This receiver incorporates a new auto-diagnosis feature.
With this new feature will be easier for the repair technician to detect the
failures. There is a LED located on the A-Board by the DG-Board, this LED will start
flashing when a failure is detected by the circuits located in a specific area,
depending on how many times the LED is flashing, this will tell you what
circuit should be checked.
LED LOCATION
SOS of diagnosis LED
NUMBER
OF FLASHES
|
POSSIBLE
CIRCUIT
|
1
|
+140 (POWER)
|
2
|
LOW DC (+B)
|
4
|
HHS (HIGH VOLTAGE)
|
5
|
IC4511
|
6
|
IC4518
|
DIS-ASSEMBLY FOR SERVICE
BACK COVER
- Remove all the screws marked with an arrow [ ß ] from the back of the receiver. 4 screws at the top edge of the receiver. 3 screw by the A/V jacks.
- 1 screw by the RF jacks.
- 1 screw at each lower corner of the receiver.
- 1 screw by the retainer plate of the AC power cord.
- 1 screw at each lower side of the receiver.
- 1screw below the A/V jacks
- Extensions for board connectors may be needed to test voltages on P-Board.
A-BOARD REMOVAL
- The DG-Board is assembled on the main chassis (A-Board). The A-Board assembly rest on a chassis tray along with the D-Board. Slide chassis tray out. Gently lift, tray and pull out. Disconnect plug connectors; release wire ties and holders as required for complete chassis removal.
[2] The D-Board is secured to the chassis tray
with three screws
[3] The A-Board is mated to the D-Board by four flexible
connectors: A4, A5, A6 & A7 (D4, D5, D6 & D7 on the D-Board,
respectively).
- To remove either boards, unplug the connectors on the A-Board.
- Some tie-wraps that secure the wire dressings may need to be unfastened for chassis removal.
D-BOARD GROUND CONNECTOR
- To release the GND cable from D13 connector insert a wire in both cavities of connector, then pull up the cable.
L-BOARD [CRT OUTPUT]
- Plugs into the socket on the CRT neck.
- To remove this board, first unplug the board from the CRT neck, then disconnect L1, L2 and L3 connectors, to disconnect the focus F1(red cable) & F2 (white cable) cables, pull the tab and release the cables, finally disconnect the screen cable from the D-Board D16 (screen and heater).
- To reinsert back the cables, remember the original position of cables, F1 (red cable) goes to A on the CRT socket and F2 (white cable) goes to B on the CRT socket.
- To release screen GND cables from L-Board L11 & L12 connectors, insert a wire in both sides of connector and pull upwards the cable, then remove the wire.
DG-BOARD
- Plugs onto the A-Board at the A21, A22 and A23 (DG21, DG22 and DG23 respectively) connectors.
- This board is not-serviceable. When removing this board pull carefully.
P-BOARD
- Plugs onto the right side of the D-Board at D3, D2, D11 & D12 connectors (P3, P2, P11 & P12 on P-Board, respectively); First remove the three screws that holds the metal board, one from the flyback and two from the chassis tray and then use a flat head screwdriver to release the connector locking tabs and pull upwards the board.
G-BOARD
- Mated to A-Board by three flexible connectors (A1, A2, A3) and D-Board by one flexible connector (D40). To remove this board, first unplug the four flexible connectors, then RT4 and G4 connectors, then pull upwards the board while unlock the tabs from the chassis tray.
K-BOARD
- Is fastened to the G-Board by two metal brackets that are secured by a screw (each one). Plugs into the front of G-Board by connector K1 to G6,and is fastened to the chassis tray assembly by 2 screws on each lower corner.
SPEAKERS
- Each speaker is secured to a plastic base with 4 screws, and each plastic base is secured to a second base with two screws, and assembled to the cabinet with two screws. The subwoofer speaker is assembled within the back cover of the television set by 4 screws.
- Be sure to reconnect the speaker wires to the correct speaker lead (+) (-)
- IMPORTANT: Since two different versions of DG-boards are available for the CT-36HL42 models, please check board number printed on the lower right corner when replacing DG-Board. Refer to label on chassis for EEPROM part number that is used.
- The DG-Board (TNPA2345 or TNPA2345AC) is non-serviceable. If this board is defective replace it with a new one. Each version of DG-Board must be matched with correct version of EEPROM. Confirm the EEPROM part number before replacing.
- When ordering any board, add and ” S” after the board suffix application.
- Example: If ordering D-Board, should be ordered as: TNPH0466S.
