NEC Multisync 1830 XtraView - Dead inverter

[Zir]

Re: NEC Multisync 1830 XtraView - Dead inverter

Both transformers showed equal amplitudes when measured with the scope, so I can't get it why one would have shorted turn(s)?

[Wizard]

Re: NEC Multisync 1830 XtraView - Dead inverter

not probed on.

I held probe body against the transformer at .1V/div.

Cheers, Wizard

[kaba]

Re: NEC Multisync 1830 XtraView - Dead inverter

ok guys,
never had a blown transformer on these inverterboards.
so stop fumbling around and check this when your solderskills and tools are appropriate:

1. 4 smd-type resistors r11-r14 in one row with 271 printed on them:
solderpoints most commonly weak, resolder and test unit, most times your ok now otherwise go on:

2. check smd-type fuse f1 located between connector cn1 and capacitor c1: replace if broken. (3amp ff-type) do not test unit until:

3. test q8 and q9 ok, you should know how to do it. replace if broken. (fmmt619 or equal) and test unit. should be fine now.

if inverter still fails to work you most probably killed it yourself during repair attempts not following the three steps above and/or lack of appropriate solderskills and tools.

that´s it.

sorry for joining that late

kaba

[Ted Pluta]

Re: NEC Multisync 1830 XtraView - Dead inverter

Did a quick look about and found this schematic. Perhaps it can help?

Schematics from NEC LCD1830 inverter: ALPS UHP061104

Toast

There are only a few part numbers and values on this reverse engineered drawing. Does any one know the fuse current rating of F1?