LED 灯珠 / 背光维修
LED bead / backlight repair
核心特点
Core features
- 双数显：电压、电流同步读取，低压段测量精度可达 0.01V
- 可调输出：旋钮调压 + 四档电流/亮度，自动适应灯珠与灯板电压
- HI / LO 模式：自动最大电流或手动微调，适配大功率点灯与长时间微亮作业
- 漏电检测：配合漏电夹与声音报警，排查灯盘/灯箱隐患
- 声音提示：导通响一声，异常无声，漏电多声报警，减少盯屏疲劳
- 保护设计：电路保护不易烧灯；电气隔离下单触一极更安全，仍严禁同时触碰正负极
- Dual meters: read V and mA together; low-range voltage accuracy down to 0.01V
- Adjustable output: voltage knob + 4-step current/brightness; auto-matches bead/panel voltage
- HI / LO modes: auto max current or manual fine control for high-power lighting vs long micro-bright work
- Leakage check: clip + alarm tones help find panel/box leakage
- Audio cues: one beep for conduction, silence for bad beads, multi-beep for leakage
- Protection: circuit protection helps avoid burning beads; never touch both poles at once
产品多视角
Product views
典型应用
Typical uses
- LED 电视背光免拆屏点灯与故障排查
- 单颗灯珠、灯条、灯板与灯盘导通检测
- 维修台长时间点亮：可用 LO 模式把亮度调到微亮，减轻刺眼
- 约百串级不同类型灯条/灯板的维修台面作业（以实际负载为准）
- TV backlight lighting and troubleshooting without full panel teardown
- Single beads, strips, boards and panels continuity checks
- Long bench sessions: LO mode for micro-bright output that is easier on the eyes
- Around ~100-string class strip/board work on the bench (confirm actual load)
面板与接口
Panel and terminals
- 输出电压调节：左上旋钮，连续调节输出电压
- 输出电流 / 亮度：左下拨档，1～4 档由低到高
- 灯珠电压表：中部上方数码显示，单位 V
- 灯珠电流表：中部下方数码显示，单位 mA
- 输出正极（红）：接红表笔
- 输出负极（黑）：接黑表笔
- 检测漏电（红）：接鳄鱼夹，夹灯盘金属处
- 电源开关：机身顶部，靠近电源线入口
- Control output voltage: top-left knob, continuous adjustment
- Output current / brightness: 4-step switch, low to high
- Voltage meter: upper digital display, in V
- Current meter: lower digital display, in mA
- Positive output (red): red probe
- Negative output (black): black probe
- Leakage detection (red): alligator clip to panel metal
- Power switch: on top, near the cord inlet
关键规格（说明书摘录）
Key specs (from manual)
| 型号Model | CB250 |
|---|---|
| 供电Supply | AC 220V / 50Hz |
| 输出电压Output voltage | 约 DC 0~240V（量产面板常见标注 0~230V，以实物面板与说明书为准） Approx. DC 0~240V (panel print may show 0~230V; follow unit + manual) |
| 输出电流Output current | DC 0~25mA（4 steps） |
| 显示Display | 双数码：灯珠电压 V / 灯珠电流 mA Dual meters: voltage (V) / current (mA) |
| 电压测量精度Voltage accuracy | 0~25V：0.01V；25~250V：1V 0~25V: 0.01V; 25~250V: 1V |
| 隔离Isolation | 半隔离（单触一极更安全；严禁同时触摸正负极） Half-isolated (safer on one pole; never touch both poles) |
| 特色功能Highlights | 漏电检测、声音提示、HI/LO 电流模式切换 Leakage check, audio cues, HI/LO current mode switch |
规格用于选型沟通；正式下单与现场使用请以随货说明书及量产面板标注为准。
Specs are for selection talks; follow the shipped manual and the panel print on your unit.
使用要点
How it works
用红黑表笔触碰灯珠或灯盘两端即可点亮；旋转电压旋钮调节输出电压，拨动电流档调节输出电流与亮度。电流档对应的实际电流会因负载不同而有差异。
Touch the bead or panel ends with the red/black probes to light it. Use the voltage knob and the 4-step current switch to set output; actual current at each step varies with the load.
声音提示
Audio cues
- 「Bi~」一声：灯珠导通正常，可减少盯屏
- 无鸣声：灯珠可能异常
- 连续报警音：灯盘存在漏电隐患，可用排除法定位
- Single “Bi~”: conduction OK — less need to stare at the board
- No beep: bead may be faulty
- Alarm tones: panel leakage risk — isolate by elimination
漏电检测
Leakage check
将「检测漏电」端线夹夹在灯盘金属处，再正常点亮灯珠：一声「Bi~」表示正常；「Bi Bi Bi」报警表示存在漏电隐患，应尽快排查。
Clip the leakage lead to the panel metal, then light the bead as usual: one beep means OK; multi-beep alarm means leakage risk — locate it promptly.
查看漏电检测步骤 View leakage check steps
切换 HI / LO 电流模式
Switch HI / LO current mode
- 将电压旋到最大，电流档拨到第 4 档（最大）
- 短接正负输出表笔约 5 秒
- 电流表显示 HI：自动最大电流模式（出厂默认，适合大功率灯珠）
- 电流表显示 LO：手动调节模式，电流随电位器变化，可把灯珠调到微亮
- Set voltage to max and current switch to step 4
- Short the output probes for about 5 seconds
- HI: auto max-current mode (factory default, high-power beads)
- LO: manual mode — current follows the pot for micro-bright output
同系列选型对照（说明书型号对比表）
Model comparison (from manual)
| 型号Model | 输出电压Output V | 输出电流Output I | 调压方式Voltage control | 隔离Isolation | 表头Meters | 电压精度V accuracy | 漏电检测Leakage |
|---|---|---|---|---|---|---|---|
| CB250 | 0-250V | 0-20mA | 旋转调压Knob | 半隔离Half | 电压 + 电流V + I | 0.01V | 有Yes |
| CA250 | 0-250V | 0-20mA | 旋转调压Knob | 半隔离Half | 电压V | 0.2V | 无No |
| CF300 | 0-300V | 0-300mA | 两档电压Two ranges | 双重隔离Double | 电压 + 电流V + I | 0.2V | 无No |
| CL300 | 0-320V | 0-40mA | 否No | 全隔离Full | 电压V | 0.01V | 无No |
| MCX300 | 0-320V | 0-40mA | 否No | 全隔离Full | 电压 + 电流V + I | 0.01V | 无No |
| MCT220 | 0-220V | 0-15mA | 按键调压Buttons | 半隔离Half | 电压V | 0.1V | 无No |
对比数据摘自说明书型号对比表；CB250 的差异点是双表头 + 0.01V 级精度 + 漏电检测。个别型号供货状态请与销售确认。
Comparison from the manual table; CB250 stands out with dual meters, 0.01V-class accuracy and leakage detection. Check availability with sales.
随机配件
Included accessories
配件以实际包装清单为准；表笔为细针尖设计，便于点测密排灯珠。
Accessories follow the actual packing list; fine-tip probes suit densely packed beads.
批量包装与出货
Bulk packing
- 常规装箱：50 pcs / 箱
- 普通包装（无彩盒）外箱约 30 × 39 × 53 cm，整箱约 12.6 kg
- 加纸盒包装外箱约 59 × 45 × 41 cm，整箱约 15.4～16.1 kg
- 实际箱规与重量按订单配置确认，可按需调整装箱数量
- Standard carton: 50 pcs
- Plain packing: carton approx. 30 × 39 × 53 cm, about 12.6 kg
- With gift box: carton approx. 59 × 45 × 41 cm, about 15.4–16.1 kg
- Final carton size and weight follow your order configuration
套装与安全
Kit and safety
- 主机、红黑表笔、漏电测试夹等（以实际包装为准）
- 长时间使用可能轻微发热，属正常；建议约每 2 小时断电休息约 5 分钟
- 警告：请勿双手同时触摸输出正负两极，防止触电
- Host unit, red/black probes, leakage clip and more (confirm packing list)
- Mild warmth in long use is normal; pause ~5 minutes every ~2 hours
- Warning: never touch both output poles at the same time
相关型号
Related models
同系列选型时可对照：CA250 偏经典黄机单表头；CF300 更大电流功率；CX300「小云」便携缓升输出。
Compare within the LED tester line: CA250 classic yellow single-meter; CF300 higher current; CX300 portable soft-ramp helper.