On Sun, Jul 8, 2018 at 4:08 PM, Jeffrey Birt <[email protected]> wrote: > Cleaning the flux off will not fix anything in itself (in most cases) it > just lets you see the solder joints in that area better. If it were me I > would look at the schematic and see which driver ships control that section > of the screen and give all those joints a good once over. > > Jeff
Cleaning sometimes fixes issues if the flux is causing a mild short (some flux is conductive). But, I agree, it's time to reflow those joints (probably with more flux, ironically). Also continuity tests to the bus would be a good idea. (opens up service manual) Working from the clue that it's only the bottom half of the screen. M508 (an HD61103 IC) controls the lower half of the screen, so that's a good starting place. It should be connected to three of the segment driver ICs (HD61100). The VRAM (M16) is probably fine since it's shared. T33, VR2, R136 and R137 are all indicated in the service manual as suspects. -Josh
