the power supply is also more complicated

The fireball board LM Series LM, KA, KX models, LM chip high heat, high operating voltage, the power supply is also more complicated. The chip designs Personally, I think it can be considered, although there will be burned, but have not Philips fast bad. The board is a good design, bad driver chip, the next element will suffer! ! ! ! Driver chip is bad, then, will produce other components burned out, it bad break components: three 22-ohm resistor also bad, but the resistance is broken, it is difficult to find a replacement under the parallel resistance 6.7 Europe available a 1/8W resistor replacement draw three resistors in parallel, the coil will easily rotten, hard time finding a replacement can be replaced by two inductors LE board.

: LED light, the main chip bad.

: On chips to play disc, head control chip is broken or power supply bad the transformer dual triode breakdown.

: Disk turn indicator lights out, bad for the cache.

Four: the light is not on, the board supply voltage: 12V, 3.3V, 8V, driver chips bad whether, crystal, head control chip short circuit, the main chip bad.

: Indicator light, does not turn bad driver chips, the main chip poor contact or bad.

Six: light Friday, cache poor contact or bad cache, the main chip poor contact or bad.

Seven: everything is normal, including the sound of the hard disk seek normal motherboard can not find the disk-based chip bad. (Note that the main chip resistance leading to the IDE port is damaged.)

 

The fireball AS circuit board repair

Fireball intraday 7200, 2M cache, there are two: one for the AS series, another for LM, KA, KX Series. Drive chips are ST. Different models, not substitution. Latter board relative to the former good repair.

AS the plate in the 7200 state, the heavy workload of the driver chips, heat, high operating voltage supply of the AS board also complex.

Driver chip failure caused by: do not turn, does not shine, idling, playing disc.

Since the circuit board than LCT series of thick, small. Generally does not appear Weld phenomenon, caused by the failure: flash, seek not fully hit the disk does not shine, does not recognize disk, admit parameters, turn after turn off the lights.

A common problem of the the fireball AS board is the driver chip next to the transistor burned out, and the change will burn, it is difficult to find the substitution triode.

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