Toshiba 65H82 65" Rear Projection Television

CIRCUIT CHECKS

HIGH VOLTAGE CHECK

CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below.

1. Connect an accurate high voltage meter to the anode of the picture tube.

2. Turn on the receiver. Set the BRIGHTNESS and CON-

TRAST to minimum (zero beam current).

3. High voltage must be measured below (B) kV.

Refer to table-1 for high voltage (B).

(See SETTING & ADJUSTING DATA on page 19)

4. Vary the BRIGHTNESS to both extremes to be sure the high voltage does not exceed the limit under any conditions.

CAUTION:

When the following parts fail, check the High Voltage after replacing.

Location

No.

T461

C407

C408

C441

C432

C433

Name

Flyback

Capacitor

Capacitor

Capacitor

Capacitor

Capacitor

Descriptions

50", 65"

TFB3092AD

4700pF,

±3%

8200pF, ±5%

4700pF, ±3%

8200pF, ±5%

1200pF, ±3%

FS CIRCUIT CHECK

The Fail Safe (FS) circuit check is indispensable for the final check in servicing. Checking should be done following the steps below.

1. Turn the receiver on.

2. Temporarily short TP- (R) and TP- (X) on the DEF/POWER

Board with a jumper wire.

Raster and sound will disappear.

3. The receiver must remain in this state even after removing the jumper wire. This is the evidence that the FS circuit is functioning properly.

4. To obtain a picture again, temporarily turn the receiver off and allow the FS circuit more than 5 seconds to reset. Then turn the receiver on to produce a normal picture.

Troubleshooting Guide for Fail Safe Circuit

Check that the set returns to normal operation when pin 12 of Z801 is grounded with jumper wire.

YES NO

Check the voltage across

Capacitor C419 is approximately ( C) volts.

Refer to table –3 for fall safe voltage ( C) .

YES

Faulty power circuit or horizontal circuit.

(See SETTING & ADJUSTING

DATA on page 19)

ANODE VOLTAGE MEASURING METHOD

CAUTION: Take extra precaution when measuring this high voltage. High voltages are also present in surrounding circuit boards (CRT DRIVE assembly, DEFLECTION assembly, and POWER

SUPPLY assembly).

1. Disconnect the FBT anode cable as outlined below. Measure high voltage at the point where the cable enters the

FBT.

2. Holding the rubber cover firmly, turn it counterclockwise and check that the lock has been disengaged. (See Fig. b on page 9.)

3. Determine the extent of the rubber cover before disconnecting the cable.

4. Pull straight up the anode cable to disconnect.

5. When reconnecting the cable, proceed in the reverse order.

After reconnecting, tug on the cable to check that it is secure.

Defective Fail Safe Circuit

NO

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