#Chinatv
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- čas přidán 11. 09. 2024
- CHINA TV 17"NORMAL PCB
MAIN IC 8895CSNG 7GG9
EHT BSC25-T1010A (T1719A)
VERTICAL IC LA78040
SOUND IC TDA2003
TRANSISTOR POWER SUPPLY
HORIZONTAL LINE
1.Power on/Measure vertical IC voltage----not ok.
2.Power off/Open main ic vertical drive resister (pin 16).
3.Power on/Touch of resister one point by tweezers-----H LINE spread top to bottom-----that means vertical IC ok.
4.Check +5V(pin 36 of main IC)----ok.
5.Check +8V (pin17 of main IC)---ok.
6.Check vertical drive voltage---low.
7.Check voltage pin15 of main IC----missing.
8.Power off/Open capacitor C216(104J) pin15 of main IC.
9.Measure capacitor----shows--value low.
10.Set new capacitor.
11.Then-----