Safety Protection - Compal ACY25 series Service Manual

Output Connector:
CN2: JST_SM02B_BHSS-1
Pin No.
1
2
Note : Please mark " CAUTION HIGH VOLTAGE" around CN2

Safety Protection

Open lamp protection:
When inverter is on open lamp status, any component on inverter should be O.K and inverter
is no damaged, no fire and no arcing. If inverter can't shunt down during open lamp happen,
inverter must pass below conditions:
Human body test.
Open lamp burning: Inverter burns for 24 hours at open lamp status. No parts damage.
Human body safety test:
Short inverter output, transformer secondary output to GND by a 2K
one end to GND and another one to those outputs. They should meet output current limitation
requirement as follow. Output current I is the current that flows through 2K
Output current I ≦ 0.7mA , if frequency f ≦ 1KHz
Output current I ≦ 0.7mA * f (kHz) , if f ≧ 1KHz.
However, output current should be less than 70mA even frequency is more than 100KHz.
Abnormal test:
Any one component is short or open; inverter should be no fire, no arcing. And result must
meet output current limitation requirement.
Chapter 4-10
Symbol
HV Connected to high voltage of LCD lamp
LV Connected to low voltage of LCD lamp
Description
Ω
resistor which connects
Ω
resistor.