PHILIPS 15PF9936
Service Manual

Service Modes, Error Messages, and Repair Tips
5.5.2 General Problems � TV switched �off� or changed channel without any user action Set switches off after �TV SWITCHING OFF� was displayed. �Auto Standby� switched the set �off� because: � There was no ident signal for more than 15 minutes. � There was no remote control signal received or local key pressed for > 2 hours. See chapter 8 for a description on the options to enable/disable �Auto Standby�. 5.5.3 Picture problems Picture too dark or too bright � Press �Smart Picture� button on the remote control. In case the picture improves, increase / decrease the brightness value or increase / decrease the contrast value. The new �Personal Preference� value is automatically stored after 3 minutes. � After switching on the Customer Service Mode the picture is OK. Increase / decrease the brightness value or increase / decrease the contrast value. The new �Personal Preference� value is automatically stored after 3 minutes. Snowy picture Check the �NOT TUNED� section of the Customer Service Mode screen. Snowy picture and/or unstable picture A scrambled or decoded signal is received. Black and white picture � Press �Smart Picture� button on the remote control. In case picture improves, increase the colour value. The new �Personal Preference� value is automatically stored after 3 minutes. � After switching on the Customer Service Mode the picture is OK. Increase the colour value. The new �Personal Preference� value is automatically stored after 3 minutes. Menu text not sharp enough � Press �Smart Picture� button on the remote control. In case the picture improves, decrease the contrast value. The new �Personal Preference� value is automatically stored after 3 minutes. � After switching on the Customer Service Mode the picture is OK. Decrease the contrast value. The new �Personal Preference� value is automatically stored after 3 minutes. 5.5.4 Sound problems No sound or sound too loud (after channel change / switching on) After switching on the Customer Service Mode the volume is OK. Increase / decrease the volume level. The new �Personal Preference� value is automatically stored after 3 minutes. 5.5.5 Extra information/tips: � Complaints that may be caused by an incorrect system setting: � No colours � Colours not correct � Unstable picture � Noise in picture To change the system setting of a preset: 1. Press the �MENU� button on the remote control 2. Select the INSTALL sub menu 3. Select the MANUAL STORE sub menu 4. Select and change the SYSTEM setting until picture and sound are correct

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5. Select the STORE menu item When the set is in PC mode and there is no VGA signal present at PC-in connector, the set will shutdown to standby in couple of seconds after showing �NO VIDEO INPUT�. This is a normal behaviour of the set to safe power. The Scaler is the driving engine of the LCD panel. When there is no display and OSD on screen, check whether sound is producible on TV channel. If sound is audible, most likely the defective lies in Scaler board or inverter board. To know fast whether inverter is functioning, visually check if the backlights are �on� by looking at the back of the LCD panel. Some bright spots can be seen on the side. Other way to tell whether the backlight is working is to switch the set to AV mode. The front of the screen had some kind of �fogged� effect. Note: when one of the backlight connectors has loosened, the inverter circuit will be shut down. If the supply to the LCD panel is OK (likewise for backlight supply), but no data signals (example: signals on connector 1506) supplied from Scaler to LCD panel, you will notice that the LCD screen will shown full screen in sequential of BLUE, GREEN, RED, BLANK, dark-GREY, light-GREY and WHITE repeatedly. It means LCD panel is in good condition. The fault lies in the Scaler board

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