse in working condition: 39mA.

[budm]

Re: LCD TV: LG32LD330 A Repaired

Great work, another failed black fuse, very common in CMO inverter board.

[tom66]

Re: LCD TV: LG32LD330 A Repaired

Good work. Out of interest, what was the original fuse rating?

[Ahakim]

Re: LCD TV: LG32LD330 A Repaired

The fuse is an 8A/250V! Good question,TOM ! In fact I was wondering why the current/voltage rating is so high, While it is supposed to handle an average 40mA / 24VDC!!!

[budm]

Re: LCD TV: LG32LD330 A Repaired

" SMD fuse F20 open(very small black rectangular rod)" That is not 8A fuse.

[budm]

Re: LCD TV: LG32LD330 A Repaired

"SMD fuse F20 open(very small black rectangular rod)" that is not 8A fuse if it is black with '20' printed on similar to this one.