Repairing a FujitsuSiemens LSL3230T

[DMCrimson]

Re: Repairing a FujitsuSiemens LSL3230T

Time to bring this up again Today I finally had time to put this thing back together - and as you might guess... It's not powering on - those 5V lines that go to the driver board have only ~2V and the transformer in the middle of the PSU board makes some ticking noise -faulty?

[DMCrimson]

Re: Repairing a FujitsuSiemens LSL3230T

Found suitable connector from some oldish 4:3 BenQ-tft - although it's a bit too wide, being 12-pole instead of 10-pole, so I'll need to cut it a bit...

[DMCrimson]

Re: Repairing a FujitsuSiemens LSL3230T

Well, took a bit time, but the grounds line up on controller board the same way as on power supply - so do 5V's. Now I just need proper connector housing...

[Scenic]

Re: Repairing a FujitsuSiemens LSL3230T

Having the crimped connectors loosely sitting in there would make it ridiculously easy to short out. I highly doubt it came like that from the factory.

If you're lucky, the backside of the controller board might have some indications as to which pin is what (like the PSU board above the connector in the pic in post #1)

[DMCrimson]

Re: Repairing a FujitsuSiemens LSL3230T

He sais he'd opened it, but when I asked about the said connector he had no recollection there being a connector - but then again, I'll be measuring stuff tonight

[Scenic]

Re: Repairing a FujitsuSiemens LSL3230T

to continue problem #1: the cable shown attached to the PSU board has no connector on other end, just bare crimped ends - are these connected to the driver board in the same order as they are on the PSU?

Sounds like the previous owner has some explaining to do. He probably ripped the crimped connectors out of the plastic part of the plug and lost the plastic part (i.e. he's been in there before, most likely not telling you about it)

[DMCrimson]

Re: Repairing a FujitsuSiemens LSL3230T

Thanks for the pointers - need to fire that multimeter up later tonight

[PlainBill]

Re: Repairing a FujitsuSiemens LSL3230T

to continue problem #1: the cable shown attached to the PSU board has no connector on other end, just bare crimped ends - are these connected to the driver board in the same order as they are on the PSU?

Usually. There are things you can do to make sure. One major one is to check that all ground pins match. Another is to make sure 5V pins match.

PlainBill

[DMCrimson]

Re: Repairing a FujitsuSiemens LSL3230T

to continue problem #1: the cable shown attached to the PSU board has no connector on other end, just bare crimped ends - are these connected to the driver board in the same order as they are on the PSU?

[retiredcaps]

Re: Repairing a FujitsuSiemens LSL3230T

U101 on the driver PCB has markings 1084-33 0825FL - from what google tells me that's a 5A low-dropout regulator, 3.3V - is that right?

Yes.

[DMCrimson]

Victim/patient in question is a 23" FullHD display sporting a LG-Philips LM230WF1-TLA1 panel, dual HDMI and one VGA input. The previous owner simply said there's no picture, which leads to CCFL-problems first.

Interestingly, the power supply board is the same as used on Hannspree HF237HPB - and has faulty caps (SamXon - bulged, Lelon, Su'scon) - for which I've already purchased replacements (Hitano EXR) and intend to replace as soon as I can get my troubles with Weller sorted out...
Here are the questions though:

1. The PSU is mounted face down, so that the leads on the left side go to the driver PCB, but the previous owner had removed them - are they 1-on-1?
2. U101 on the driver PCB has markings 1084-33 0825FL - from what google tells me that's a 5A low-dropout regulator, 3.3V - is that right?
3. Is that driver PCB used elsewhere? The board in question is ILIF-114.