故障现象：COMPAQ E500屏暗

解决方法：造成这种问题通常是高压板、屏线、或屏上的
被光灯损坏而造成的。用替换法替换背光灯管发现故障依
% E" @& N; l7 I) _旧，考虑问题出在高压板上，经测量发现高压板上的一个
线圈脱焊将其重新焊接问题解决。

Draft – Pong Adds/Cohiba Power Up Sequence
  V6 ^6 B! M# _6 U: NCreated: 11/06/00
Created for Armstrong/Riata by: C. Massery
Edited for Pong Adds/Cohiba by: Ty Kingsmore
This document contains the power up sequence for the X00 rev of the Pong Adds/Cohiba platform.
There are two sections to this document. The first section lists notes for some of the signals listed in the waveform section. The
0 Z3 j4 ]2 L1 b) }second section shows a timing diagram of the power up sequence.
' n/ ^" ~  z2 K$ |; L0 D8 pBelow are the conventions that are followed for the timing diagrams:
- time scale for x-axis is milli-seconds
0 d( p! y$ p$ W9 ]5 `+ ^/ ]- edge to edge relations of signals are to scale
- signals that transition at the same time on the diagram occur within a relatively close time period
- invalid times are included for the rise time of voltage planes
  Y- z" a7 m: u( ^. x' a8 W- the timings are done based on a battery-boot situation.
" h5 h  U+ t8 r* h- The following configuration was used in taking the measurements:
- Pong Adds/Cohiba board 000E
8 ~0 U, G; i3 }- Sonny Q’s initial serial out’s BIOS
: i0 n$ C$ I& F- NO video card
- LT charger board
' t2 T( u- N9 k# o, c* k& l- 256 MB Samsung memory
- 933 CuT processor
Waveform Signal Information
References below are to X00 revision of the schematic. This includes signal names, page and reference designator references.
power_sw- source of this signal is JLED (p.35) or JDOCK (p.29)
" [: I4 I% q) ]' o8 R) v4 rpower_sw this signal is the output of the inverter U48, and the input to pin 2 of U80