LAMP ERROR [LAMP LED]
Lamp LED Flashing: In most cases, a flashing Lamp LED indicates a defective Lamp, and the Lamp must be replaced. However an open circuit in the hi-voltage cabling to the lamp will also cause this failure indication. Therefore, before replacing the lamp confirm that the cabling and connections are good between the lamp drive board and lamp.
TEMPERATURE ERROR [2 Flashes of Standby/Power LED]
The TV first displays an error message before shutting down and activating the 2X flash pattern. The error message dialogue box is displayed approximately 1.5 minutes and then the TV will shut down. The dialog give the owner the opportunity to set the TV to "High Altitude Mode" which will increase the fan speed.
The main objective when a 2X flash pattern occurs is to determine, which of the following possible defects are causing the excessive temperature condition.
- Excessively ambient room temperature in the local area of the TV.
- Dust or objects blocking the ventilation areas on the TV.
- Excessive lamp operating temperature.
- Defective LM75 temperature detection IC.
The first step is to check for proper ventilation and correct any abnormalities that will cause the TV to operate at high internal temperatures.
Check the following items:
- The TV should not be located too close to any heating elements.
- The TV should be at least 4 inches from all walls and enclosures to ensure adequate ventilation.
- Chuck the vented areas on the lower rear back cover and the two rear exhaust fan's are clear of all dust and debris.
If all ventilation areas and fans are clear and the TV still shuts down [2X] then the next step is to determine if one of the LM75 temperature detection ICs on S1, S2 or C boards have failed. It is a process of elimination to determine which LM75 has failure.
Substitute new or known good boards in the following order
- S1-Board.
- S2-Board. [The S-2 board is mounted in difficult-to-get-to spot. Therefor, the best way to substitute for the board, with very little dis assembly, is to have an extra wire harness (Between S-Board and Main Wire Harness) to connect the substitute board at the interconnect jack.
- Optical Block (C-Board)
If the TV still shuts down (2X) after the previous substitutions, then there is a problem with the 'DE' microprocessor, consequently, the ASU/DSU assembly must be replaced.
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S1 BOARD > A-1123-098-A
S2 BOARD > A-1123-099-A
Optical block:
50" > A-1148-155-A
60" > A-1127-174-A
ASU/DSU Assembly:
50" > A-1152-715-A
60" > A-1152-714-A
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