diff --git a/src/mame/drivers/lasso.c b/src/mame/drivers/lasso.c
index 8399d1a713a..1bcef453d49 100644
--- a/src/mame/drivers/lasso.c
+++ b/src/mame/drivers/lasso.c
@@ -19,7 +19,6 @@ Notes:
   same as the Rock-Ola games of the same area.  Lot of similarities between
   these hardware.  The music ends at the perfect time with this clock speed
 - Lasso: fire button auto-repeats on high score entry screen (real behavior?)
-- Pinbo: background color is wrong (MT #4546)
 
 ***************************************************************************
 
@@ -182,6 +181,7 @@ static ADDRESS_MAP_START( pinbo_main_map, AS_PROGRAM, 8 )
 	AM_RANGE(0x0800, 0x0bff) AM_RAM_WRITE(lasso_colorram_w) AM_BASE_MEMBER(lasso_state, m_colorram)
 	AM_RANGE(0x1000, 0x10ff) AM_RAM AM_BASE_SIZE_MEMBER(lasso_state, m_spriteram, m_spriteram_size)
 	AM_RANGE(0x1800, 0x1800) AM_WRITE(pinbo_sound_command_w)
+	AM_RANGE(0x1801, 0x1801) AM_WRITEONLY AM_BASE_MEMBER(lasso_state, m_back_color)
 	AM_RANGE(0x1802, 0x1802) AM_WRITE(pinbo_video_control_w)
 	AM_RANGE(0x1804, 0x1804) AM_READ_PORT("1804")
 	AM_RANGE(0x1805, 0x1805) AM_READ_PORT("1805")
@@ -603,11 +603,10 @@ static MACHINE_CONFIG_DERIVED( pinbo, base )
 	/* video hardware */
 	MCFG_GFXDECODE(pinbo)
 	MCFG_PALETTE_LENGTH(256)
-
 	MCFG_PALETTE_INIT(RRRR_GGGG_BBBB)
 	MCFG_VIDEO_START(pinbo)
 	MCFG_SCREEN_MODIFY("screen")
-	MCFG_SCREEN_UPDATE(pinbo)
+	MCFG_SCREEN_UPDATE(chameleo)
 
 	/* sound hardware */
 	MCFG_DEVICE_REMOVE("sn76489.1")
diff --git a/src/mame/includes/lasso.h b/src/mame/includes/lasso.h
index 1cd08df1cd7..8f3a6252ce5 100644
--- a/src/mame/includes/lasso.h
+++ b/src/mame/includes/lasso.h
@@ -53,4 +53,3 @@ VIDEO_START( pinbo );
 SCREEN_UPDATE( lasso );
 SCREEN_UPDATE( chameleo );
 SCREEN_UPDATE( wwjgtin );
-SCREEN_UPDATE( pinbo );
diff --git a/src/mame/video/lasso.c b/src/mame/video/lasso.c
index ecad434771b..18ece201569 100644
--- a/src/mame/video/lasso.c
+++ b/src/mame/video/lasso.c
@@ -190,6 +190,8 @@ VIDEO_START( pinbo )
 
 	/* create tilemap */
 	state->m_bg_tilemap = tilemap_create(machine, pinbo_get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
+
+	tilemap_set_transparent_pen(state->m_bg_tilemap, 0);
 }
 
 
@@ -410,13 +412,3 @@ SCREEN_UPDATE( wwjgtin )
 
 	return 0;
 }
-
-
-SCREEN_UPDATE( pinbo )
-{
-	lasso_state *state = screen->machine().driver_data<lasso_state>();
-	tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
-	draw_sprites(screen->machine(), bitmap, cliprect, 0);
-
-	return 0;
-}