Question about Hitachi 43UWX10B 43" Rear Projection Television
Here it goes... the same problem with power coming on. 2 flashing green leds 1 red led that (pulses with the 2 green, doesn't completely go out). Three main tube fuses are good. I took the boards out looked underneath checking for cracks in solder, didn't see anything. Have heard about checkin c702 (seems ok) and E994(can't find that). checked them. Relay works. But anyway had it all apart. Put it back together turned it on. Taaadaaa it worked. but the picture had a real bad problem with red.... so i was starting to try and diagnose the alignment issue....(about 20 minutes)... then the tv shut off again... and back to the same problem as before. Almost... Brought my DVM home from work but not exactly sure how to hook up to test for dc voltage on a circuit board . Please help... I work on trucks.. so i have some electrical exp but could use a little help with circuit boards and such.
Sounds like you are on the right track in troubleshooting, but for this set there are a few things that would baffle most techs. Like in your case it could be as simple as redressing you auto link and 4 event timer cable. There is a problem in this set when the Cabling from the front control panel is too close to the Blue CRT-yoke HV lead. Redressing this may solve your problem. For more info on this ctechnicians.com
Posted on Jan 06, 2008
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Posted on Jan 02, 2017
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READING CODES Modes will not switch while the engine is running. The ECM automatically switches to MODE I when the ignition is switchedOFF.
1984-90 Vehicles With Dual LED System
The self-diagnostic system has 5 modes. To switch modes, switch the ignition ON and use a screwdriver to turn the mode select switch through the access port on the ECM. The inspection lights will begin to flash. When the desired mode has been entered, turn the screwdriver fully counterclockwise. The red LED and green LED perform different functions in different modes.
This is the normal vehicle operating mode. The green LED will indicate loop status. If the green LED is not blinking when the engine is running, the vehicle is in open loop, or the HO 2 S, O 2 S, or sensor circuit has a malfunction. If the green LED is blinking, the vehicle is in closed loop. If a malfunction takes place, the red LED and the MIL will glow, indicating a malfunction has occurred.
Both the red LED and green LED are used to monitor mixture ratio feedback control. The green LED will function as described in MODE I. If vehicle is in open loop, the red LED and green LED will remain on or off. In order for results to be valid, vehicle must be in closed loop. In closed loop, the red LED remains off if the system is running rich, comes on if the system is running lean, and blinks at the same time with the green LED if system is within 5% of the exact air/fuel ratio.
-When this mode is accessed, the codes stored in the ECM's memory will be flashed by the green LED and red LED on the side of the ECM. The red LED will light first. This is the first digit of the trouble code; the green LED will flash next, showing the second digit of the code. For example: 2 flashes of the red LED followed by 1 flash of the green LED corresponds to Code 21.
This mode is used for checking the throttle plate (TP) switch, starter, and vehicle speed switch status. When the TP switch or starter switch is activated, the red LED will briefly flash as the status changes. For VSS status, the green LED will remain off when vehicle speed is less than 12 mph (19 km/h) and come on when vehicle speed is greater than 12 mph (19 km/h).
This mode represents a real-time diagnostic test of the crank angle sensor, ignition signal and the mass airflow signal. The malfunction code will be displayed only when the malfunction occurs and will not be stored in memory. The output code will appear as a single or short string of pulses. Count the number of pulses for the malfunction code.
1 pulse-CMP sensor signal lost or noise in signal 2 pulses-MAF Sensor signal abnormal 3 pulses-Fuel pump circuit shorted or open 4 pulses-Ignition signal lost
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