Sony KZ-32TS1U Training Manual page 63

Plasma tv & grand wega projection tv

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Table 27-1 - How the Main Micro Determines if the Lamp or Circuitry is Bad

Condition

Normal

Lamp LED blinks Continuously (HV OK.

Lamp bad)

Standby LED blinks 5 times (No HV,

Power Block, PS fuses, or M board bad)

Defect – The Standby LED blinks five times – At power ON when the Power block is instructed to turn ON (HIGH

@ white wire to Power Block / CN1908/pin 1), but no current is drawn (HIGH at end gray wire / CN1908/pin 3),

the lamp or the Power Block is defective. To determine which is defective, the antenna signal (explained in the

last paragraph) is used by the Main Micro only when the PRT line (CN1908/pin 3) remains HIGH (no lamp

current).

During this defect, PRT = HIGH forces the Main Micro IC9004 to request information about the presence of HV

via serial data from Lamp Control IC1952. If RF (HV) is not detected, the Main Micro keeps the audio and video

muted, blinks the Standby LED blink five times and shuts down the TV in three minutes.

HV antenna positioning

After repairs, reposition the black HV antenna near one of the HV leads as shown in Figure 27-2. If it is not

positioned as shown, the LAMP LED will NOT flash during a lamp defect.

ANT

WIRE

PRT (Protect)

CN1908/pin 3

Low (0Vdc)

High (5Vdc)

FIGURE 27-2 - HV ANTENNA POSITION

27. Grand Wega Lamp Control

Visual Arcing at G1/ RF at CN1908/pin 12

None

Yes at power ON and repeats every 5

seconds later until TV shutdown (3 mins.).

None

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Troubleshooting

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