Acer AL1914 Dead

[Tiny1000]

Re: Acer AL1914 Dead

Sorry to take so long getting back (been very busy) - I got the pair of IC109 SG6841SZ's back (thanks Bobdee) replaced them and the outcome was two working monitors - So big thanks to Bobdee for sourcing the part Plainbill for the time and using the grey matter (for suppling the brains) and Kc8adu for naming the faulty part. If this helps anybody else with the same problem plese drop a thank you for the time and effort these 3 put into this thread

[speedy1980]

Re: Acer AL1914 Dead

I have the same problem: Display is dead. The large capacitor has 310 V (Germany - 220 V). From the - lead of the large capacitor to R907 there are 100V. So there must be something wrong. Is there anyone with a hint for me?

[PlainBill]

Re: Acer AL1914 Dead

I have the same problem: Display is dead. The large capacitor has 310 V (Germany - 220 V). From the - lead of the large capacitor to R907 there are 100V. So there must be something wrong. Is there anyone with a hint for me?

Similar symptoms often have different causes. 100 volts could very well be correct. Does the other end of R907 have 310 volts on it?

Measure the output voltages from the power supply. There are failures on the 'logic card' that can give the appearance of 'no power'.

PlainBill

[speedy1980]

Re: Acer AL1914 Dead

On the one side of R907 there are around 100 V and on the other side around 4.4 V.

[PlainBill]

Re: Acer AL1914 Dead

On the one side of R907 there are around 100 V and on the other side around 4.4 V.

OK, on the SG6841SZ (the SMPS controller), what is the voltage from pin 1 (Gnd) to pin 3 (Vin). If it is also 4.4 volts, the SG6841SZ is defective.

PlainBill

[speedy1980]

Re: Acer AL1914 Dead

Pin 1 to pin 3: 4.4 V. So I will replace the SG6841SZ, thank you very much!

[offshwga]

Re: Acer AL1914 Dead

.....Dead no response from the front controls or LED - He changed C914 (1000uf) & C915 (1000uf) which got two of the monitors working ....

Just to say that this also worked for me, thanks to this forum for pointing me the right way . C914 and C915 are indicated in the following pic:


Hardest part was opening the case without damaging it. Undo the 4 screws on the back, pop off the bulge where the stand connects to the lcd and undo the 4 screws there. Then get something nice and thin to push in to the seam running around the edge of the lcd and the front pops off. There are 4 screws holding in the long narrow pcb with the front buttons and led on it. then it just comes straight out of the back plastic. There are 2 small screws holding on the metal cage around the electronics....

I am seriously thinking about taking off the plastics altogether, the monitor looks pretty good without any plastic except for the base

[speedy1980]

Re: Acer AL1914 Dead

For the archive: I replaced the SG6841SZ and it works! Thanks to this forum.

[PlainBill]

Re: Acer AL1914 Dead

For the archive: I replaced the SG6841SZ and it works! Thanks to this forum.

Told ja!!! Congratulations!

Not a good morning, 1 successful repair, 1 f***ed up repair and one that doesn't look promising.

PlainBill