Рет қаралды 42,139
LG TV 21"NORMAL PCB
MAIN IC TDA12135PS/N3/3/AL6
EHT BSC25-N1682
VERTICAL IC TDA4865
SOUND IC TDA7297
AV IC LA7958N
STR W6554A
POWER PROBLEM
1.Power on/Check eht supply voltage-----charge---discharge.
2.Power off/Open eht supply voltage jumper.
3.Power on/Again check eht supply voltage-----same problem.
4.Power off/Add 100W lamp(eht supply).
5.Power on/Lamp & led glowing-----eht supply voltage ok.
6.Power off/Add eht supply voltage jumper.
7.Power on/Lamp & led glowing and tv is running.
8.Again check eht supply voltage----ok.
9.Power off and open lamp.Problem power supply.
10.Open register R818(91K) one lid.
11.Measure register R818(91K)-------ok.
12.Measure register R815(91K)-------ok.
13.Measure register R817(27K)-------ok.
14.Resolder the register R818(91K).
15.Next open opto cupler.
16.Set new opto cupler.
17.Power on/Led glowing------tv running---check eht supply voltage---ok.
18.Check 9V reg. output voltage------ok.
19.Check 3.3V reg. output voltage-----ok.
20.Check 5V reg. output voltage----ok.
21.Check vertical supply voltage----ok.
22.Check video output supply voltage----ok.
23.Problem is solve.