Panasonic TC-51P280G rear projection high-definition color Diantong boot screen very unstable failure repair method |
| Time£º2014-07-10 08:39:47 Source£ºNetwork Author£ºUnknown Clicks£º1287 |
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eSgservice manual download site
eSgservice manual download site
When + 140 v voltage drop, voltage regulator control process is the opposite of the process. eSgservice manual download site
eSgservice manual download site
Photoelectric coupler D807 the light-emitting diode current decreases, and light pipe set, shoot and internal resistance increases, IC801 internal C4 charging slow, field effect switch tube conduction time extended, P1 and P2 T801 main winding stored energy increases, + 140 v up to the set value, has reached the purpose of stable + 140 v voltage. Check the relevant parts of the voltage regulator control circuit, found no significant problems, check the capacitance C854 is good, the bad suspected photoelectric coupler D807 has a problem, the welding circuit under test, found that the internal photoconductive tube sets, and positive and reverse resistance are about 2 m Ω, judgment on photosensitive coupler for this failure, after replacing D807, troubleshooting.eSgservice manual download site
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