This one is personal. I have a spot reserved for it on my desk.
The patient is a Memorex MLT1912 19" Widescreen LCD HDTV. I purchased it as 'dead', and boy, was the seller right. The main problem appears to be a shorted IC, U11 on the 'TL ATSC LCD version 5' board. Pictures are attached. The first is of that area of the circuit board, the second is of the actual IC (2 legs were lost in removing it), the last is a drawing of the IC with a notch to identify pin 1.
For reference, the IC is 3 mm long. It is a smd device and appears to bear the designation A17d. I am certain about the A17, the d is my best guess. I am confident it is a voltage regulator. After much probing I have identified the following pins.
1 Control? (CN3-4 via 4.7K R87)
2 Ground
3 Power out
4 Power in
5 Feedback?
All attempts to identify a 5 pin voltage regulator with A17 in it's part number have failed; I have not found any smd IDs starting with A17 that match this package. I am searching for a schematic (yes, I'll pay for it), and have contacted Memorex for assistance. Neither have responded yet.
I'm pretty good at reading schematics, and analyzing how circuits work. I am LOST when trying to research available ICs for a particular purpose. And I'm confident that I haven't found all possible cross references for smd label to manufacturer's part number. Does anyone have any suggestions?
Thanks,
PlainBill
The patient is a Memorex MLT1912 19" Widescreen LCD HDTV. I purchased it as 'dead', and boy, was the seller right. The main problem appears to be a shorted IC, U11 on the 'TL ATSC LCD version 5' board. Pictures are attached. The first is of that area of the circuit board, the second is of the actual IC (2 legs were lost in removing it), the last is a drawing of the IC with a notch to identify pin 1.
For reference, the IC is 3 mm long. It is a smd device and appears to bear the designation A17d. I am certain about the A17, the d is my best guess. I am confident it is a voltage regulator. After much probing I have identified the following pins.
1 Control? (CN3-4 via 4.7K R87)
2 Ground
3 Power out
4 Power in
5 Feedback?
All attempts to identify a 5 pin voltage regulator with A17 in it's part number have failed; I have not found any smd IDs starting with A17 that match this package. I am searching for a schematic (yes, I'll pay for it), and have contacted Memorex for assistance. Neither have responded yet.
I'm pretty good at reading schematics, and analyzing how circuits work. I am LOST when trying to research available ICs for a particular purpose. And I'm confident that I haven't found all possible cross references for smd label to manufacturer's part number. Does anyone have any suggestions?
Thanks,
PlainBill
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