Game Boy Pocket with a dead column: when the ribbon is not the problem

Why the Pocket behaves differently

On a DMG, pressing the ribbon usually makes the line flicker because the bond has partially separated but still has patches of contact. On an MGB-001 the bond is more brittle and fails cleanly, so you get one dead column with no response to pressure at all.

Confirm it is a column and not a row. Rows fail too, but far less often, and a row fault usually points at the row driver rather than the bond. Count the dead line against a full-screen pattern and compare with a second console if you have one.

Before you touch the ribbon

Check the two things that imitate a dead column and cost nothing to rule out. The first is the LCD bias supply: a bias rail that has drifted will dim whole regions rather than kill a single column, but a marginal rail combined with a marginal bond looks exactly like a dead column on a cold console.

The second is the ribbon connector on the main board. On the Pocket the ribbon terminates in a press connector rather than being soldered, and that connector can work loose after a drop.

1. Run a full-screen pattern and count the dead line. Photograph the screen with the shell still on.
2. Check the ribbon connector on the main board. Reseat it and re-test before doing anything else.
3. Measure the LCD bias rail at the test point. A rail outside its specified range will dim the display unevenly.
4. Inspect the ribbon-to-glass bond at 10x under side lighting. On the Pocket a failed bond shows as a clean bright gap with no partial contact.
5. Compare against the row count. If the dead line is horizontal, this is a different fault and the reflow procedure below does not apply.

Reflow, or replace and be honest

The reflow on a Pocket needs less heat than a DMG but more care, because the polariser is closer to the bond and the glass is thinner. Work at 175 to 185 °C with a silicone-covered flat tip, one short pass, then test. Two passes maximum. Past that you are more likely to damage the polariser than to restore the bond.

Set expectations with the owner before you start. On this model the honest success rate is about one in two, and a failed attempt can leave the screen with a permanent brown mark where the heat went in. If the console is otherwise clean and the owner would rather not risk the screen, a replacement LCD module is the better answer.

1. Reseat the ribbon connector and re-test. If the column returns, stop here.
2. Set the iron to 180 °C with a silicone-covered flat tip.
3. Support the LCD from behind and make one slow pass along the bond line at the dead column.
4. Power up and check. If there is no change, make a second pass only.
5. If there is still no change, stop and discuss a replacement screen with the owner rather than adding heat.
6. After a successful reflow, run the console for an hour before returning it, and tell the owner the repair may not be permanent.