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--- blog:sony_vaio_f_seria [2025/01/28 16:39] – [Power Board Failure - AGAIN!] john
+++ blog:sony_vaio_f_seria [2025/01/28 17:11] (current) – [Table] john
@@ Line 93: / Line 93: @@
 Unfortunately, at this point in time I have no other sources of alternative power control boards, nor do I think it is worth the risk of replacing it only to have it possibly fail again after a short period of use.
-{{:blog:pentium:vaio:sonyvaio_fxxx_powerboard_lower.jpg?800|}}
+{{:blog:pentium:vaio:sonyvaio_fxxx_powerboard_lower.jpg?800|}} {{:blog:pentium:vaio:sonyvaio_fxxx_powerboard_upper.jpg?800|}}
+^ Part Number(s)           ^ Surface  ^ Quantity  ^ Pins  ^ Manufacturer       ^ Description                                              ^
+| 355A                     | Lower    | 2x        | 3     | ?                  | MOSFET                                                   |
+| A00B                     | Lower    | 1x        | 5     | ?                  | ?                                                        |
+| LT 1621                  | Lower    | 1x        | 16    | Linear Technology  | Rail-to-rail current sense amplifier                     |
+| LT 1435A                 | Lower    | 1x        | 16    | Linear Technology  | Synchronous step-down switching regulator controller     |
+| I?R 024H / 4U3E / f7413  | Lower    | 2x        | 8     | ?                  | ?                                                        |
+| A00B                     | Upper    | 2x        | 5     | ?                  | ?                                                        |
+| E2LD                     | Upper    | 1         | 5     | ?                  | ?                                                        |
+| 4925 / ?EUA / W048       | Upper    | 2         | 8     | ?                  | ?                                                        |
+| ?415A / T07BAN           | Upper    | 1         | 8     | ?                  | Power control transistor                                 |
+| ???                      | Upper    | 2         | 8     | ?                  | Tiny: 2.5-3mm wide. Almost impossible to read markings.  |
-^ Part Number(s) ^ Surface ^ Quantity ^ Description ^
-| 355A           | Lower   | 2x       | MOSFET      |
 **[Update - Jan 28th 2025]** I tried powering both laptops and all three power boards with a bench PSU, with voltages from 12-20V DC. No change in behaviour; the laptop acts as if there is no power applied and there is no visible power draw from the bench PSU. Unless someone figures out what component(s) fail on these power boards, any Sony Vaio Fxxx series laptop is running on borrowed time until it fails.
 **Therefore, I cannot recommend any of the Sony Vaio PCG-Fxxx models for retro computing use**, despite the really nice hardware specifications.