I'm a noobie who has been successful in fixing a few LCD's with standard through-hole components, but this 1704FP LCD has quite a few SMD's, something I had not tinkered with before. It all started with a no power indication. Opened up the case and found power supply components to be ok, resoldered in places that looked marginal, and replaced the shorted four FET's in the top-side of the inverter section. Powering up the board by itself, I got the following voltages at the output diodes (mounted on heat sinks): 5.3v, 12.7v, and 20.0v. At the connector P802 with the wires that connects the main board: pins 1-3, 5.3v; 4-7, 0v (grd), 8-10, 0v. With such encouraging results, I reconnected everything and repowered to get the power led to light up and for a few seconds show the OSB on the screen. By examining of the underside of the board where the SMD's are found, resistors are easy to identify but condensers are not marked. I was also able to read the markings on the following three SMD components which I don't have details for:
On the inverter side of the board,
I801: SG6841SZ, KMA233305490g
On the power supply side,
I101: OZ9930g, S1090122T, 0S46A
Q804: 13N06L
Markings on the Power-Inverter board: 6832151100-02, PTB-1511, 8/19/05.
Without a schematic and very little information on this model, it's hard to make much progress. The problem still seems to be in the inverter. Another burning question: are SMD components fairly easy to get and remove/install? Your insights and help to resolve this problem will be
much appreciated. Thank you.
On the inverter side of the board,
I801: SG6841SZ, KMA233305490g
On the power supply side,
I101: OZ9930g, S1090122T, 0S46A
Q804: 13N06L
Markings on the Power-Inverter board: 6832151100-02, PTB-1511, 8/19/05.
Without a schematic and very little information on this model, it's hard to make much progress. The problem still seems to be in the inverter. Another burning question: are SMD components fairly easy to get and remove/install? Your insights and help to resolve this problem will be
much appreciated. Thank you.
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