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7 Block Diagrams
7-3 IP Board Part (SMPS Part)
7-3
7 Block Diagrams
7-4 IP Board Part (Inverter Part)
7-4
13 Circuit Descriptions

13-1-3 IP BOARD BLOCK(POWER) Parts




13-1-4 IP BOARD BLOCK( INVERTER ) Parts




13-3
13 Circuit Descriptions

13-1-5 IP BOARD(inverter) PROTECTION Parts
PROTECTION Parts


- PROTECTION Parts are divided two parts. When lamp voltage rose as absurd and lamp feedback electric
current would not be sensed. So all of the two halt IP-Board's function that prevent action the enemy more
than IP-Board's continous abnormality action.
- When Trans output voltage rose as absurd, become OVP and halts IP-board's function because the
divided voltage is inputted by IC(U201) 2 PIN.
- When lamp current is sensed, become OLP and halts IC because the IC(U201) 2 PIN is became
under 2.5V




13-4
13 Circuit Descriptions

13-2 Trouble Shooting
13-2-1 IP BOARD(Power)



Power On




No
Check Fuse (F101)



Yes

Change FUSE
IC101 Vst-Pin
No (Norma:High)
No

Check the short of AC part or Check the IC
Yes
IC101 D-pin


IC101 Vcc-Pin
No (Normal:9~16V)
No

Check the 13V output part Check the Vcc part
open Yes


IC101 D-Pin
(Normal:Switching)
No


Yes Check the Switching part



Output 13V
No (Normal:12~14V)
No

Check the protection system Yes Check the feedback system


Inlet/Output
Harness
No


Yes Check the Pin or wire
connection

Check others Harness, Inlet




13-5
13 Circuit Descriptions

13-2-1 IP BOARD(Inverter)




Power On




Check the 13V line
No

Yes Check the Adapter system



16Pin
(Normal:5Vtyp.)
No


Yes Check the Input Circuit


Control IC is
(Pin 12, 13 : chopping wave
Pin 8, 9 : square wave) No


Yes Check the Control IC & IC
Driver

Inverter Trans
No (Pin8,9 : square wave)
No

Check the Protection Circuit Yes Check the Half-bridge part



Output Current
No (Normal Output)
No

Check the Dimming Circuit Check the Feedback Circuit
Yes


Check others Harness, Inlet




13-6
13 Circuit Descriptions
13-3 IP BOARD(Power) Schematic Diagrams
13-7
13 Circuit Descriptions
13-4 IP BOARD(Inverter) Schematic Diagrams
13-8