Table Of Contents - HP R15AAC Service Manual

1) Power Board Operation Therory
1. Therory of Power Board Operation ----------------------------------------------------------------------------------------- 4
2) Inverter Circuit
2. Inverter Circuit ----------------------------------------------------------------------------------------------------------------- 5
3) Interface Operation
3.1 Top --------------------------------------------------------------------------------------------------------------------------- 6
3.2 Power ------------------------------------------------------------------------------------------------------------------------ 6
3.3 VGA & DDC interface ----------------------------------------------------------------------------------------------------- 6
3.4 Scaler GM5321 ------------------------------------------------------------------------------------------------------------- 7
3.5 Key & Panel interface ----------------------------------------------------------------------------------------------------- 8
3.6 Audio ------------------------------------------------------------------------------------------------------------------------ 9
3.7 Others --------------------------------------------------------------------------------------------------------------------- 10
3.7.1 Detection of POWER switch status -------------------------------------------------------------------------------- 10
3.7.2 Display mode identification ------------------------------------------------------------------------------------------ 10
3.7.3 List of I/O Pin Assignments of the I311 ---------------------------------------------------------------------------- 12
4) Trouble Shooting
1. For Power Board ------------------------------------------------------------------------------------------------------------- 13
2. For Inverter Board ----------------------------------------------------------------------------------------------------------- 14
3. No display of screen (Screen is black, color of LED is amber) -------------------------------------------------------- 15
4. Nothing displays on screen (Screen is black, color of LED is green) ------------------------------------------------ 16
5. Checking the back light unit ----------------------------------------------------------------------------------------------- 18
6. Abnormal screen ------------------------------------------------------------------------------------------------------------- 19
6.1 Abnormal screen for VGA source ------------------------------------------------------------------------------------- 19
7. Abnormal OSM display adjust problem ---------------------------------------------------------------------------------- 20
8. Abnormal plug and play operation --------------------------------------------------------------------------------------- 21
8.1 Abnormal plug and play operation for VGA ------------------------------------------------------------------------- 21
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R15AAC/AAU (vs15)