#Chinatv 

CHINA TV 14"NORMAL PCB
MAIN IC 8873CSCNG 6PR6
EHT BSC25-T1010A
VERTICAL IC LA78040
SOUND IC TDA2003
TRANSISTOR POWER SUPPLY
LOW POWER
1.Power on/Moves EHT screen pot.-----then tv screen hight and width problem.
2.Measure EHT supply voltage---low.
3.Power off/open EHT supply voltage jumper.
4.Power on/again measure EHT supply voltage---ok.
5.Power off/Add 100w lamp at supply voltage.
6.Power on/Lamp not glowing and voltage drops.
7.Power off/Measure transistor C3807---ok.
8.Measure transistor C764----ok.
9.Measure transistor C1815----ok.
10.Measure Optocupler-----ok.
11.Open transistor one by one.
12.Open transistor C3807------measure------ok.
13.Suspect transistor C3807 will be defective.
14.Set new transistor.
15.Then-----